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Öberg J, Jorde R, Almås B, Nielsen CS, Gerds TA, Cashman KD, Grimnes G. Vitamin D Status During Adolescence and the Impact of Lifestyle Changes: 2 Years' Follow-up From the Fit Futures Study. J Clin Endocrinol Metab 2024; 109:e1029-e1039. [PMID: 37955862 PMCID: PMC10876399 DOI: 10.1210/clinem/dgad655] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 06/29/2023] [Accepted: 11/09/2023] [Indexed: 11/14/2023]
Abstract
CONTEXT Longitudinal data regarding vitamin D status in adolescence is scarce. This study presents population-based data from an Arctic adolescent population (n = 589) at 16 and 18 years. OBJECTIVE The aims of this study were to investigate changes in vitamin D status during 2 years in adolescence, and whether lifestyle changes were associated with serum 25-hydroxyvitamin D (s-25(OH)D) at follow-up. METHODS Fit Futures is a longitudinal study at 69°N in Norway. Participants had their s-25(OH)D levels analyzed in their first and third year of upper secondary school (median age 16 and 18 years), in Fit Futures 1 (FF1) and Fit Futures 2 (FF2), respectively. Self-reported lifestyle habits were registered through questionnaires. The association between lifestyle changes and s-25(OH)D levels at follow-up were calculated by regression analyses, controlling for baseline s-25(OH)D levels. RESULTS Longitudinal data were available for 309 girls and 280 boys. The proportion of adolescents with s-25(OH)D <50 nmol/L were 73.7% in FF1 and 77.1% in FF2, while the proportion <30 nmol/L constituted 35.7% in FF1 and 40.9% in FF2. Of those with s-25(OH)D <30 nmol/L (severe vitamin D deficiency) in FF1, 73.3% remained severely deficient in FF2. Among boys, an increase in UV exposure was significantly associated with higher s-25(OH)D levels in FF2 (beta; CI [nmol/L] 12.9; 9.1, 16.7). In girls, decreased vitamin/mineral supplement intake was significantly associated with lower s-25(OH)D at FF2 (-6.7; -10.2, -3.1), while increased UV (10.8; 7.0, 14.7) and combined hormonal contraceptive exposure (12.1; 6.0, 18.1) in FF2 was significantly associated with higher s-25(OH)D levels in FF2. CONCLUSION Severe vitamin D deficiency was prevalent throughout adolescence. Lifestyle changes may alter s-25(OH)D levels in this age group.
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Affiliation(s)
- Johanna Öberg
- Tromsø Endocrine Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, N-9037 Tromsø, Norway
| | - Rolf Jorde
- Tromsø Endocrine Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, N-9037 Tromsø, Norway
| | - Bjørg Almås
- Haukeland University Hospital, The Hormone Laboratory, N-5021 Bergen, Norway
| | - Christopher Sivert Nielsen
- Department of Chronic Diseases, Norwegian Institute of Public Health, N-0213 Oslo, Norway
- Department of Pain Management and Research, Oslo University Hospital, N-0318 Oslo, Norway
| | | | - Kevin D Cashman
- Cork Centre for Vitamin D and Nutrition Research, School of Food and Nutritional Sciences, University College Cork, Cork, Ireland
| | - Guri Grimnes
- Tromsø Endocrine Research Group, Department of Clinical Medicine, UiT The Arctic University of Norway, N-9037 Tromsø, Norway
- Division of Internal Medicine, University Hospital of North Norway, N-9038 Tromsø, Norway
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Kallioğlu MA, Sharma A, Kallioğlu A, Kumar S, Khargotra R, Singh T. UV index-based model for predicting synthesis of (pre-)vitamin D3 in the mediterranean basin. Sci Rep 2024; 14:3541. [PMID: 38347060 PMCID: PMC10861575 DOI: 10.1038/s41598-024-54188-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2023] [Accepted: 02/09/2024] [Indexed: 02/15/2024] Open
Abstract
The importance of solar radiation for the body's ability to synthesize Vitamin D3 is well documented, yet the precise amount of sun exposure required to avoid Vitamin D insufficiency is less clear. To address this knowledge gap, this study sought to utilize the sun in a suitable period at the optimum dose by utilizing numerical simulations to determine the amount of Vitamin D3 synthesis in the skin according to season, time of day, and geographical location in Turkey. The study was carried out in three stages; in the first stage, daily, monthly, and annual values were determined in cases where the solar zenith angle has the active UV-B wavelength. The second stage determined the level of Vitamin D that can be synthesized in all skin types at 25% solar radiation exposure. In the third stage, the sun exposure time required for 1000 International Units (IU) for all skin types was calculated. According to the analysis, the yearly period of active synthesis of D3 on Earth lasts from the beginning of March to the third week of October. During the day, it is between 10:00 and 16:00. For 1000 IU/day, the average annual estimated times (minutes) are 5.05 for Type I, 6.3 for Type II, 7.6 for Type III, 11.35 for Type IV, 15.15 for Type V, and 25.25 for Type VI. The results of this paper will impact awareness for academic-medical users.
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Affiliation(s)
| | - Ashutosh Sharma
- College of Science and Engineering, James Cook University, Townsville, QLD, 4810, Australia
| | - Ayşan Kallioğlu
- Department of Neurology, Faculty of Medicine, Cigli Research and Training Hospital, Izmir Bakırçay University, 8780, Çiğli - İzmir, Turkey
| | - Sunil Kumar
- Department of Nanotechnology and Advanced Materials Engineering and HMC, Sejong University, Seoul, 05006, South Korea
| | - Rohit Khargotra
- Institute of Materials Engineering, Faculty of Engineering, Pannonia University, Veszprem, 8200, Hungary.
- Sustainability Solutions Research Lab, University of Pannonia, Egyetem u. 10., Veszprém, 8200, Hungary.
| | - Tej Singh
- Savaria Institute of Technology, Faculty of Informatics, ELTE Eötvös Loránd University, Budapest, Budapest, 1117, Hungary
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Turck D, Bohn T, Castenmiller J, de Henauw S, Hirsch‐Ernst K, Knutsen HK, Maciuk A, Mangelsdorf I, McArdle HJ, Pentieva K, Siani A, Thies F, Tsabouri S, Vinceti M, Lanham‐New S, Passeri G, Craciun I, Fabiani L, De Sousa RF, Martino L, Martínez SV, Naska A. Scientific opinion on the tolerable upper intake level for vitamin D, including the derivation of a conversion factor for calcidiol monohydrate. EFSA J 2023; 21:e08145. [PMID: 37560437 PMCID: PMC10407748 DOI: 10.2903/j.efsa.2023.8145] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023] Open
Abstract
Following two requests from the European Commission (EC), the EFSA Panel on Nutrition, Novel Foods and Food Allergens (NDA) was asked to deliver a scientific opinion on the revision of the tolerable upper intake level (UL) for vitamin D and to propose a conversion factor (CF) for calcidiol monohydrate into vitamin D3 for labelling purposes. Vitamin D refers to ergocalciferol (vitamin D2), cholecalciferol (vitamin D3), and calcidiol monohydrate. Systematic reviews of the literature were conducted to assess the relative bioavailability of calcidiol monohydrate versus vitamin D3 on serum 25(OH)D concentrations, and for priority adverse health effects of excess vitamin D intake, namely persistent hypercalcaemia/hypercalciuria and endpoints related to musculoskeletal health (i.e. falls, bone fractures, bone mass/density and indices thereof). Based on the available evidence, the Panel proposes a CF for calcidiol monohydrates of 2.5 for labelling purposes. Persistent hypercalciuria, which may be an earlier sign of excess vitamin D than persistent hypercalcaemia, is selected as the critical endpoint on which to base the UL for vitamin D. A lowest-observed-adverse-effect-level (LOAEL) of 250 μg/day is identified from two randomised controlled trials in humans, to which an uncertainty factor of 2.5 is applied to account for the absence of a no-observed-adverse-effect-level (NOAEL). A UL of 100 μg vitamin D equivalents (VDE)/day is established for adults (including pregnant and lactating women) and for adolescents aged 11-17 years, as there is no reason to believe that adolescents in the phase of rapid bone formation and growth have a lower tolerance for vitamin D compared to adults. For children aged 1-10 years, a UL of 50 μg VDE/day is established by considering their smaller body size. Based on available intake data, European populations are unlikely to exceed the UL, except for regular users of food supplements containing high doses of vitamin D.
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Dosi MCM, Riggs CM, May J, Lee A, Cillan-Garcia E, Pagan J, McGorum BC. Thoroughbred Racehorses in Hong Kong Require Vitamin D Supplementation to Mitigate the Risk of Low Vitamin D Status. Animals (Basel) 2023; 13:2145. [PMID: 37443942 DOI: 10.3390/ani13132145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/20/2023] [Accepted: 06/27/2023] [Indexed: 07/15/2023] Open
Abstract
There is a paucity of data relating to the vitamin D status of racehorses. We hypothesised that the management of racehorses in Hong Kong (HK) predisposes to low vitamin D status unless they receive dietary supplementation. Serum concentrations of 25-hydroxyvitamin D2 (25OHD2), 25-hydroxyvitamin D3 (25OHD3) and total 25-hydroxyvitamin D (total 25OHD) for 79 non-grazing HK racehorses were compared with those for 22 racehorses training in the United Kingdom (UK) that grazed for ≥1 h/d, and for which published data exists. A nested group of 41 HK horses was sampled twice to determine the effect of the duration in HK on vitamin D status. The HK horses had significantly lower serum concentrations of total 25OHD and 25OHD2 than the UK horses; 25OHD2 was undetectable in 15/79 HK sera and serum concentrations of 25OHD2 declined with the duration in HK. The main determinants of vitamin D status were assessed using linear regression; the retained variables were the 25OHD3 concentration and the duration in HK. The inverse relationship between the serum concentrations of 25OHD2 and 25OHD3, previously identified in humans, was observed for the first time in horses. In conclusion, HK racehorses have low serum 25OHD2 and total 25OHD concentrations and rely on D3 supplementation to maintain adequate vitamin D status. Further study is required to determine the optimal form of dietary vitamin D supplementation for Thoroughbred racehorses.
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Affiliation(s)
- Miranda C M Dosi
- Royal (Dick) School of Veterinary Studies and The Roslin Institute, University of Edinburgh, Easter Bush Campus, Roslin EH25 9RG, UK
| | - Chris M Riggs
- The Hong Kong Jockey Club Equine Welfare Research Foundation, Sha Tin Racecourse, New Territories, Hong Kong SAR, China
| | - Jessica May
- The Hong Kong Jockey Club Equine Welfare Research Foundation, Sha Tin Racecourse, New Territories, Hong Kong SAR, China
| | - Adele Lee
- The Hong Kong Jockey Club Equine Welfare Research Foundation, Sha Tin Racecourse, New Territories, Hong Kong SAR, China
| | - Eugenio Cillan-Garcia
- Royal (Dick) School of Veterinary Studies and The Roslin Institute, University of Edinburgh, Easter Bush Campus, Roslin EH25 9RG, UK
| | - Joe Pagan
- Kentucky Equine Research, Versailles, KY 40383, USA
| | - Bruce C McGorum
- Royal (Dick) School of Veterinary Studies and The Roslin Institute, University of Edinburgh, Easter Bush Campus, Roslin EH25 9RG, UK
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Sanford BS, Aliano JL, Omary CS, McDonnell SL, Kimball SM, Grant WB. Exposure to a Vitamin D Best Practices Toolkit, Model, and E-Tools Increases Knowledge, Confidence, and the Translation of Research to Public Health and Practice. Nutrients 2023; 15:nu15112446. [PMID: 37299409 DOI: 10.3390/nu15112446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/10/2023] [Accepted: 05/15/2023] [Indexed: 06/12/2023] Open
Abstract
Preventable vitamin D deficiency (VDD) is a global health concern. The prevention, early detection, and treatment of vitamin D deficiency aligning with serum 25-hydroxyvitamin D concentration recommendations of 40-60 ng/mL (100-150 nmol/L), provided by an international panel of 48 vitamin D researchers, would result in significant health benefits and cost savings to individuals and society. However, research shows that healthcare professionals lack knowledge and confidence in best practices with respect to vitamin D. A vitamin D toolkit was developed that included a model for decision-making support, e-tools, and accompanying resources and was implemented using an online, asynchronous learning management system. This pre-test, post-test, and follow-up survey study design aimed to increase nurses' and dietitians' levels of knowledge and confidence regarding vitamin D, aid in their translation of evidence into spheres of practice and influence, and help them identify translation barriers. The completion of the toolkit increased the participants' (n = 119) knowledge from 31% to 65% (p < 0.001) and their confidence from 2.0 to 3.3 (p < 0.001) on a scale of 1-5. Respondents reported using the model (100%) as a framework to successfully guide the translation of vitamin D knowledge into their sphere of influence or practice (94%) and identifying translation barriers. The toolkit should be included in interdisciplinary continuing education, research/quality improvement initiatives, healthcare policy, and institutions of higher learning to increase the movement of research into practice.
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Affiliation(s)
- Beth S Sanford
- School of Nursing, Rasmussen University, 4012 19th Avenue South, Fargo, ND 58103, USA
| | - Jennifer L Aliano
- GrassrootsHealth Nutrient Research Institute, Encinitas, CA 92024, USA
| | - Courtney S Omary
- School of Nursing, Rasmussen University, 4012 19th Avenue South, Fargo, ND 58103, USA
| | | | | | - William B Grant
- Sunlight, Nutrition, and Health Research Center, San Francisco, CA 94164-1603, USA
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Della Nera G, Sabatino L, Gaggini M, Gorini F, Vassalle C. Vitamin D Determinants, Status, and Antioxidant/Anti-inflammatory-Related Effects in Cardiovascular Risk and Disease: Not the Last Word in the Controversy. Antioxidants (Basel) 2023; 12:antiox12040948. [PMID: 37107323 PMCID: PMC10135791 DOI: 10.3390/antiox12040948] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2023] [Revised: 04/14/2023] [Accepted: 04/15/2023] [Indexed: 04/29/2023] Open
Abstract
Beyond its key role in calcium homeostasis, vitamin D has been found to significantly affect the cardiovascular (CV) system. In fact, low vitamin D levels have been associated with increased CV risk, as well as increased CV morbidity and mortality. The majority of effects of this molecule are related directly or indirectly to its antioxidative and anti-inflammatory properties. Generally, vitamin D insufficiency is considered for 25-hydroxyvitamin D (25(OH)D) levels between 21-29 ng/mL (corresponding to 52.5-72.5 nmol/L), deficiency as 25(OH)D levels less than 20 ng/mL (<50 nmol/L), and extreme deficiency as 25(OH)D less than 10 ng/mL (<25 nmol/L). However, the definition of an optimal vitamin D status, as defined by 25(OH)D, remains controversial for many extra-bone conditions, including CV disease. In this review, confounding factors affecting the 25(OH)D measurement and status will be discussed. In particular, available evidence on the mechanism and role of vitamin D in relation to CV risk and disease through its antioxidant effect will be reported, also facing the aspect regarding the debate on the minimum blood 25(OH)D level required to ensure optimal CV health.
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Lee HJ, Yoo S, Hong JK, Ahn JS, Lee E, Moon H, Koo S, Kim T, Park J, Yoon IY. The effect of proto-type wearable light-emitting devices on serum 25-hydroxyvitamin D levels in healthy adults: a 4-week randomized controlled trial. Eur J Clin Nutr 2023; 77:342-347. [PMID: 36418536 PMCID: PMC9684875 DOI: 10.1038/s41430-022-01241-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 11/10/2022] [Accepted: 11/10/2022] [Indexed: 11/25/2022]
Abstract
BACKGROUND Many people in modern society have insufficient exposure to ultraviolet B (UVB) sunlight, which may lead to vitamin D deficiency. We aimed to investigate the effect of a proto-type wearable light-emitting diode (LED) device emitting UVB light on serum 25-hydroxyvitamin D levels. METHODS A total of 136 healthy adults were randomly assigned to receive either an active device emitting UVB light with a peak wavelength of 285 nm (n = 64) or a sham device emitting visible light (n = 72). All participants wore the device for a total of two minutes, one minute on each forearm, every day for 4 weeks. Serum 25-hydroxyvitamin D levels were assessed at baseline, 2, and 4 weeks of intervention, and 2 weeks after the end of the intervention. RESULTS A significant difference was found between the experimental and control groups in changes in serum 25-hydroxyvitamin D levels from baseline after two (0.25 ± 3.10 ng/mL vs. -1.07 ± 2.68 ng/mL, p = 0.009) and 4 weeks of intervention (0.75 ± 3.98 ng/mL vs. -1.75 ± 3.04 ng/mL, p < 0.001). In the experimental group, the dropout rate due to mild, self-limiting adverse skin reactions was 11.8% (9/76). The mean total 25-hydroxyvitamin D production after UVB exposure was estimated at 0.031 ng/mL per 1 cm2 of skin area. CONCLUSIONS A prototype wearable LED UVB device was effective for improving 25-hydroxyvitamin D status. The development of a safer wearable LED device for phototherapy may provide a novel daily, at-home option for vitamin D supplementation.
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Affiliation(s)
- Hyuk Joo Lee
- Department of Public Medical Service, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Seunghyup Yoo
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | | | - Jun Seok Ahn
- Department of Psychiatry, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea
| | - Eunyoung Lee
- Department of Psychiatry, Veteran Health Service Medical Center, Seoul, Republic of Korea
| | - Hanul Moon
- Department of Semiconductor & Department of Chemical Engineering (BK21 FOUR Graduate Program), Dong-A University, Busan, Republic of Korea
| | - Sunhyoung Koo
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea
| | - Tae Kim
- Gwangju Institute of Science and Technology (GIST), Gwangju, Republic of Korea
| | - Jaehyeok Park
- School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon, Republic of Korea.
| | - In-Young Yoon
- Department of Psychiatry, Seoul National University Bundang Hospital, Seongnam, Republic of Korea. .,Department of Psychiatry, Seoul National University College of Medicine, Seoul, Republic of Korea.
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Laaksi A, Laaksi I, Pihlajamäki H, Vaara JP, Luukkaala T, Kyröläinen H. Associations of serum 25(OH)D levels with physical performance and anabolic hormones in young men. Front Physiol 2023; 14:1049503. [PMID: 36824467 PMCID: PMC9941541 DOI: 10.3389/fphys.2023.1049503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 01/27/2023] [Indexed: 02/10/2023] Open
Abstract
Purpose: The present study examined the association of vitamin D measured by serum 25(OH)D with physical performance outcomes and serum levels of anabolic hormones in young men. Methods: 412 young men (age 19 ± 1 year) entering their compulsory military service volunteered to participate in the study. The study consisted of two groups from two different military bases: Group A was studied in January and group B in July. The groups were first compared with each other and due to statistically significant (p < 0.001 analyzed with independent samples t-test) differences in physical condition (sit-up, push-up, and standing long jump-tests and testosterone levels) between the groups, groups were analyzed separately. The serum levels of 25(OH)D, testosterone (TES), sex hormone binding globulin (SHBG), and insulin-like growth factor-1 (IGF-1) were analyzed by electrochemiluminescence immunoassay. Physical performance tests consisted of muscular fitness (sit-ups, push-ups, standing long jump) and aerobic fitness (12-minute-running) tests. The association of serum 25(OH)D with physical performance tests and anabolic hormones was analyzed using linear regression. Results: After controlling for the group, body mass index, and leisure-time physical activity, serum 25(OH)D level was positively associated with aerobic and muscular fitness (β = 0.15-0.20, all p < 0.05). Also, the participants with sufficient serum 25(OH)D levels (≥75 nmol/L) had better aerobic and muscular fitness and higher TES in group B, and better upper extremity muscular fitness in group A (all p < 0.05). In group A, there were 166 participants with serum levels of 25(OH) D < 75 nmol/L and 18 ≥ 75 nmol/L. In group B, the amounts were 92 (<75 nmol/L) and 136 (≥75 nmol/L), respectively. Conclusion: Serum 25(OH)D was positively associated with both aerobic and muscular fitness and those with sufficient vitamin D levels, had higher levels of TES. Thus, maintaining a sufficient serum 25(OH)D level may be beneficial for physical performance and anabolic state in young men.
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Affiliation(s)
- Akseli Laaksi
- Faculty of Medicine and Health Technology, University of Tampere, Tampere, Finland,*Correspondence: Akseli Laaksi,
| | - Ilkka Laaksi
- Faculty of Medicine and Health Technology, University of Tampere, Tampere, Finland,Centre for Military Medicine, Finnish Defence Forces, Riihimäki, Finland
| | - Harri Pihlajamäki
- Faculty of Medicine and Health Technology, University of Tampere, Tampere, Finland,Department of Orthopedics and Traumatology, Seinäjoki Central Hospital, Seinäjoki, Finland
| | - Jani P. Vaara
- Department of Leadership and Military Pedagogy, National Defence University, Helsinki, Finland
| | - Tiina Luukkaala
- Research, Development and Innovation Centre, Tampere University Hospital, Tampere, Finland,Health Sciences, Faculty of Social Sciences, University of Tampere, Tampere, Finland
| | - Heikki Kyröläinen
- Department of Leadership and Military Pedagogy, National Defence University, Helsinki, Finland,Faculty of Sport and Health Sciences, University of Jyväskylä, Jyväskylä, Finland
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Schnappinger T, Jadoun D, Gudem M, Kowalewski M. Time-resolved X-ray and XUV based spectroscopic methods for nonadiabatic processes in photochemistry. Chem Commun (Camb) 2022; 58:12763-12781. [PMID: 36317595 PMCID: PMC9671098 DOI: 10.1039/d2cc04875b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Accepted: 10/21/2022] [Indexed: 11/03/2023]
Abstract
The photochemistry of numerous molecular systems is influenced by conical intersections (CIs). These omnipresent nonadiabatic phenomena provide ultra-fast radiationless relaxation channels by creating degeneracies between electronic states and decide over the final photoproducts. In their presence, the Born-Oppenheimer approximation breaks down, and the timescales of the electron and nuclear dynamics become comparable. Due to the ultra-fast dynamics and the complex interplay between nuclear and electronic degrees of freedom, the direct experimental observation of nonadiabatic processes close to CIs remains challenging. In this article, we give a theoretical perspective on novel spectroscopic techniques capable of observing clear signatures of CIs. We discuss methods that are based on ultra-short laser pulses in the extreme ultraviolet and X-ray regime, as their spectral and temporal resolution allow for resolving the ultra-fast dynamics near CIs.
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Affiliation(s)
- Thomas Schnappinger
- Department of Physics, Stockholm University, Albanova University Centre, SE-106 91 Stockholm, Sweden.
| | - Deependra Jadoun
- Department of Physics, Stockholm University, Albanova University Centre, SE-106 91 Stockholm, Sweden.
| | - Mahesh Gudem
- Department of Physics, Stockholm University, Albanova University Centre, SE-106 91 Stockholm, Sweden.
| | - Markus Kowalewski
- Department of Physics, Stockholm University, Albanova University Centre, SE-106 91 Stockholm, Sweden.
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Larsen A, Hopstock L, Jorde R, Grimnes G. Associations of serum 25-hydroxyvitamin D and subjective sleep measures in an Arctic population: Insights from the population-based Tromsø Study. Sleep Med X 2022; 4:100056. [PMID: 36274862 PMCID: PMC9579360 DOI: 10.1016/j.sleepx.2022.100056] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 02/21/2022] [Accepted: 08/28/2022] [Indexed: 11/29/2022] Open
Abstract
Objective To investigate the relation between serum 25-hydroxyvitamin D (s-25(OH)D) and subjective sleep measures in an Arctic population (69°N). Methods Cross-sectional data was collected from 21,083 individuals (aged ≥40 years) participating in the population based Tromsø Study: Tromsø7 (2015–2016). The present study included 20,438 participants, after having excluded respondents missing data on s-25(OH)D (n = 161) and/or subjective sleep measures (including sleep duration, insomnia, and daytime sleepiness)(n = 490). Based on s-25(OH)D (assessed using LC-MS/MS), participants were grouped as deficient (<30 nmol/L), insufficient (30–49.9 nmol/L), sufficient (50–75 nmol/L), or high (>75 nmol/L). Sleep duration was grouped as inadequate (ISD) if < 7 or ≥9 h. Linear and logistic regression were used to calculate unstandardized β-values and odds ratios [95% confidence intervals]. The analyses were adjusted for season, age, BMI, lifestyle factors and relevant comorbidities. Results In both men and women, s-25(OH)D was positively associated with sleep duration, and compared to the sufficient s-25(OH)D group, the insufficient s-25(OH)D group reported significantly shorter sleep duration in both sexes. There was an increased odds of ISD in both men and women but adjusted for confounding factors this was only significant in women (1.16 [1.03, 1.32], p = .017). In men, there were no significant associations between s-25(OH)D and the remaining sleep measures. Women in the high s-25(OH)D group had lower ESS-scores (−0.28 [-0.47, −0.08], p = .006), but higher odds of insomnia (1.16 [1.01, 1.33], p = .036) compared to women in the sufficient group. Conclusions In this Arctic population, a tenuous association was found between s-25(OH)D and subjective sleep measures, predominantly in women. 25(OH)D was associated with self-reported sleep measures in this Arctic population. 25(OH)D was positively associated with self-reported sleep duration in both sexes. Women with sufficient 25(OH)D had lower odds of insomnia. RCTs are needed to determine the role of vitamin D in sleep health.
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Affiliation(s)
- A.U. Larsen
- Department of Clinical Medicine, UiT The Arctic University of Norway, 9037 Tromsø, Norway
- Corresponding author.
| | - L.A. Hopstock
- Department of Community Medicine, UiT The Arctic University of Norway, Tromsø, Norway
| | - R. Jorde
- Department of Clinical Medicine, UiT The Arctic University of Norway, 9037 Tromsø, Norway
- Division of Internal Medicine, University Hospital of North Norway, 9038 Tromsø, Norway
| | - G. Grimnes
- Department of Clinical Medicine, UiT The Arctic University of Norway, 9037 Tromsø, Norway
- Division of Internal Medicine, University Hospital of North Norway, 9038 Tromsø, Norway
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Jefferson A, Borges C. Evaluation of the safety, tolerability and plasma vitamin D response to long-term use of patented transdermal vitamin D patches in healthy adults: a randomised parallel pilot study. BMJ Nutr Prev Health 2022; 5:217-226. [PMID: 36619342 PMCID: PMC9813629 DOI: 10.1136/bmjnph-2022-000471] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Accepted: 07/15/2022] [Indexed: 01/11/2023] Open
Abstract
Background Vitamin D delivered transdermally may suppress hyperactivity in nociceptor pain receptors and alter pain intensity, offering a useful addition to localised pain management in varying clinical settings. Currently, little is known about long-term usage of continuous-release vitamin D patches. Method We conducted a randomised parallel pilot trial to evaluate safety and tolerability of daily application of patented (US8821921B2) transdermal vitamin D patches over 8 weeks and assess time-level profile of serum vitamin D. Compliance, tolerance and sun exposure were monitored daily, serum 25(OH)D measured 2-weekly and dietary intake and safety markers 4-weekly. Results Thirty healthy adults were randomised to two treatment groups: big patch and small patch. mean age was 36 years (20-68 years) with a 63% female to 37% male split. Patches differed in size but contained identical ingredients including 30 000 IU cholecalciferol. Physical and blood safety markers remained stable, within normal clinical parameters, and with no clinically meaningful changes throughout. Five big patch participants experienced skin irritation, which was mild and occasional for three, but continuous for two leading to patch withdrawal. There were no skin reactions in small patch group. average, serum 25(OH)D levels increased by +14 nmol/L (SD 11.63, range, -4 to 40 nmol/L) between baseline and week 8, with no significant differences between patch sizes. There was a shift in overall vitamin D status between baseline and week 8 (23% deficient (<30 nmol/L) decreasing to 0%, and normal (>50 nmol/L) increasing from 37% to 70% at week 8). Conclusion Based on these results, long-term (8 weeks) application of patented transdermal vitamin D patches was found to be safe. There may be minor skin tolerance issues with big patches for some, which appears to relate to patch size. Larger trials are warranted to explore the increase in vitamin D levels beyond 8 weeks. Trial registration number NCT04851990.
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Air pollutants are negatively associated with vitamin D-synthesizing UVB radiation intensity on the ground. Sci Rep 2021; 11:21480. [PMID: 34728744 PMCID: PMC8563978 DOI: 10.1038/s41598-021-00980-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 10/20/2021] [Indexed: 11/08/2022] Open
Abstract
Atmospheric levels of pollutants may reduce the UVB intensity at the earth's surface, with a subsequent reduction in cutaneous vitamin D synthesis. We investigated the association of various pollutants with UVB intensity on the ground. Four-year data obtained from four weather stations from across Kuwait were analyzed by median regression. Pollutants that were negatively associated with UVB were [β (95% CI)]: benzene [- 2.61 (- 4.13, - 1.09)], ethyl-benzene [- 2.20 (- 3.15, - 1.25)], ozone [- 0.23 (- 0.28, - 0.17)], nitric oxide [- 0.11 (- 0.15, - 0.06)], sulfur dioxide [- 0.10 (- 0.17, - 0.04)] and particulate matter PM10 [- 0.002 (- 0.003, - 0.002)]. Pollutants that were negatively associated with the UVB/UVA ratio were [β (95% CI)]: benzene [- 15.57 (- 24.94, - 6.20)], nitric oxide [- 0.53 (- 0.81, - 0.25)], ozone [- 0.38 (- 0.70, - 0.06)], and total hydrocarbon [- 0.02 (- 0.04, - 0.01)]. Furthermore, benzene and nitric oxide levels were higher in the morning and evening hours, which are the times of most solar exposure in this region due to high temperature during midday. In addition to other known factors, attenuation of UVB by these pollutants may contribute to lower vitamin D levels in populations. In addition to direct public health hazard, these pollutants may contribute to the very high prevalence of VDD in this region.
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Non-Musculoskeletal Benefits of Vitamin D beyond the Musculoskeletal System. Int J Mol Sci 2021; 22:ijms22042128. [PMID: 33669918 PMCID: PMC7924658 DOI: 10.3390/ijms22042128] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 02/13/2021] [Accepted: 02/17/2021] [Indexed: 02/06/2023] Open
Abstract
Vitamin D, a fat-soluble prohormone, is endogenously synthesized in response to sunlight or taken from dietary supplements. Since vitamin D receptors are present in most tissues and cells in the body, the mounting understanding of the role of vitamin D in humans indicates that it does not only play an important role in the musculoskeletal system, but has beneficial effects elsewhere as well. This review summarizes the metabolism of vitamin D, the research regarding the possible risk factors leading to vitamin D deficiency, and the relationships between vitamin D deficiency and numerous illnesses, including rickets, osteoporosis and osteomalacia, muscle weakness and falls, autoimmune disorders, infectious diseases, cardiovascular diseases (CVDs), cancers, and neurological disorders. The system-wide effects of vitamin D and the mechanisms of the diseases are also discussed. Although accumulating evidence supports associations of vitamin D deficiency with physical and mental disorders and beneficial effects of vitamin D with health maintenance and disease prevention, there continue to be controversies over the beneficial effects of vitamin D. Thus, more well-designed and statistically powered trials are required to enable the assessment of vitamin D’s role in optimizing health and preventing disease.
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Kalliokoski P, Widarsson M, Rodhe N, Löfvander M. Positive impact on vitamin D related lifestyle of medical advice in pregnant Somali-born women and new mothers: a mixed method study in Swedish primary care. BMC Public Health 2021; 21:297. [PMID: 33546641 PMCID: PMC7866682 DOI: 10.1186/s12889-021-10277-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 01/19/2021] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND A previous study showed that pregnant women/new mothers especially Somali-born and some Swedish-born had extremely low vitamin D levels and poor physical performance. Our study aimed to examine vitamin D related lifestyle, attitudes and behaviour before and after brief information about vitamin D, with special long-term focus on Somali-born women. METHODS A cohort of 91 pregnant women/new mothers having serum hydroxyvitamin D (S-25-OHD) ≤ 50 nmol/L (n = 51 Somali-born with one third < 10 nmol/L of S-25-OHD) in primary health care in Sweden was targeted for intervention. Brief individual oral and visual information on vitamin D was given by doctors at baseline and after four and ten months. Questionnaires with ordinal scales on vitamin D related lifestyle of food, clothing, and outdoor activities were distributed on all occasions. Focus-group interviews with 15 women from the target-group were performed after two years. A Somali interpreter was available. RESULTS Veiled clothing, indoor living, and a low intake of milk, cheese, and fatty fish were common in the target group. Consumption pattern had increased significantly among the Somali-born women at the four-month follow-up but declined to non-significant levels at the ten-month follow-up. The focus-group interviews showed improved understanding of vitamin D deficiency, symptoms and attitudes, but varying applied behaviours related to sun exposure. Sun exposure for the children and increased fish consumption was the most evident positive results. CONCLUSIONS Vitamin D related lifestyle, attitudes and behaviour improved in a Somali-born group of pregnant women/new mothers with severe vitamin D deficiency. The preventive measures suggested in our study may have impact on public health in relation to bone and muscle strength and immunity especially in vitamin D deficiency risk groups. TRIAL REGISTRATION ClinicalTrials.gov Identifier: NCT02922803 . Date of registration: 28 September 2016.
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Affiliation(s)
- P Kalliokoski
- Department of Public Health and Caring Sciences, Family Medicine and Preventive Medicine Section, Uppsala University, Husargatan 3, Postal address: Box 564, 751 22, Uppsala, Sweden.
| | - M Widarsson
- School of Health, Care and Social Welfare, Mälardalen University, Västerås, Sweden
| | - N Rodhe
- Department of Public Health and Caring Sciences, Family Medicine and Preventive Medicine Section, Uppsala University, Husargatan 3, Postal address: Box 564, 751 22, Uppsala, Sweden
| | - M Löfvander
- Department of Public Health and Caring Sciences, Family Medicine and Preventive Medicine Section, Uppsala University, Husargatan 3, Postal address: Box 564, 751 22, Uppsala, Sweden
- Centre for Clinical Research, Uppsala University, Västerås, Sweden
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Moozhipurath RK, Kraft L. Implications of monsoon season and UVB radiation for COVID-19 in India. Sci Rep 2021; 11:2757. [PMID: 33531606 PMCID: PMC7854580 DOI: 10.1038/s41598-021-82443-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2020] [Accepted: 01/20/2021] [Indexed: 11/19/2022] Open
Abstract
India has recorded 142,186 deaths over 36 administrative regions placing India third in the world after the US and Brazil for COVID-19 deaths as of 12 December 2020. Studies indicate that south-west monsoon season plays a role in the dynamics of contagious diseases, which tend to peak post-monsoon season. Recent studies show that vitamin D and its primary source Ultraviolet-B (UVB) radiation may play a protective role in mitigating COVID-19 deaths. However, the combined roles of the monsoon season and UVB radiation in COVID-19 in India remain still unclear. In this observational study, we empirically study the respective roles of monsoon season and UVB radiation, whilst further exploring, whether the monsoon season negatively impacts the protective role of UVB radiation in COVID-19 deaths in India. We use a log-linear Mundlak model to a panel dataset of 36 administrative regions in India from 14 March 2020–19 November 2020 (n = 6751). We use the cumulative COVID-19 deaths as the dependent variable. We isolate the association of monsoon season and UVB radiation as measured by Ultraviolet Index (UVI) from other confounding time-constant and time-varying region-specific factors. After controlling for various confounding factors, we observe that a unit increase in UVI and the monsoon season are separately associated with 1.2 percentage points and 7.5 percentage points decline in growth rates of COVID-19 deaths in the long run. These associations translate into substantial relative changes. For example, a permanent unit increase of UVI is associated with a decrease of growth rates of COVID-19 deaths by 33% (= − 1.2 percentage points) However, the monsoon season, mitigates the protective role of UVI by 77% (0.92 percentage points). Our results indicate a protective role of UVB radiation in mitigating COVID-19 deaths in India. Furthermore, we find evidence that the monsoon season is associated with a significant reduction in the protective role of UVB radiation. Our study outlines the roles of the monsoon season and UVB radiation in COVID-19 in India and supports health-related policy decision making in India.
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Affiliation(s)
| | - Lennart Kraft
- Faculty of Economics and Business, Goethe University Frankfurt, Theodor-W.-Adorno-Platz 4, 60629, Frankfurt, Germany
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Wesnes K, Myhr KM, Riise T, Kvistad SS, Torkildsen Ø, Wergeland S, Holmøy T, Midgard R, Bru A, Edland A, Eikeland R, Gosal S, Harbo HF, Kleveland G, Sørenes YS, Øksendal N, Bjørnevik K. Low vitamin D, but not tobacco use or high BMI, is associated with long-term disability progression in multiple sclerosis. Mult Scler Relat Disord 2021; 50:102801. [PMID: 33636616 DOI: 10.1016/j.msard.2021.102801] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Revised: 01/21/2021] [Accepted: 01/25/2021] [Indexed: 10/22/2022]
Abstract
BACKGROUND Low vitamin D levels, tobacco use and high body mass index (BMI) have been linked to adverse disease outcomes in multiple sclerosis (MS), but their influence on long-term disability progression remains unclear. Therefore, we explored whether these modifiable lifestyle factors were associated with 10-year clinical disability progression in patients with MS. METHODS In this prospective study, a cohort of 88 patients with relapsing-remitting MS completed a randomized controlled study on ω-3 fatty acids between 2004 and 2008. During 24 months, serum 25-hydroxyvitamin D (25(OH)D), serum cotinine (nicotine metabolite), and BMI were repeatedly measured. In 2017, a follow-up study was conducted among 80 of the participants, including disability assessment by the Expanded Disability Status Scale (EDSS). Linear regression was used to explore associations between the lifestyle factors and the EDSS change over 10 years. RESULTS Higher seasonally adjusted 25(OH)D levels were associated with lower 10-year EDSS progression (change in EDSS per 1 SD increase in 25(OH)D in a model adjusted for sex, age and baseline EDSS: -0.45 point, 95% CI: -0.75 to -0.16, p=0.003). Further adjustments for potential confounders related to lifestyle and disease status gave similar results. The association was mainly driven by low 25(OH)D levels during spring, as well as seasonally adjusted levels below 80 nmol/L. No clear association was found for BMI and cotinine. CONCLUSION Lower 25(OH)D levels, but apparently not tobacco use or higher BMI, were significantly associated with worse long-term disability progression in MS.
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Affiliation(s)
- Kristin Wesnes
- Department of Clinical Medicine, University of Bergen, Bergen, Norway; Neuro-SysMed, Department of Neurology, Haukeland University Hospital, Bergen, Norway; Department of Neurology, St. Olav's University Hospital, Trondheim, Norway.
| | - Kjell-Morten Myhr
- Department of Clinical Medicine, University of Bergen, Bergen, Norway; Neuro-SysMed, Department of Neurology, Haukeland University Hospital, Bergen, Norway
| | - Trond Riise
- Neuro-SysMed, Department of Neurology, Haukeland University Hospital, Bergen, Norway; Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
| | - Silje Stokke Kvistad
- Department of Clinical Medicine, University of Bergen, Bergen, Norway; Department of Immunology and Transfusion medicine, Haukeland University Hospital, Bergen, Norway
| | - Øivind Torkildsen
- Department of Clinical Medicine, University of Bergen, Bergen, Norway; Neuro-SysMed, Department of Neurology, Haukeland University Hospital, Bergen, Norway
| | - Stig Wergeland
- Neuro-SysMed, Department of Neurology, Haukeland University Hospital, Bergen, Norway; Norwegian Multiple Sclerosis Competence Center, Department of Neurology, Haukeland University Hospital, Bergen, Norway
| | - Trygve Holmøy
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway; Department of Neurology, Akershus University Hospital, Lørenskog, Norway
| | - Rune Midgard
- Department of Neurology, Molde Hospital, Molde, Norway
| | - Alla Bru
- Department of Neurology, Stavanger University Hospital, Stavanger, Norway
| | - Astrid Edland
- Department of Neurology, Vestre Viken Hospital Trust, Drammen, Norway
| | - Randi Eikeland
- Department of Neurology and Department of Paediatrics, Sørlandet Hospital Trust, Arendal, Norway
| | - Sonia Gosal
- Department of Neurology, Østfold Hospital Kalnes, Grålum, Norway
| | - Hanne F Harbo
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway; Department of Neurology, Oslo University Hospital Ullevaal, Oslo, Norway
| | - Grethe Kleveland
- Department of Neurology, Innlandet Hospital Lillehammer, Lillehammer, Norway
| | | | - Nina Øksendal
- Department of Neurology, Nordland hospital trust, Bodø, Norway
| | - Kjetil Bjørnevik
- Department of Global Public Health and Primary Care, University of Bergen, Bergen, Norway
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Differences and determinants of vitamin D deficiency among UK biobank participants: A cross-ethnic and socioeconomic study. Clin Nutr 2020; 40:3436-3447. [PMID: 33309415 DOI: 10.1016/j.clnu.2020.11.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/28/2020] [Accepted: 11/17/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND The public health relevance of true vitamin D deficiency is undisputed, although controversy remains regarding optimal vitamin D status. Few contemporary cross-ethnic studies have investigated the prevalence and determinants of very low 25-hydroxyvitamin D [25(OH)D] concentrations. METHODS We conducted cross-ethnic analyses on the prevalence and determinants of vitamin D deficiency (25(OH)D ≤ 25 nmol/L) using data from 440,581 UK Biobank participants, of which 415,903 identified as White European, 7880 Asian, 7602 Black African, 1383 Chinese, and 6473 of mixed ancestry. Determinants of vitamin D deficiency were examined by logistic regression. RESULTS The prevalence of vitamin D deficiency was highest among participants of Asian ancestry (57.2% in winter/spring and 50.8% in summer/autumn) followed by those of Black African ancestry (38.5% and 30.8%, respectively), mixed (36.5%, 22.5%), Chinese (33.1%, 20.7%) and White European ancestry (17.5%, 5.9%). Participants with higher socioeconomic deprivation were more likely to have 25(OH)D deficiency compared to less deprived participants (P = <1 × 10-300); this pattern was more apparent among those of White European ancestry and in summer (Pinteraction ≤6.4 × 10-5 for both). In fully-adjusted analyses, regular consumption of oily fish was associated with reduced odds of vitamin D deficiency across all ethnicities, while outdoor-time in summer was less effective for Black Africans (OR 0.89, 95% CI 0.70, 1.12) than White Europeans (OR 0.40, 95% CI 0.38, 0.42). CONCLUSIONS Severe vitamin D deficiency remains an issue throughout the UK, particularly in lower socioeconomic areas. In some groups, levels of deficiency are alarmingly high with one-half of Asian and one-third of Black African ancestry populations affected across seasons. KEY MESSAGES The prevalence of vitamin D deficiency in the UK is alarming, with certain ethnic and socioeconomic groups considered particularly vulnerable.
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Vitamin D status in children and adults in Sweden: dietary intake and 25-hydroxyvitamin D concentrations in children aged 10-12 years and adults aged 18-80 years. J Nutr Sci 2020; 9:e47. [PMID: 33101664 PMCID: PMC7550965 DOI: 10.1017/jns.2020.40] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 08/13/2020] [Accepted: 09/04/2020] [Indexed: 01/26/2023] Open
Abstract
The study aimed to estimate vitamin D intake and plasma/serum 25-hydroxyvitamin D (25(OH)D) concentrations, investigate determinants of 25(OH)D concentrations and compare two 25(OH)D assays. We conducted two nationwide cross-sectional studies in Sweden with 206 school children aged 10-12 years and 1797 adults aged 18-80 years (n 268 provided blood samples). A web-based dietary record was used to assess dietary intake. Plasma/serum 25(OH)D was analysed by liquid chromatography-mass spectrometry (LC-MS) and immunoassay in adults and LC-MS/MS in children. Most participants reported a vitamin D intake below the average requirement (AR), 16 % of children and 33 % of adults met the AR (7⋅5 μg). In adults, plasma 25(OH)D below 30 and 50 nmol/l were found in 1 and 18 % of participants during the summer period and in 9 and 40 % of participants during the winter period, respectively. In children, serum 25(OH)D below 30 and 50 nmol/l were found in 5 and 42 % of participants (samples collected March-May), respectively. Higher 25(OH)D concentrations were associated with the summer season, vacations in sunny locations (adults), and dietary intake of vitamin D and use of vitamin D supplements, while lower concentrations were associated with a higher BMI and an origin outside of Europe. Concentrations of 25(OH)D were lower using the immunoassay than with the LC-MS assay, but associations with dietary factors and seasonal variability were similar. In conclusion, vitamin D intake was lower than the AR, especially in children. The 25(OH)D concentrations were low in many participants, but few participants had a concentration below 30 nmol/l.
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19
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Saternus R, Reichrath J. [Power station sun and hormone factory skin : A current assessment of the importance of vitamin D metabolism during human evolution and strategies for UV prevention]. Hautarzt 2020; 71:772-785. [PMID: 32915242 DOI: 10.1007/s00105-020-04684-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The sun is of great importance for human health. One important reason for this is the production of vitamin D, endorphins and many other hormones by the skin due to stimulation by sunlight. Insufficient access to sunlight increases the risk for vitamin D deficiency, a pandemic which would affect more than one billion people worldwide and under which ca. 60% of the population in Germany would suffer. The skin has a unique position in vitamin D metabolism as elementary steps for vitamin D production take place here and it is furthermore a target organ for actions of vitamin D. Due to the many positive effects of the sun, a healthy balance must be found between UV protection to shield against skin cancer but also ensuring sufficient vitamin D production. For regulation of this fragile balance between photoprotection and vitamin D production, which has accompanied mankind throughout evolution, sunscreens are an integral part of the modern lifestyle, although critical reports on possible risks for their use have recently become more frequent. This article discusses the current state of knowledge on the importance of vitamin D metabolism in human skin and the use of sun creams.
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Affiliation(s)
- R Saternus
- Klinik für Dermatologie, Venerologie und Allergologie, Hautklinik und Poliklinik, Universitätsklinikum des Saarlandes, Kirrberger Str. 100, 66421, Homburg/Saar, Deutschland.
| | - J Reichrath
- Klinik für Dermatologie, Venerologie und Allergologie, Hautklinik und Poliklinik, Universitätsklinikum des Saarlandes, Kirrberger Str. 100, 66421, Homburg/Saar, Deutschland
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ALdaoseri HA, Zubairi MB. Vitamin D deficiency and treatment in Iraqi patients with primary fibromyalgia syndrome. THE EGYPTIAN RHEUMATOLOGIST 2020. [DOI: 10.1016/j.ejr.2019.05.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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A Critical Appraisal of Strategies to Optimize Vitamin D Status in Germany, a Population with a Western Diet. Nutrients 2019; 11:nu11112682. [PMID: 31698703 PMCID: PMC6893762 DOI: 10.3390/nu11112682] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2019] [Revised: 10/26/2019] [Accepted: 10/30/2019] [Indexed: 12/12/2022] Open
Abstract
During the last decade, our scientific knowledge of the pleiotropic biological effects of vitamin D metabolites and their relevance to human health has expanded widely. Beyond the well-known key role of vitamin D in calcium homeostasis and bone health, it has been shown that vitamin D deficiency is associated with a broad variety of independent diseases, including several types of cancer, and with increased overall mortality. Moreover, recent findings have demonstrated biological effects of the vitamin D endocrine system that are not mediated via activation of the classical nuclear vitamin D receptor (VDR) by binding with high affinity to its corresponding ligand, the biologically active vitamin D metabolite 1,25-dihydroxyvitamin D (1,25(OH)2D). In contrast, many of these new biological effects of vitamin D compounds, including regulation of the circadian clock and many metabolic functions, are mediated by other vitamin D metabolites, including 20-hydroxyvitamin D and 20,23-dihydroxyvitamin D, and involve their binding to the aryl hydrocarbon receptor (AhR) and retinoid-orphan receptor (ROR). In most populations, including the German population, UVB-induced cutaneous vitamin D production is the main source for fulfilling the human body’s requirements of vitamin D. However, this causes a dilemma because solar or artificial UVR exposure is associated with skin cancer risk. In addition to UVB-induced vitamin D production in skin, in humans, there are two other possible sources of vitamin D: from diet and supplements. However, only a few natural foods contain substantial amounts of vitamin D, and in most populations, the dietary source of vitamin D cannot fulfill the body´s requirements. Because an increasing body of evidence has convincingly demonstrated that vitamin D deficiency is very common worldwide, it is the aim of this paper to (i) give an update of the vitamin D status in a population with a western diet, namely, the German population, and to (ii) develop strategies to optimize the vitamin D supply that consider both the advantages as well as the disadvantages/risks of different approaches, including increasing vitamin D status by dietary intake, by supplements, or by UVB-induced cutaneous synthesis of vitamin D.
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Religi A, Backes C, Chatelan A, Bulliard JL, Vuilleumier L, Moccozet L, Bochud M, Vernez D. Estimation of exposure durations for vitamin D production and sunburn risk in Switzerland. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2019; 29:742-752. [PMID: 30992519 DOI: 10.1038/s41370-019-0137-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2018] [Revised: 02/25/2019] [Accepted: 03/08/2019] [Indexed: 06/09/2023]
Abstract
Although overexposure to solar ultraviolet radiation (UVR) is responsible for cutaneous melanoma and epithelial skin cancer and can cause negative health effects such as sunburn, a "little and often" exposure regime is often suggested to produce naturally recommended vitamin D levels, being essential for skeletal health. This study aimed to quantify solar UV doses needed to trigger 1000 International Units (IU) vitamin D doses and, at the same time, producing sunburn in Switzerland. Solar UV erythema irradiance (in mW/m2) measured at four meteorological stations in Switzerland for the period 2005-2017 were used to evaluate effective solar UV radiation producing 1000 IU vitamin D doses in skin phototype II and III individuals. Daily solar UV exposure durations (in minutes) needed to produce vitamin D with limited sunburn risk were estimated while considering mean vitamin D food intake of the Swiss population and seasonal skin coverage. In summer and spring, with 22% of uncovered skin, 1000 IU vitamin D doses are synthesized in 10-15 min of sun exposure for adults. Exposure durations between erythema risk and 1000 IU vitamin D production vary between 9 and 46 min. In winter and autumn, the recommended vitamin D production without sunburn risks often unachievable, since up to 6.5 h of sun exposure might be necessary considering 8-10% of uncovered skin surface. The vitamin D food intake only represented 10% of the recommended vitamin D production and remained unchanged throughout the year. These findings might clarify why vitamin D deficiency is common in Switzerland. Moreover, exposure durations between recommended vitamin D and increased sunburn risk might only differ by few minutes. Without additional oral vitamin D supplementation, daily doses of vitamin D (1000 IU) are not reachable in autumn and winter months in Switzerland.
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Affiliation(s)
- A Religi
- Centre Universitaire d'Informatique (CUI), University of Geneva, Geneva, Switzerland.
| | - C Backes
- Institute of Social and Preventive Medicine (IUMSP), Lausanne University Hospital (CHUV), 1010, Lausanne, Switzerland
- Institute for Work and Health, University of Lausanne and Geneva, 1010 Epalignes- Lausanne, Lausanne, Switzerland
| | - A Chatelan
- Institute of Social and Preventive Medicine (IUMSP), Lausanne University Hospital (CHUV), 1010, Lausanne, Switzerland
| | - J-L Bulliard
- Institute of Social and Preventive Medicine (IUMSP), Lausanne University Hospital (CHUV), 1010, Lausanne, Switzerland
| | - L Vuilleumier
- Federal Office of Meteorology and Climatology (MeteoSwiss), Payerne, Switzerland
| | - L Moccozet
- Centre Universitaire d'Informatique (CUI), University of Geneva, Geneva, Switzerland
| | - M Bochud
- Institute of Social and Preventive Medicine (IUMSP), Lausanne University Hospital (CHUV), 1010, Lausanne, Switzerland
| | - D Vernez
- Institute for Work and Health, University of Lausanne and Geneva, 1010 Epalignes- Lausanne, Lausanne, Switzerland
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Current Practice in Vitamin D Management in Allogeneic Hematopoietic Stem Cell Transplantation: A Survey by the Transplant Complications Working Party of the European Society for Blood and Marrow Transplantation. Biol Blood Marrow Transplant 2019; 25:2079-2085. [PMID: 31229642 DOI: 10.1016/j.bbmt.2019.06.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2019] [Revised: 06/05/2019] [Accepted: 06/15/2019] [Indexed: 11/23/2022]
Abstract
Beyond its impact on bone health, numerous studies have investigated the immune-regulatory properties of vitamin D and shown how its deficiency can affect outcomes in allogeneic hematopoietic stem cell transplantation (HSCT), particularly in acute or chronic graft-versus-host disease. This survey, carried out by the Transplant Complications Working Party of the European Society for Blood and Marrow Transplantation (EBMT), describes the current clinical practice discrepancies across the EBMT HSCT programs. We therefore recommend the development of evidence-based guidelines to standardize evaluation criteria and to harmonize the management of vitamin D deficiency in patients undergoing allogeneic HSCT.
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Abrahamsson H, Porojnicu AC, Lindstrøm JC, Dueland S, Flatmark K, Hole KH, Seierstad T, Moan J, Redalen KR, Meltzer S, Ree AH. High level of circulating vitamin D during neoadjuvant therapy may lower risk of metastatic progression in high-risk rectal cancer. BMC Cancer 2019; 19:488. [PMID: 31122213 PMCID: PMC6533753 DOI: 10.1186/s12885-019-5724-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 05/16/2019] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Following curative-intent neoadjuvant therapy in locally advanced rectal cancer, metastatic progression is still dominant. We investigated if patients' circulating 25-hydroxyvitamin D [25(OH)D] levels were associated with outcome. METHODS Serum 25(OH)D concentration was assessed by liquid chromatography-mass spectrometry in samples collected from 84 patients at baseline, completion of the neoadjuvant therapy, and treatment evaluation before surgery, and analyzed with respect to season, disease presentation, and treatment effects. RESULTS In the cohort of patients residing at latitude 58-62°N, baseline 25(OH)D differed significantly over the seasons, with highest measures (mean of 71.2 ± 5.6 nmol/L) in summer and lowest (48.7 ± 4.5 nmol/L) in spring, and changed over the three-month neoadjuvant period till response evaluation solely owing to season. The patient subgroup with slightly reduced performance status, anemia, and T4 disease that did not respond to the neoadjuvant therapy (ypT4 cases), had significantly lower baseline 25(OH)D (below 50 nmol/L) than T4 cases with response (ypT0-3) and T2-3 cases (above 60 nmol/L). Compared to the T4 patients with levels above 50 nmol/L, regarded as sufficient for a healthy bone status, those presenting levels below had significantly heightened risk of disease progression (mainly metastasis) and death, with hazard ratio of 3 and 17, respectively, on adjustment for age, sex, body mass index, and season. CONCLUSION Rectal cancer T4 cases had high risk of metastatic progression and death if circulating 25(OH)D levels were insufficient but obtained short-term and long-term outcome to neoadjuvant treatment no worse than patients with T2-3 disease when 25(OH)D was sufficient. TRIAL REGISTRATION ClinicalTrials.gov NCT00278694 ; registration date: 16 January 2006, retrospective to enrollment of the first 10 patients of the current report.
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Affiliation(s)
- Hanna Abrahamsson
- Department of Oncology, Akershus University Hospital, P.O. Box 1000, 1478, Lørenskog, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Alina C Porojnicu
- Department of Oncology, Akershus University Hospital, P.O. Box 1000, 1478, Lørenskog, Norway.,Department of Oncology, Vestre Viken Hospital Trust, Drammen, Norway
| | - Jonas C Lindstrøm
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Health Services Research Center, Akershus University Hospital, Lørenskog, Norway
| | - Svein Dueland
- Department of Oncology, Oslo University Hospital, Oslo, Norway
| | - Kjersti Flatmark
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway.,Department of Gastroenterological Surgery, Oslo University Hospital, Oslo, Norway.,Department of Tumor Biology, Oslo University Hospital, Oslo, Norway
| | - Knut H Hole
- Department of Radiology, Oslo University Hospital, Oslo, Norway
| | | | - Johan Moan
- Department of Radiation Oncology, Oslo University Hospital, Oslo, Norway.,Institute of Physics, University of Oslo, Oslo, Norway
| | - Kathrine Røe Redalen
- Department of Oncology, Akershus University Hospital, P.O. Box 1000, 1478, Lørenskog, Norway.,Department of Physics, Norwegian University of Science and Technology, Trondheim, Norway
| | - Sebastian Meltzer
- Department of Oncology, Akershus University Hospital, P.O. Box 1000, 1478, Lørenskog, Norway.,Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Anne Hansen Ree
- Department of Oncology, Akershus University Hospital, P.O. Box 1000, 1478, Lørenskog, Norway. .,Institute of Clinical Medicine, University of Oslo, Oslo, Norway.
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Almoudi MM, Hussein AS, Abu Hassan MI, Schroth RJ. Dental caries and vitamin D status in children in Asia. Pediatr Int 2019; 61:327-338. [PMID: 30740822 DOI: 10.1111/ped.13801] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 11/24/2018] [Accepted: 02/07/2019] [Indexed: 12/12/2022]
Abstract
Dental caries and vitamin D inadequacy are known to affect children worldwide. Vitamin D has a vital role in tooth formation. There is growing evidence linking suboptimal serum vitamin D level with dental caries in children. This paper reviews the literature on both the prevalence of dental caries and of vitamin D deficiency in children in four Asian regions, discusses their associated risk factors, and reviews the global evidence on the association between dental caries and vitamin D in children. Caries prevalence in children ranged from 40% to 97% in Eastern Asia, 38-73.7% in Southern Asia, and 26.5-74.7% in Western Asian countries. Moreover, a higher prevalence of vitamin D deficiency in Asian children was identified, even in countries in equatorial regions, ranging from 2.8% to 65.3% in Eastern Asia, 5-66.7% in Southern Asia, 4-45.5% in Western Asia and 38.1-78.7% in Central Asian countries. Obesity, age, female gender, higher latitude, season, darker skin pigmentation, sunlight protection behaviors, less sunlight exposure and low intake of food containing vitamin D were important factors associated with lower serum vitamin D in Asia. Suboptimal vitamin D level in children may be a significant risk factor for dental caries, and requires further research to ascertain such an association in children in Asia, as well as to understand its exact influence on caries risk and development.
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Affiliation(s)
- Manal Mohamed Almoudi
- Centre of Paediatric Dentistry and Orthodontics Studies, Faculty of Dentistry, Universiti Teknologi MARA, Selangor, Malaysia
| | - Alaa Sabah Hussein
- Centre of Paediatric Dentistry and Orthodontics Studies, Faculty of Dentistry, Universiti Teknologi MARA, Selangor, Malaysia
| | - Mohamed Ibrahim Abu Hassan
- Centre of Restorative Dentistry Studies, Faculty of Dentistry, Universiti Teknologi MARA, Selangor, Malaysia
| | - Robert J Schroth
- Department of Preventive Dental Science, College of Dentistry, Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.,Department of Pediatrics and Child Health, College of Medicine, Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
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Mendes MM, Darling AL, Hart KH, Morse S, Murphy RJ, Lanham-New SA. Impact of high latitude, urban living and ethnicity on 25-hydroxyvitamin D status: A need for multidisciplinary action? J Steroid Biochem Mol Biol 2019; 188:95-102. [PMID: 30610914 DOI: 10.1016/j.jsbmb.2018.12.012] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/02/2018] [Revised: 12/17/2018] [Accepted: 12/31/2018] [Indexed: 12/12/2022]
Abstract
The effects of urban living on health are becoming increasingly important, due to an increasing global population residing in urban areas. Concomitantly, due to immigration, there is a growing number of ethnic minority individuals (African, Asian or Middle Eastern descent) living in westernised Higher Latitude Countries (HLC) (e.g. Europe, Canada, New Zealand). Of concern is the fact that there is already a clear vitamin D deficiency epidemic in HLC, a problem which is likely to grow as the ethnic minority population in these countries increases. This is because 25-hydroxyvitamin D (25(OH)D) status of ethnic groups is significantly lower compared to native populations. Environmental factors contribute to a high prevalence of vitamin D deficiency in HLC, particularly during the winter months when there is no sunlight of appropriate wavelength for vitamin D synthesis via the skin. Also, climatic factors such as cloud cover may reduce vitamin D status even in the summer. This may be further worsened by factors related to urban living, including air pollution, which reduces UVB exposure to the skin, and less occupational sun exposure (may vary by individual HLC). Tall building height may reduce sun exposure by making areas more shaded. In addition, there are ethnicity-specific factors which further worsen vitamin D status in HLC urban dwellers, such as low dietary intake of vitamin D from foods, lower production of vitamin D in the skin due to increased melanin and reduced skin exposure to UVB due to cultural dress style and sun avoidance. A multidisciplinary approach applying knowledge from engineering, skin photobiology, nutrition, town planning and social science is required to prevent vitamin D deficiency in urban areas. Such an approach could include reduction of air pollution, modification of sun exposure advice to emphasise spending time each day in non-shaded urban areas (e.g. parks, away from tall buildings), and advice to ethnic minority groups to increase sun exposure, take vitamin D supplements and/or increase consumption of vitamin D rich foods in a way that is safe and culturally acceptable. This review hopes to stimulate further research to assess the impact of high latitude, urban environment and ethnicity on the risk of vitamin D deficiency.
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Affiliation(s)
- Marcela M Mendes
- Department of Nutritional Sciences, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, UK.
| | - Andrea L Darling
- Department of Nutritional Sciences, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, UK.
| | - Kathryn H Hart
- Department of Nutritional Sciences, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, UK.
| | - Stephen Morse
- Centre for Environment and Sustainability, University of Surrey, UK.
| | - Richard J Murphy
- Centre for Environment and Sustainability, University of Surrey, UK.
| | - Susan A Lanham-New
- Department of Nutritional Sciences, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, UK.
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Kocic S, Ristic S, Zivanovic S, Mihailovic N, Curcic S, Vasiljevic D. The Impact of Socioeconomic Characteristics and Lifestyles on Vitamin D Deficit in Mentally Ill Patients. SERBIAN JOURNAL OF EXPERIMENTAL AND CLINICAL RESEARCH 2019. [DOI: 10.1515/sjecr-2017-0026] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Abstract
Mental illnesses put patients at high risk for vitamin D deficit. The aim of the research is to examine the impacts of socioeconomic characteristics and lifestyles on vitamin D deficiency in mentally diseased patients. In this crosssectional study we used blood samples from patients who were treated for mental disorders at Specialist-consultative unit of the Health Center and Clinical Center Kragujevac from May-June 2014. The study used a questionnaire for the assessment of vitamin D status. The study included 220 subjects with different types of mental disorders. Normal values of vitamin D were detected in 16% of patients whereas 64% of patients had vitamin D deficiency. The patients with vitamin D deficit were in average 3 years older than that but the difference is not statistically significant (p>0.05). The patients with vitamin D deficiency were primarily female (p=0.003), people with high-school education from urban environment who lived in bad life conditions (p>0.05). Between patients with and without vitamin D deficiency there is no difference in cigarette consumption, in the number of cigarettes per day, in alcohol usage, in coffee consumption and in nutrition. However, the patients without vitamin D deficiency spent more time outside; during the past year were more exposed to sun and during the past seven days spent more than 30 minutes a day exposed to sunlight (p<0.01). These facts indicate that there is a current need for further research in this area.
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Affiliation(s)
- Sanja Kocic
- Faculty of Medical Sciences , University of Kragujevac , Kragujevac , Serbia
- Institute of Public Health Kragujevac , Kragujevac , Srbija
| | - Svetlana Ristic
- Institute for Oncology and Radiology of Serbia , Belgrade , Serbia
| | - Sandra Zivanovic
- Faculty of Hotel Management and Tourism in Vrnjacka Banja , University of Kragujevac , Vrnjaca Banja , Serbia
| | | | - Svetlana Curcic
- Faculty of Education in Jagodina , University of Kragujevac , Jagodina , Srbija
| | - Dragan Vasiljevic
- Faculty of Medical Sciences , University of Kragujevac , Kragujevac , Serbia
- Institute of Public Health Kragujevac , Kragujevac , Srbija
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Abstract
Objective To investigate serum 25-hydroxyvitamin D (S-25(OH)D) concentration in a multi-ethnic population of northern Norway and determine predictors of S-25(OH)D, including Sami ethnicity. Design Cross-sectional data from the second survey of the Population-based Study on Health and Living Conditions in Regions with Sami and Norwegian Populations (the SAMINOR 2 Clinical Survey, 2012–2014). S-25(OH)D was measured by the IDS-iSYS 25-Hydroxy Vitamin Dˢ assay. Daily dietary intake was assessed using an FFQ. BMI was calculated using weight and height measurements. Setting Ten municipalities of northern Norway (latitude 68°–70°N). Participants Males (n 2041) and females (n 2424) aged 40–69 years. Results Mean S-25(OH)D in the study sample was 64·0 nmol/l and median vitamin D intake was 10·3 µg/d. The prevalence of S-25(OH)D<30 nmol/l was 1·9 % and <50 nmol/l was 24·7 %. In sex-specific multivariable linear regression models, older age, blood sample collection in September–October, solarium use, sunbathing holiday, higher alcohol intake (in females), use of cod-liver oil/fish oil supplements, use of vitamin/mineral supplements and higher intakes of vitamin D were significantly associated with higher S-25(OH)D, whereas being a current smoker and obesity were associated with lower S-25(OH)D. These factors explained 21–23 % of the variation in S-25(OH)D. Conclusions There were many modifiable risk factors related to S-25(OH)D, however no clear ethnic differences were found. Even in winter, the low prevalence of vitamin D deficiency found among participants with non-Sami, multi-ethnic Sami and Sami self-perceived ethnicity was likely due to adequate vitamin D intake.
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Gu Y, Luan X, Ren W, Zhu L, He J. Impact of seasons on stroke-related depression, mediated by vitamin D status. BMC Psychiatry 2018; 18:359. [PMID: 30409201 PMCID: PMC6225690 DOI: 10.1186/s12888-018-1944-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 10/25/2018] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND This study aimed to describe the seasonal variation of depression prevalence among stroke patients at 1 month and to explore whether vitamin D plays a role in the association between seasons and post-stroke depression (PSD). METHODS Data were collected from 402 acute stroke patients. Seasons were stratified by summertime (June to November) and wintertime (December to May) based on vitamin D status. The impact of seasons on PSD was assessed via binary logistic regression, with summertime considered the referent category. The mediating effect was used to evaluate whether vitamin D plays a role in the association between seasons and PSD. RESULTS The prevalence of PSD was significantly higher in the wintertime group than in the summertime group (P = 0.003). The serum vitamin D level was lower in wintertime than in summertime (P < 0.001). Lower vitamin D levels were associated with higher HAMD scores (P < 0.001). In the multivariate analysis, patients in the wintertime group had a higher prevalence of PSD compared with those in the summertime group across all binary logistic regression models after adjusting for potential confounders. When serum vitamin D was added to the above model, there was no association between seasons and PSD (P = 0.056). Vitamin D was independently associated with PSD (OR 0.95, 95% CI 0.935-0.966, P < 0.001). CONCLUSION There was a clear seasonal variation in depression prevalence among stroke patients. Vitamin D status plays a critical mediating role in the relationship between season and post-stroke depression.
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Affiliation(s)
- Yingying Gu
- 0000 0004 1808 0918grid.414906.eDepartment of Psychiatry, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000 Zhejiang Province China
| | - Xiaoqian Luan
- 0000 0004 1808 0918grid.414906.eDepartment of Neurology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000 Zhejiang Province China
| | - Wenwei Ren
- 0000 0004 1808 0918grid.414906.eDepartment of Neurology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000 Zhejiang Province China
| | - Lin Zhu
- 0000 0004 1808 0918grid.414906.eDepartment of Pediatrics, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000 Zhejiang Province China
| | - Jincai He
- Department of Neurology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, 325000, Zhejiang Province, China.
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Population-level rhythms in human skin with implications for circadian medicine. Proc Natl Acad Sci U S A 2018; 115:12313-12318. [PMID: 30377266 DOI: 10.1073/pnas.1809442115] [Citation(s) in RCA: 75] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Skin is the largest organ in the body and serves important barrier, regulatory, and sensory functions. The epidermal layer shows rhythmic physiological responses to daily environmental variation (e.g., DNA repair). We investigated the role of the circadian clock in the transcriptional regulation of epidermis using a hybrid experimental design, in which a limited set of human subjects (n = 20) were sampled throughout the 24-h cycle and a larger population (n = 219) were sampled once. We found a robust circadian oscillator in human epidermis at the population level using pairwise correlations of clock and clock-associated genes in 298 epidermis samples. We then used CYCLOPS to reconstruct the temporal order of all samples, and identified hundreds of rhythmically expressed genes at the population level in human epidermis. We compared these results with published time-series skin data from mice and found a strong concordance in circadian phase across species for both transcripts and pathways. Furthermore, like blood, epidermis is readily accessible and a potential source of biomarkers. Using ZeitZeiger, we identified a biomarker set for human epidermis that is capable of reporting circadian phase to within 3 hours from a single sample. In summary, we show rhythms in human epidermis that persist at the population scale and describe a path to develop robust single-sample circadian biomarkers.
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31
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Ghareghani M, Reiter RJ, Zibara K, Farhadi N. Latitude, Vitamin D, Melatonin, and Gut Microbiota Act in Concert to Initiate Multiple Sclerosis: A New Mechanistic Pathway. Front Immunol 2018; 9:2484. [PMID: 30459766 PMCID: PMC6232868 DOI: 10.3389/fimmu.2018.02484] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2018] [Accepted: 10/08/2018] [Indexed: 12/12/2022] Open
Abstract
Multiple sclerosis (MS) is an inflammatory demyelinating disease of the central nervous system (CNS). While the etiology of MS is still largely unknown, scientists believe that the interaction of several endogenous and exogenous factors may be involved in this disease. Epidemiologists have seen an increased prevalence of MS in countries at high latitudes, where the sunlight is limited and where the populations have vitamin D deficiency and high melatonin levels. Although the functions and synthesis of vitamin D and melatonin are contrary to each other, both are involved in the immune system. While melatonin synthesis is affected by light, vitamin D deficiency may be involved in melatonin secretion. On the other hand, vitamin D deficiency reduces intestinal calcium absorption leading to gut stasis and subsequently increasing gut permeability. The latter allows gut microbiota to transfer more endotoxins such as lipopolysaccharides (LPS) into the blood. LPS stimulates the production of inflammatory cytokines within the CNS, especially the pineal gland. This review summarizes the current findings on the correlation between latitude, sunlight and vitamin D, and details their effects on intestinal calcium absorption, gut microbiota and neuroinflammatory mediators in MS. We also propose a new mechanistic pathway for the initiation of MS.
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Affiliation(s)
- Majid Ghareghani
- CERVO Brain Research Center, Quebec City, QC, Canada.,Medicinal Plants Research Center, Yasuj University of Medical Sciences, Yasuj, Iran
| | - Russel J Reiter
- Department of Cell Systems and Anatomy, The University of Texas Health Science Center, San Antonio, TX, United States
| | - Kazem Zibara
- PRASE, Biology Department, Faculty of Sciences-I, Lebanese University, Beirut, Lebanon
| | - Naser Farhadi
- Cellular and Molecular Research Center, Yasuj University of Medical Sciences, Yasuj, Iran
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Estimated vitamin D synthesis and dietary vitamin D intake among Asians in two distinct geographical locations (Kuala Lumpur, 3°N v. Aberdeen, 57°N) and climates. Public Health Nutr 2018; 21:3118-3124. [PMID: 30176950 DOI: 10.1017/s1368980018002057] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE To compare the contributions of UVB exposure and diet to total vitamin D among Asians living in Kuala Lumpur (KL) and Aberdeen (AB). DESIGN Longitudinal study. SETTING UVB exposure (using polysulfone film badges) and skin colour and dietary vitamin D intake (by web-based questionnaire) were measured at each season in AB and during south-west (SWM) and north-east monsoons (NEM) in KL. SUBJECTS One hundred and fifteen Asians in KL and eighty-five Asians in AB aged 20-50 years. RESULTS Median summer UVB exposure of Asians in AB (0·25 SED/d) was higher than UVB exposure for the KL participants (SWM=0·20 SED/d, P=0·02; NEM= 0·14 SED/d, P<0·01). UVB exposure was the major source of vitamin D in KL year-round (60%) but only during summer in AB (59%). Median dietary vitamin D intake was higher in AB (3·50 µg/d (140 IU/d)), year-round, than in KL (SWM=2·05 µg/d (82 IU/d); NEM=1·83 µg/d (73 IU/d), P<0·01). Median total vitamin D (UVB plus diet) was higher in AB only during summer (8·45 µg/d (338 IU/d)) compared with KL (SWM=6·03 µg/d (241 IU/d), P=0·04; NEM=5·35 µg/d (214 IU/d), P<0·01), with a comparable intake across the full year (AB=5·75 µg/d (230 IU/d); KL=6·15 µg/d (246 IU/d), P=0·78). CONCLUSIONS UVB exposure among Asians in their home country is low. For Asians residing at the northerly latitude of Scotland, acquiring vitamin D needs from UVB exposure alone (except in summer) may be challenging due to low ambient UVB in AB (available only from April to October).
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Vitamin D Intervention and Bone: A Randomized Clinical Trial in Fair- and Dark-skinned Children at Northern Latitudes. J Pediatr Gastroenterol Nutr 2018; 67:388-394. [PMID: 29851760 DOI: 10.1097/mpg.0000000000002031] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
OBJECTIVES The aim of the study was to evaluate vitamin D status and effects of vitamin D intervention on bone mineral density (BMD) and content (BMC) in children with fair and dark skin in Sweden during winter. METHODS In a 2-center prospective double-blinded randomized intervention study 5- to 7-year-old children (n = 206) with fair and dark skin in Sweden (55°N-63°N) received daily vitamin D supplements of 25 μg, 10 μg, or placebo (2 μg) during 3 winter months. We measured BMD and BMC for total body (TB), total body less head (TBLH), femoral neck (FN), and spine at baseline and 4 months later. Intake of vitamin D and calcium, serum 25-hydroxy vitamin D (S-25[OH]D), and related parameters were analyzed. RESULTS Despite lower S-25(OH)D in dark than fair-skinned children, BMD of TB (P = 0.012) and TBLH (P = 0.002) and BMC of TBLH (P = 0.04) were higher at baseline and follow-up in those with dark skin. Delta (Δ) BMD and BMC of TB and TBLH did not differ between intervention and placebo groups, but FN-BMC increased more among dark-skinned children in the 25 μg (P = 0.038) and 10 μg (P = 0.027) groups compared to placebo. We found no associations between Δ S-25(OH)D, P-parathyroid hormone, P-alkaline phosphatase, and Δ BMD and BMC, respectively. CONCLUSIONS BMD and BMC remained higher in dark- than fair-skinned children despite lower vitamin D status. Even though no difference in general was found in BMD or BMC after vitamin D intervention, the increase in FN-BMC in dark-skinned children may suggest an influence on bone in those with initially insufficient vitamin D status.
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Turck D, Bresson JL, Burlingame B, Dean T, Fairweather-Tait S, Heinonen M, Hirsch-Ernst KI, Mangelsdorf I, McArdle HJ, Naska A, Nowicka G, Pentieva K, Sanz Y, Siani A, Sjödin A, Stern M, Tomé D, Loveren HV, Vinceti M, Willatts P, Fewtrell M, Lamberg-Allardt C, Przyrembel H, Arcella D, Dumas C, Fabiani L, Martino L, Tomcikova D, Neuhäuser-Berthold M. Update of the tolerable upper intake level for vitamin D for infants. EFSA J 2018; 16:e05365. [PMID: 32626014 PMCID: PMC7009676 DOI: 10.2903/j.efsa.2018.5365] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Following a request from the European Commission, the Panel on Dietetic Products, Nutrition and Allergies (NDA) was asked to revise the tolerable upper intake level (UL) for vitamin D for infants (≤ 1 year) set in 2012. From its literature review, the Panel concluded that the available evidence on daily vitamin D intake and the risk of adverse health outcomes (hypercalciuria, hypercalcaemia, nephrocalcinosis and abnormal growth patterns) cannot be used alone for deriving the UL for infants. The Panel conducted a meta-regression analysis of collected data, to derive a dose-response relationship between daily supplemental intake of vitamin D and mean achieved serum 25(OH)D concentrations. Considering that a serum 25(OH)D concentration of 200 nmol/L or below is unlikely to pose a risk of adverse health outcomes in infants, the Panel estimated the percentage of infants reaching a concentration above this value at different intakes of vitamin D. Based on the overall evidence, the Panel kept the UL of 25 μg/day for infants aged up to 6 months and set a UL of 35 μg/day for infants 6-12 months. The Panel was also asked to advise on the safety of the consumption of infant formulae with an increased maximum vitamin D content of 3 μg/100 kcal (Commission Delegated Regulation (EU) 2016/127 repealing Directive 2006/141/EC in 2020). For infants aged up to 4 months, the intake assessment showed that the use of infant formulae containing vitamin D at 3 μg/100 kcal may lead some infants to receive an intake above the UL of 25 μg/day from formulae alone without considering vitamin D supplemental intake. For infants aged 4-12 months, the 95th percentile of vitamin D intake (high consumers) estimated from formulae and foods fortified or not with vitamin D does not exceed the ULs, without considering vitamin D supplemental intake.
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Manios Y, Moschonis G, Lambrinou CP, Mavrogianni C, Tsirigoti L, Hoeller U, Roos FF, Bendik I, Eggersdorfer M, Celis-Morales C, Livingstone KM, Marsaux CFM, Macready AL, Fallaize R, O'Donovan CB, Woolhead C, Forster H, Walsh MC, Navas-Carretero S, San-Cristobal R, Kolossa S, Hallmann J, Jarosz M, Surwiłło A, Traczyk I, Drevon CA, van Ommen B, Grimaldi K, Matthews JNS, Daniel H, Martinez JA, Lovegrove JA, Gibney ER, Brennan L, Saris WHM, Gibney M, Mathers JC. Associations of vitamin D status with dietary intakes and physical activity levels among adults from seven European countries: the Food4Me study. Eur J Nutr 2018; 57:1357-1368. [PMID: 28289868 DOI: 10.1007/s00394-017-1415-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 02/19/2017] [Indexed: 10/20/2022]
Abstract
PURPOSE To report the vitamin D status in adults from seven European countries and to identify behavioural correlates. METHODS In total, 1075 eligible adult men and women from Ireland, Netherlands, Spain, Greece, UK, Poland and Germany, were included in the study. RESULTS Vitamin D deficiency and insufficiency, defined as 25-hydroxy vitamin D3 (25-OHD3) concentration of <30 and 30-49.9 nmol/L, respectively, were observed in 3.3 and 30.6% of the participants. The highest prevalence of vitamin D deficiency was found in the UK and the lowest in the Netherlands (8.2 vs. 1.1%, P < 0.05). In addition, the prevalence of vitamin D insufficiency was higher in females compared with males (36.6 vs. 22.6%, P < 0.001), in winter compared with summer months (39.3 vs. 25.0%, P < 0.05) and in younger compared with older participants (36.0 vs. 24.4%, P < 0.05). Positive dose-response associations were also observed between 25-OHD3 concentrations and dietary vitamin D intake from foods and supplements, as well as with physical activity (PA) levels. Vitamin D intakes of ≥5 μg/day from foods and ≥5 μg/day from supplements, as well as engagement in ≥30 min/day of moderate- and vigorous-intensity PA were associated with higher odds (P < 0.05) for maintaining sufficient (≥50 nmol/L) 25-OHD3 concentrations. CONCLUSIONS The prevalence of vitamin D deficiency varied considerably among European adults. Dietary intakes of ≥10 μg/day of vitamin D from foods and/or supplements and at least 30 min/day of moderate- and vigorous-intensity PA were the minimum thresholds associated with vitamin D sufficiency.
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Affiliation(s)
- Yannis Manios
- Department of Nutrition and Dietetics, School of Heath Science and Education, Harokopio University, Athens, Greece.
- Department of Nutrition and Dietetics, School of Health Science and Education, Harokopio University of Athens, 70, El Venizelou Ave, Kallithea, 176 71, Athens, Greece.
| | - George Moschonis
- Department of Nutrition and Dietetics, School of Heath Science and Education, Harokopio University, Athens, Greece
| | - Christina P Lambrinou
- Department of Nutrition and Dietetics, School of Heath Science and Education, Harokopio University, Athens, Greece
| | - Christina Mavrogianni
- Department of Nutrition and Dietetics, School of Heath Science and Education, Harokopio University, Athens, Greece
| | - Lydia Tsirigoti
- Department of Nutrition and Dietetics, School of Heath Science and Education, Harokopio University, Athens, Greece
| | - Ulrich Hoeller
- Analytical Research Centre and Human Nutrition & Health, DSM Nutritional Products, 4002, Basel, Switzerland
| | - Franz F Roos
- Analytical Research Centre and Human Nutrition & Health, DSM Nutritional Products, 4002, Basel, Switzerland
| | - Igor Bendik
- Analytical Research Centre and Human Nutrition & Health, DSM Nutritional Products, 4002, Basel, Switzerland
| | - Manfred Eggersdorfer
- Analytical Research Centre and Human Nutrition & Health, DSM Nutritional Products, 4002, Basel, Switzerland
| | - Carlos Celis-Morales
- Human Nutrition Research Centre, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Katherine M Livingstone
- Human Nutrition Research Centre, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, UK
| | - Cyril F M Marsaux
- Department of Human Biology, NUTRIM, School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Anna L Macready
- Hugh Sinclair Unit of Human Nutrition and Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, UK
| | - Rosalind Fallaize
- Hugh Sinclair Unit of Human Nutrition and Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, UK
| | - Clare B O'Donovan
- UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Republic of Ireland
| | - Clara Woolhead
- UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Republic of Ireland
| | - Hannah Forster
- UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Republic of Ireland
| | - Marianne C Walsh
- UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Republic of Ireland
| | - Santiago Navas-Carretero
- Department of Nutrition and Physiology, University of Navarra; CIBER Fisiopatología Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Pamplona, Spain
| | - Rodrigo San-Cristobal
- Department of Nutrition and Physiology, University of Navarra; CIBER Fisiopatología Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Pamplona, Spain
| | - Silvia Kolossa
- ZIEL Research Center of Nutrition and Food Sciences, Biochemistry Unit, Technische Universität München, Munich, Germany
| | - Jacqueline Hallmann
- ZIEL Research Center of Nutrition and Food Sciences, Biochemistry Unit, Technische Universität München, Munich, Germany
| | | | | | - Iwona Traczyk
- National Food & Nutrition Institute (IZZ), Warsaw, Poland
| | - Christian A Drevon
- Department of Nutrition, Institute of Basic Medical Sciences, Faculty of Medicine, University of Oslo, Oslo, Norway
| | - Ben van Ommen
- Microbiology and Systems Biology Group, TNO, Zeist, the Netherlands
| | | | - John N S Matthews
- School of Mathematics and Statistics, Newcastle University, Newcastle upon Tyne, UK
| | - Hannelore Daniel
- ZIEL Research Center of Nutrition and Food Sciences, Biochemistry Unit, Technische Universität München, Munich, Germany
| | - J Alfredo Martinez
- Department of Nutrition and Physiology, University of Navarra; CIBER Fisiopatología Obesidad y Nutrición (CIBERobn), Instituto de Salud Carlos III, Pamplona, Spain
| | - Julie A Lovegrove
- Hugh Sinclair Unit of Human Nutrition and Institute for Cardiovascular and Metabolic Research, University of Reading, Reading, UK
| | - Eileen R Gibney
- UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Republic of Ireland
| | - Lorraine Brennan
- UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Republic of Ireland
| | - Wim H M Saris
- Department of Human Biology, NUTRIM, School for Nutrition and Translational Research in Metabolism, Maastricht University Medical Centre, Maastricht, The Netherlands
| | - Mike Gibney
- UCD Institute of Food and Health, University College Dublin, Belfield, Dublin 4, Republic of Ireland
| | - John C Mathers
- Human Nutrition Research Centre, Institute of Cellular Medicine, Newcastle University, Newcastle upon Tyne, UK
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Lehnert M, Beine A, Burek K, Putzke S, Schlösser S, Pallapies D, Brüning T, Behrens T, Rabstein S. Vitamin D supply in shift working nurses. Chronobiol Int 2018; 35:724-729. [PMID: 29641263 DOI: 10.1080/07420528.2018.1424719] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
We studied determinants of Vitamin D in serum of 67 female health care workers (aged 25-60 years), including age, body mass index, physical activity, and shift work. Overall, vitamin D levels were low, ranging from 6 to 51 ng/mL (median: 20 ng/mL). Lower serum levels were found in samples drawn in winter and spring and in obese subjects. Shift work had only small effects on vitamin D levels. The high prevalence of vitamin D undersupply is in line with observations from the German general population. Vitamin D supply particularly in winter and spring should be ensured to avoid health problems.
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Affiliation(s)
- Martin Lehnert
- a Center for Epidemiology, Institute for Prevention and Occupational Medicine of the German Social Accident Insurance , Institute of the Ruhr-Universität Bochum (IPA) , Bochum , Germany
| | - Alexandra Beine
- b Center for Medicine, Institute for Prevention and Occupational Medicine of the German Social Accident Insurance , Institute of the Ruhr-Universität Bochum (IPA) , Bochum , Germany
| | - Katarzyna Burek
- a Center for Epidemiology, Institute for Prevention and Occupational Medicine of the German Social Accident Insurance , Institute of the Ruhr-Universität Bochum (IPA) , Bochum , Germany
| | - Simone Putzke
- a Center for Epidemiology, Institute for Prevention and Occupational Medicine of the German Social Accident Insurance , Institute of the Ruhr-Universität Bochum (IPA) , Bochum , Germany
| | - Stephan Schlösser
- c Occupational physician at BG University Hospital Bergmannsheil , Bochum , Germany
| | - Dirk Pallapies
- a Center for Epidemiology, Institute for Prevention and Occupational Medicine of the German Social Accident Insurance , Institute of the Ruhr-Universität Bochum (IPA) , Bochum , Germany
| | - Thomas Brüning
- d Director of the Institute for Prevention and Occupational Medicine of the German Social Accident Insurance , Institute of the Ruhr-Universität Bochum (IPA) , Bochum , Germany
| | - Thomas Behrens
- a Center for Epidemiology, Institute for Prevention and Occupational Medicine of the German Social Accident Insurance , Institute of the Ruhr-Universität Bochum (IPA) , Bochum , Germany
| | - Sylvia Rabstein
- a Center for Epidemiology, Institute for Prevention and Occupational Medicine of the German Social Accident Insurance , Institute of the Ruhr-Universität Bochum (IPA) , Bochum , Germany
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Karppinen T, Ala-Houhala M, Ylianttila L, Kautiainen H, Lakkala K, Hannula HR, Turunen E, Viljakainen H, Reunala T, Snellman E. The effect of vernal solar UV radiation on serum 25-hydroxyvitamin D concentration depends on the baseline level: observations from a high latitude in Finland. Int J Circumpolar Health 2018; 76:1272790. [PMID: 28452681 PMCID: PMC5328343 DOI: 10.1080/22423982.2016.1272790] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Humans obtain vitamin D from conversion of 7-dehydrocholesterol in the skin by ultraviolet B (UVB) radiation or from dietary sources. As the radiation level is insufficient in winter, vitamin D deficiency is common at higher latitudes. We assessed whether vernal solar UVB radiation at latitudes 61°N and 67°N in Finland has an impact on serum 25-hydroxyvitamin D [S-25(OH)D] concentrations. Twenty-seven healthy volunteers participated in outdoor activities in snow-covered terrain for 4–10 days in March or April, with their face and hands sun-exposed. The personal UVB doses and S-25(OH)D levels were monitored. A mean UVB dose of 11.8 standard erythema doses (SED) was received during an average of 12.3 outdoor hours. The mean S-25(OH)D concentration in subjects with a baseline concentration below 90.0 nmol/L (n=13) increased significantly, by 6.0 nmol/L from an initial mean of 62.4 nmol/L (p<0.001), whereas in those with a basal concentration above 90.0 nmol/L (n=12) it decreased significantly, by 6.7 nmol/L from a mean of 116.9 nmol/L (p<0.01). To conclude, only 7% of total body surface area was exposed to vernal sunlight and this was capable of increasing S-25(OH)D levels in subjects with a baseline level below 90 nmol/L but not in those with higher levels.
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Affiliation(s)
- Toni Karppinen
- a Medical School , University of Tampere , Tampere , Finland.,b Department of Dermatology , Tampere University Hospital , Tampere , Finland.,c Department of Dermatology , Päijät-Häme Central Hospital , Lahti , Finland
| | - Meri Ala-Houhala
- b Department of Dermatology , Tampere University Hospital , Tampere , Finland
| | - Lasse Ylianttila
- d Non ionizing radiation laboratory , Radiation and Nuclear Safety Authority , Helsinki , Finland
| | - Hannu Kautiainen
- e Unit of Primary Health Care , Helsinki University Central Hospital , Helsinki , Finland.,f Department of General Practice , University of Helsinki , Helsinki , Finland.,g Unit of Primary Health Care , Kuopio University Hospital , Helsinki and Kuopio , Finland
| | - Kaisa Lakkala
- h Finnish Meteorological Institute , Arctic Research Centre , Sodankylä , Finland
| | - Henna-Reetta Hannula
- h Finnish Meteorological Institute , Arctic Research Centre , Sodankylä , Finland
| | - Esa Turunen
- i Aeronomy division , Sodankylä Geophysical Observatory , Sodankylä , Finland
| | - Heli Viljakainen
- j Children's Hospital, Helsinki University Central Hospital and University of Helsinki , Helsinki , Finland
| | - Timo Reunala
- a Medical School , University of Tampere , Tampere , Finland
| | - Erna Snellman
- a Medical School , University of Tampere , Tampere , Finland.,b Department of Dermatology , Tampere University Hospital , Tampere , Finland
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Patwardhan VG, Mughal ZM, Chiplonkar SA, Webb AR, Kift R, Khadilkar VV, Padidela R, Khadilkar AV. Duration of Casual Sunlight Exposure Necessary for Adequate Vitamin D Status in Indian Men. Indian J Endocrinol Metab 2018; 22:249-255. [PMID: 29911040 PMCID: PMC5972483 DOI: 10.4103/ijem.ijem_473_17] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVES To investigate the duration of casual sunlight ultraviolet-B (UVB) exposure required to maintain optimal Vitamin D status (25-hydroxyvitamin-D [25(OH)D]) >50 nmol/L in urban Indian men, using polysulfone (PSU) dosimeters and a sunlight exposure questionnaire. METHODS In healthy men (aged 40-60 years) from Pune (18.52° N, 73.86° E), India, serum 25(OH)D was measured using enzyme-linked immunosorbent assay. Sunlight exposure was assessed using PSU dosimeter and by questionnaire. RESULTS Of 160 men (48.3 ± 5.6 years), 26.8% were deficient and 40.6% had insufficient Vitamin D concentrations. A hyperbolic function for the relationship between PSU measured sunlight exposure in standard erythema dose (SED) and serum 25(OH)D concentrations (r = 0.87, P < 0.01) revealed that daily exposure of 1 SED was sufficient to maintain serum 25(OH)D concentrations over 50 nmol/L. The curve plateaued around 5 SED (80 nmol/L) and extrapolation of the curve (>5 SED) did not increase 25(OH)D concentrations above 90 nmol/L. Receiver operating curve analysis confirmed that 1 SED-UV exposure was sufficient to maintain 25(OH)D concentrations over 50 nmol/L. Based on the questionnaire data, >1 h of midday casual sunlight exposure was required to maintain serum 25(OH)D concentrations above 50 nmol/L. Duration of sunlight exposure assessed by questionnaire and PSU dosimeter showed a significant correlation (r = 0.517, P < 0.01). CONCLUSION In urban Indian men, >1 h of casual midday sunlight exposure daily was required to maintain serum 25(OH)D concentrations above 50 nmol/L, and >2 h of casual sunlight exposure was needed to maintain 25(OH)D concentrations above 75 nmol/L. Excess sunlight did not increase 25(OH)D linearly. The sunlight exposure questionnaire was validated for use in clinical studies and surveys.
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Affiliation(s)
- Vivek G. Patwardhan
- Growth and Endocrine Unit, Hirabai Cowasji Jehangir Medical Research Institute, Jehangir Hospital, Pune, Maharashtra, India
| | - Zulf M. Mughal
- Department of Pediatrics Endocrinology, Royal Manchester Children's Hospital, Manchester, UK
| | - Shashi A. Chiplonkar
- Growth and Endocrine Unit, Hirabai Cowasji Jehangir Medical Research Institute, Jehangir Hospital, Pune, Maharashtra, India
| | - Ann R. Webb
- School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK
| | - Richard Kift
- School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester, UK
| | - Vaman V. Khadilkar
- Growth and Endocrine Unit, Hirabai Cowasji Jehangir Medical Research Institute, Jehangir Hospital, Pune, Maharashtra, India
| | - Raja Padidela
- Department of Pediatrics Endocrinology, Royal Manchester Children's Hospital, Manchester, UK
| | - Anuradha V. Khadilkar
- Growth and Endocrine Unit, Hirabai Cowasji Jehangir Medical Research Institute, Jehangir Hospital, Pune, Maharashtra, India
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Hoseinzadeh E, Taha P, Wei C, Godini H, Ashraf GM, Taghavi M, Miri M. The impact of air pollutants, UV exposure and geographic location on vitamin D deficiency. Food Chem Toxicol 2018; 113:241-254. [DOI: 10.1016/j.fct.2018.01.052] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 01/18/2018] [Accepted: 01/29/2018] [Indexed: 12/16/2022]
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Jorde R, Grimnes G. Serum cholecalciferol may be a better marker of vitamin D status than 25-hydroxyvitamin D. Med Hypotheses 2018; 111:61-65. [DOI: 10.1016/j.mehy.2017.12.017] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Revised: 11/12/2017] [Accepted: 12/12/2017] [Indexed: 11/15/2022]
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Osima M, Borgen TT, Lukic M, Grimnes G, Joakimsen RM, Eriksen EF, Bjørnerem Å. Serum parathyroid hormone is associated with increased cortical porosity of the inner transitional zone at the proximal femur in postmenopausal women: the Tromsø Study. Osteoporos Int 2018; 29:421-431. [PMID: 29134242 DOI: 10.1007/s00198-017-4298-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 11/01/2017] [Indexed: 01/14/2023]
Abstract
UNLABELLED Serum parathyroid hormone (PTH) was associated with increased bone turnover markers and cortical porosity of the inner transitional zone at the proximal femur. These results suggest that PTH through increased intracortical bone turnover leads to trabecularisation of inner cortical bone in postmenopausal women. INTRODUCTION Vitamin D deficiency leads to secondary hyperparathyroidism and increased risk for fractures, whereas its association with cortical porosity is less clear. We tested (i) whether serum 25-hydroxyvitamin D (25(OH)D) and PTH were associated with cortical porosity and (ii) whether the associations of 25(OH)D) and PTH with fracture risk are dependent on cortical porosity. METHODS This case-control study included 211 postmenopausal women, 54-94 years old, with prevalent fractures and 232 controls from the Tromsø Study. Serum 25(OH)D, PTH, and bone turnover markers (procollagen type I N-terminal propeptide [PINP] and C-terminal cross-linking telopeptide of type I collagen [CTX]) were measured. Femoral subtrochanteric cortical and trabecular parameters were quantified using computed tomography, and femoral neck areal bone mineral density (FN aBMD) was quantified using dual-energy X-ray absorptiometry. RESULTS Compared with controls, fracture cases exhibited reduced serum 25(OH)D and increased PTH, PINP, and CTX, increased femoral subtrochanteric cortical porosity, and reduced cortical thickness and FN aBMD (all, p < 0.05). Serum 25(OH)D was not associated with cortical parameters (all, p > 0.10). PTH was associated with increased PINP, CTX, and cortical porosity of the inner transitional zone and reduced trabecular bone volume/tissue volume and FN aBMD (p ranging from 0.003 to 0.054). Decreasing 25(OH)D and increasing PTH were associated with increased odds for fractures, independent of age, height, weight, calcium supplementation, serum calcium, cortical porosity, and thickness. CONCLUSIONS These data suggest that serum PTH, not 25(OH)D, is associated with increased intracortical bone turnover resulting in trabecularisation of the inner cortical bone; nevertheless, decreasing 25(OH)D) and increasing PTH are associated with fracture risk, independent of cortical porosity and thickness.
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Affiliation(s)
- M Osima
- Department of Community Medicine, Faculty of Health Sciences, UiT, The Arctic University of Norway, N-9037, Tromsø, Norway.
- Department of Orthopaedic Surgery, University Hospital of North Norway, Tromsø, Norway.
| | - T T Borgen
- Department of Rheumatology, Vestre Viken Hospital Trust, Hospital of Drammen, Drammen, Norway
| | - M Lukic
- Department of Community Medicine, Faculty of Health Sciences, UiT, The Arctic University of Norway, N-9037, Tromsø, Norway
| | - G Grimnes
- Department of Medicine, University Hospital of North Norway, Tromsø, Norway
- Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway
| | - R M Joakimsen
- Department of Medicine, University Hospital of North Norway, Tromsø, Norway
- Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway
| | - E F Eriksen
- Department of Endocrinology, Morbid Obesity and Preventive Medicine, Oslo University Hospital, Oslo, Norway
- Institute of Clinical Medicine, University of Oslo, Oslo, Norway
| | - Å Bjørnerem
- Department of Clinical Medicine, UiT The Arctic University of Norway, Tromsø, Norway
- Department of Obstetrics and Gynaecology, University Hospital of North Norway, Tromsø, Norway
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Volcanic dust veils from sixth century tree-ring isotopes linked to reduced irradiance, primary production and human health. Sci Rep 2018; 8:1339. [PMID: 29358711 PMCID: PMC5778132 DOI: 10.1038/s41598-018-19760-w] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Accepted: 12/27/2017] [Indexed: 11/08/2022] Open
Abstract
The large volcanic eruptions of AD 536 and 540 led to climate cooling and contributed to hardships of Late Antiquity societies throughout Eurasia, and triggered a major environmental event in the historical Roman Empire. Our set of stable carbon isotope records from subfossil tree rings demonstrates a strong negative excursion in AD 536 and 541–544. Modern data from these sites show that carbon isotope variations are driven by solar radiation. A model based on sixth century isotopes reconstruct an irradiance anomaly for AD 536 and 541–544 of nearly three standard deviations below the mean value based on modern data. This anomaly can be explained by a volcanic dust veil reducing solar radiation and thus primary production threatening food security over a multitude of years. We offer a hypothesis that persistently low irradiance contributed to remarkably simultaneous outbreaks of famine and Justinianic plague in the eastern Roman Empire with adverse effects on crop production and photosynthesis of the vitamin D in human skin and thus, collectively, human health. Our results provide a hitherto unstudied proxy for exploring the mechanisms of ‘volcanic summers’ to demonstrate the post-eruption deficiencies in sunlight and to explain the human consequences during such calamity years.
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Vitamin D3-fortified milk did not affect glycemic control, lipid profile, and anthropometric measures in patients with type 2 diabetes, a triple-blind randomized clinical trial. Eur J Clin Nutr 2018; 72:1083-1092. [DOI: 10.1038/s41430-017-0062-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2017] [Revised: 08/06/2017] [Accepted: 08/10/2017] [Indexed: 01/29/2023]
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León FR, Burga-León A. UV Radiation Associates With State Income Through Complex Cognitive Ability in the USA. JOURNAL OF INDIVIDUAL DIFFERENCES 2018. [DOI: 10.1027/1614-0001/a000245] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Abstract. Economic development and national intelligence decline with proximity to the equator. Absolute latitude associates with both, income and IQ, but the nature of their relationship is ambiguous. This study applied structural equation modeling using secondary data pertaining to the 48 contiguous states of the United States of America to test the hypothesis that UV (ultraviolet) radiation associates with income through complex cognitive ability vis-a-vis the hypothesis that UV radiation associates with complex cognitive ability through income. The resulting evidence was consistent with the ability → income pathway and unsupportive of the income → ability model. The findings uphold the cognitive capitalism perspective and may throw light on the evolvement of regional differences in the USA.
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Bonjour JP, Dontot-Payen F, Rouy E, Walrand S, Rousseau B. Evolution of Serum 25OHD in Response to Vitamin D 3-Fortified Yogurts Consumed by Healthy Menopausal Women: A 6-Month Randomized Controlled Trial Assessing the Interactions between Doses, Baseline Vitamin D Status, and Seasonality. J Am Coll Nutr 2018; 37:34-43. [PMID: 28976265 PMCID: PMC5817641 DOI: 10.1080/07315724.2017.1355761] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2017] [Accepted: 07/12/2017] [Indexed: 10/25/2022]
Abstract
BACKGROUND Adequate vitamin D status contributes to bone fragility risk reduction and possibly other pathological conditions that occur with aging. In response to pharmaceutical vitamin D3 supplements, several studies have documented the influence of doses, baseline status, and seasonality on serum 25-hydroyvitamin D (s25OHD). OBJECTIVE Using fortified yogurt, we investigated in one randomized controlled trial how both baseline status, as assessed by measuring s25OHD prior the onset of the trial, and the season of enrollment quantitatively influenced the response to the supplemented (Suppl.) of vitamin D3 (VitD3) in healthy community-dwelling women. METHODS A 24-week controlled trial was conducted in menopausal women (mean age: 61.5). Participants were randomized into 3 groups (Gr): Gr.Suppl.0, time controls maintaining dietary habits; Gr.Suppl.5 and Gr.Suppl.10 consuming one and two 125-g servings of VitD3-fortified yogurts with 5- and 10-µg daily doses, respectively. The 16 intervention weeks lasted from early January to mid-August, the 8 follow-up weeks, without product, from late August to mid-October. Before enrollment, subjects were randomized into 2 s25OHD strata: low stratum (LoStr): 25-50 nmol/L; high stratum (HiStr): >50-75 nmol/L. RESULTS All enrolled participants adhered to the protocol throughout the 24-week study: Gr.Suppl.0 (n = 45), Gr.Suppl.5 (n = 44), and Gr.Suppl.10 (n = 44). Over the 16 intervention and 8 follow-up weeks, s25OHD increased in both supplemented groups, more in Gr.Suppl.10 than in Gr.Suppl.5. At the end of the intervention, the subject proportion with s25OHD ≥ 50 nmol/L was 37.8, 54.5, and 63.6% in Gr.Suppl.0, Gr.Suppl.5, and Gr.Suppl.10, respectively. The constant rate of s25OHD per supplemental VitD3 microgram was greater in LoStr than HiStr. The s25OHD increase was greater with late (mid-March) than early (mid-January) inclusion. CONCLUSION This randomized trial demonstrates (1) a dose-dependent s25OHD improvement related to fortified yogurt consumption; (2) an inversely baseline-dependent increase in s25OHD; and (3) a seasonal effect that highlights the importance of VitD3-fortified foods during winter, even at 5 µg/d, in healthy menopausal women.
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Affiliation(s)
- Jean-Philippe Bonjour
- Division of Bone Diseases, University Hospitals and Faculty of Medicine, Geneva, Switzerland
| | | | - Emilien Rouy
- Groupe de Recherche Nutritionnelle, Yoplait, Boulogne, France
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León FR. Diminished UV radiation enhances national cognitive ability, wealth, and institutions through health and education. PERSONALITY AND INDIVIDUAL DIFFERENCES 2018. [DOI: 10.1016/j.paid.2017.08.025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kuter H, Das G, Mughal MZ. Vitamin D status of gastrostomy-fed children with special needs: a cross-sectional pilot study. Acta Paediatr 2017; 106:2038-2041. [PMID: 28862805 DOI: 10.1111/apa.14054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Revised: 07/09/2017] [Accepted: 08/28/2017] [Indexed: 11/28/2022]
Abstract
AIM To assess the vitamin D status of gastrostomy-fed children. METHODS Vitamin D status was measured in 32 children aged five to 16 years recruited from special schools in Manchester, UK (53° 48' N). All children were receiving a nutritionally complete, commercially prepared enteral feed via gastrostomy, and had been established on this regimen for over 12 months. Serum concentrations of 25-hydroxyvitamin D (25OHD) were measured at the end of winter. Children with serum concentrations of 25OHD >50 nmol/L were considered to be sufficient, and those with concentrations <25 nmol/L were considered to be deficient. RESULTS Approximately 83% of subjects had sufficient concentrations of serum 25OHD (>50 nmol/L). One subject was vitamin D deficient (serum 25OHD <25 nmol/L), and four were vitamin D insufficient (serum 25OHD >25 nmol/L - <50 nmol/L). The median vitamin D derived from enteral feeds was 9.45 μg/day; range 3.5-30; 13 children (41%) received less than 10 μg of vitamin D per day from their enteral feed. CONCLUSION Nutritionally complete gastrostomy feeds may be protective against vitamin D deficiency in the majority of children with special needs. We recommend that all children over 1 year of age receive 10 μg (400 IU) of vitamin D, as recommended by the Scientific Advisory Committee on Nutrition (SACN).
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Affiliation(s)
- Hayley Kuter
- Department of Community Paediatric Dietetics; Royal Manchester Children's Hospital; Manchester UK
| | - Geeta Das
- Department of Paediatric Endocrinology; Royal Manchester Children's Hospital; Manchester UK
| | - M. Zulf Mughal
- Department of Paediatric Endocrinology; Royal Manchester Children's Hospital; Manchester UK
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Vitamin D status is associated with underweight and stunting in children aged 6-36 months residing in the Ecuadorian Andes. Public Health Nutr 2017; 21:1974-1985. [PMID: 29162164 DOI: 10.1017/s1368980017002816] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
OBJECTIVE There is limited knowledge on vitamin D status of children residing in the Andes and its association with undernutrition. We evaluated the vitamin D status of children residing in a low socio-economic status (SES) setting in the Ecuadorian Andes and assessed the association between vitamin D status, stunting and underweight. We hypothesized that children who were underweight would have lower serum 25-hydroxyvitamin D (25(OH)D) levels and lower 25(OH)D levels would be associated with a higher risk of stunting. DESIGN We conducted a cross-sectional secondary analysis of a randomized controlled trial, the Vitamin A, Zinc and Pneumonia study. Children had serum 25(OH)D concentrations measured. A sensitivity analysis was undertaken to determine a vitamin D cut-off specific for our endpoints. Associations between serum 25(OH)D and underweight (defined as weight-for-age Z-score≤-1) and stunting (defined as height-for-age Z-score≤-2) were assessed using multivariate logistic regression. SETTING Children residing in five low-SES peri-urban neighbourhoods near Quito, Ecuador. SUBJECTS Children (n 516) aged 6-36 months. RESULTS Mean serum 25(OH)D concentration was 58·0 (sd 17·7) nmol/l. Sensitivity analysis revealed an undernutrition-specific 25(OH)D cut-off of <42·5 nmol/l; 18·6 % of children had serum 25(OH)D<42·5 nmol/l. Children who were underweight were more likely to have serum 25(OH)D<42·5 nmol/l (adjusted OR (aOR)=2·0; 95 % CI 1·2, 3·3). Children with low serum 25(OH)D levels were more likely to be stunted (aOR=2·8; 95 % CI 1·6, 4·7). CONCLUSIONS Low serum 25(OH)D levels were more common in underweight and stunted Ecuadorian children.
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Abstract
BACKGROUND Vitamin D deficiency/insufficiency is associated with hypertension. Blood pressure (BP) and circulating vitamin D concentrations vary with the seasons and distance from the equator suggesting BP varies inversely with the sunshine available (insolation) for cutaneous vitamin D photosynthesis. METHODS To determine if the association between insolation and BP is partly explained by vitamin D, we evaluated 1104 participants in the Reasons for Racial and Geographic Differences in Stroke study whose BP and plasma 25-hydroxyvitamin D [25(OH)D] concentrations were measured. RESULTS We found a significant inverse association between SBP and 25(OH)D concentration and an inverse association between insolation and BP in unadjusted analyses. After adjusting for other confounding variables, the association of solar insolation and BP was augmented, -0.3.5 ± SEM 0.01 mmHg/1 SD higher solar insolation, P = 0.01. The greatest of effects of insolation on SBP were observed in whites (-5.2 ± SEM 0.92 mmHg/1 SD higher solar insolation, P = 0.005) and in women (-3.8 ± SEM 1.7 mmHg, P = 0.024). We found that adjusting for 25(OH)D had no effect on the association of solar insolation with SBP. CONCLUSION We conclude that although 25(OH)D concentration is inversely associated with SBP, it did not explain the association of greater sunlight exposure with lower BP.
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León FR, Hassall C. UV Radiation Is Associated With Latitudinal Trends in Cognitive Ability of White Children in the USA. JOURNAL OF INDIVIDUAL DIFFERENCES 2017. [DOI: 10.1027/1614-0001/a000232] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Abstract. Temperature, geo-residential pattern of subpopulations, prevalence of infectious diseases, and UV radiation have been proposed to explain the declining cognitive ability observed with proximity to the equator in the USA. This study tested the cognitive effects of the four variables. The results reveal that the latitudinal decline of cognitive ability is strongly correlated with the UV Index rather than with the other variables among White children. The decline in measured cognitive ability from north to south is absent among African American and Hispanic children, plausibly because the high levels of skin melanin among these ethnic groups, by absorbing and dissipating light, prevent the occurrence of radiation’s cognitive effects among these populations at USA latitudes. The possible physiological mediators (oxidative stress, folate degradation, sexual hormones) suggest diet, family planning, and educational methods as mitigating strategies; however, specific studies measuring the mediating variables are needed to confirm their role and further strengthen UV radiation as an explanatory concept.
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Affiliation(s)
- Federico R. León
- Vicerectorado de Investigación, Universidad Científica del Sur, Lima, Peru
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