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Chen X, Liu H, Liu S, Zhang Z, Li X, Mao J. Excessive dietary iron exposure increases the susceptibility of largemouth bass (Micropterus salmoides) to Aeromonas hydrophila by interfering with immune response, oxidative stress, and intestinal homeostasis. Fish Shellfish Immunol 2024; 147:109430. [PMID: 38325595 DOI: 10.1016/j.fsi.2024.109430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 01/31/2024] [Accepted: 02/04/2024] [Indexed: 02/09/2024]
Abstract
Iron is an essential cofactor in the fundamental metabolic pathways of organisms. Moderate iron intake can enhance animal growth performance, while iron overload increases the risk of pathogen infection. Although the impact of iron on the pathogen-host relationship has been confirmed in higher vertebrates, research in fish is extremely limited. The effects and mechanisms of different levels of iron exposure on the infection of Aeromonas hydrophila in largemouth bass (Micropterus salmoides) remain unclear. In this study, experimental diets were prepared by adding 0, 800, 1600, and 3200 mg/kg of FeSO4∙7H2O to the basal feed, and the impact of a 56-day feeding period on the mortality rate of largemouth bass infected with A. hydrophila was analyzed. Additionally, the relationships between mortality rate and tissue iron content, immune regulation, oxidative stress, iron homeostasis, gut microbiota, and tissue morphology were investigated. The results showed that the survival rate of largemouth bass infected with A. hydrophila decreased with increasing iron exposure levels. Excessive dietary iron intake significantly increased iron deposition in the tissues of largemouth bass, reduced the expression and activity of antioxidant enzymes superoxide dismutase, catalase, and glutathione peroxidase, increased the content of lipid peroxidation product malondialdehyde, and thereby induced oxidative stress. Excessive iron supplementation could influence the immune response of largemouth bass by upregulating the expression of pro-inflammatory cytokines in the intestine and liver, while downregulating the expression of anti-inflammatory cytokines. Additionally, excessive iron intake could also affect iron metabolism by inducing the expression of hepcidin, disrupt intestinal homeostasis by interfering with the composition and function of the gut microbiota, and induce damage in the intestinal and hepatic tissues. These research findings provide a partial theoretical basis for deciphering the molecular mechanisms underlying the influence of excessive iron exposure on the susceptibility of largemouth bass to pathogenic bacteria.
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Affiliation(s)
- Xiaoli Chen
- Guangdong Engineering Research Center of High-Value Utilization and Equipment Development of Marine Biological Resources, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, Guangdong, 511458, China
| | - Hong Liu
- College of Chemistry and Molecular Sciences, Henan University, Kaifeng, 475001, China
| | - Shuangping Liu
- Guangdong Engineering Research Center of High-Value Utilization and Equipment Development of Marine Biological Resources, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, Guangdong, 511458, China; National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China.
| | - Zhifeng Zhang
- Guangdong Engineering Research Center of High-Value Utilization and Equipment Development of Marine Biological Resources, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, Guangdong, 511458, China
| | - Xiong Li
- Guangdong Engineering Research Center of High-Value Utilization and Equipment Development of Marine Biological Resources, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, Guangdong, 511458, China
| | - Jian Mao
- Guangdong Engineering Research Center of High-Value Utilization and Equipment Development of Marine Biological Resources, Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou), Guangzhou, Guangdong, 511458, China; National Engineering Research Center of Cereal Fermentation and Food Biomanufacturing, State Key Laboratory of Food Science and Technology, School of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu, 214122, China.
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Wang M, Chen Z, Zhang Y. Serum Iron Levels, Dietary Iron Intake, and Supplement Use in Relation to Metabolic Syndrome in Adolescents: A Cross-Sectional Study. Biol Trace Elem Res 2024:10.1007/s12011-024-04152-1. [PMID: 38517678 DOI: 10.1007/s12011-024-04152-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2023] [Accepted: 03/15/2024] [Indexed: 03/24/2024]
Abstract
The objective of this study was to investigate the potential associations between serum iron levels, dietary iron intake, and iron supplementation, and the prevalence of metabolic syndrome (MetS) in adolescents A cross-sectional analysis was conducted, utilizing data from adolescents participating in the 2003-2018 cycle of the National Health and Nutrition Examination Survey (NHANES). Odds ratios (ORs) and their corresponding 95% confidence intervals (CIs) pertaining to serum iron, dietary iron, and iron supplementation were derived through multivariate logistic regression models. Additionally, a restricted cubic spline (RCS) regression model was applied to explore the nonlinear relationship between dietary iron and serum iron concerning MetS. The study encompassed 4858 American adolescents aged 12 to 19, among whom 413 (8.5%) manifested MetS. The study cohort exhibited an average age of 15.52 years, comprising 2551 males (52.51%) and 2307 females (47.49%). Relative to individuals in the lowest serum iron quartile, those in the highest quartile for serum iron (OR = 0.33, 95% CI 0.21-0.50), the highest quartile for dietary iron (OR = 0.53, 95% CI 0.32-0.89), and those utilizing iron supplements (OR = 0.61, 95% CI 0.37-0.99) evinced a diminished prevalence of MetS, even post adjustment for potential confounding variables. A non-linear relationship was discerned between serum iron and MetS, exhibiting a statistically significant negative correlation when serum iron concentrations exceeded the inflection point (serum iron = 8.66 µmol/L, P for nonlinear < 0.001). This investigation reveals that higher levels of serum iron, increased dietary iron intake, and the use of iron supplements are linked to a lower prevalence of MetS in US adolescents. These findings suggest that dietary modifications could play a role in promoting the health of adolescents.
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Affiliation(s)
- Meng Wang
- Department of Pediatrics, The Third Affiliated Hospital of Shanghai University, Wenzhou, 325000, People's Republic of China
- Department of Pediatrics, Wenzhou People's Hospital, Wenzhou, 325000, People's Republic of China
- Department of Pediatrics, Wenzhou People's Hospital, Wenzhou Third Clinical Institute Affiliated to Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China
| | - Zhiyuan Chen
- Department of Pediatrics, The Third Affiliated Hospital of Shanghai University, Wenzhou, 325000, People's Republic of China.
- Department of Pediatrics, Wenzhou People's Hospital, Wenzhou, 325000, People's Republic of China.
- Department of Pediatrics, Wenzhou People's Hospital, Wenzhou Third Clinical Institute Affiliated to Wenzhou Medical University, Wenzhou, 325000, Zhejiang, China.
| | - Yuanfeng Zhang
- Department of Urology, Shantou Central Hospital, Shantou, 515000, People's Republic of China
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Rooney DJ, Conway M, O'Keeffe LM, McDonnell CM, Bartels HC, Yelverton C, Segurado R, Mehegan J, McAuliffe FM. Dietary intakes of iron, folate, and vitamin B12 during pregnancy and correlation with maternal hemoglobin and fetal growth: findings from the ROLO longitudinal birth cohort study. Arch Gynecol Obstet 2024; 309:183-193. [PMID: 36708424 PMCID: PMC10770189 DOI: 10.1007/s00404-023-06916-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2022] [Accepted: 01/05/2023] [Indexed: 01/29/2023]
Abstract
PURPOSE Dietary micronutrient intakes of iron, folate and vitamin B12 are known to influence hemoglobin. Low maternal hemoglobin (maternal anemia) has been linked to low birthweight and other adverse health outcomes in the fetus and infant. Our primary aim was to explore relationships between maternal dietary micronutrient intakes, maternal full blood count (FBC) parameters and fetal abdominal circumference (AC) and estimated fetal weight (EFW) growth trajectories. Secondarily, we aimed to assess relationships between maternal dietary micronutrient intakes, maternal hemoglobin values and placental weight and birthweight. METHODS Mother-child pairs (n = 759) recruited for the ROLO study were included in this analysis. Maternal dietary micronutrient intakes were calculated from food diaries completed during each trimester of pregnancy. FBC samples were collected at 13- and 28-weeks' gestation. Fetal ultrasound measurements were recorded at 20- and 34-weeks' gestation. Growth trajectories for AC and EFW were estimated using latent class trajectory mixture models. RESULTS Dietary intakes of iron and folate were deficient for all trimesters. Mean maternal hemoglobin levels were replete at 13- and 28-weeks' gestation. Dietary iron, folate and vitamin B12 intakes showed no associations with fetal growth trajectories, placental weight or birthweight. Lower maternal hemoglobin concentrations at 28 weeks' gestation were associated with faster rates of fetal growth and larger placental weights and birthweights. CONCLUSION The negative association between maternal hemoglobin at 28 weeks' gestation and accelerated fetal and placental growth may be due to greater consumption of maternal iron and hemoglobin by fetuses' on faster growth trajectories in addition to placental biochemical responses to lower oxygen states.
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Affiliation(s)
- David J Rooney
- UCD Perinatal Research Centre, School of Medicine, University College Dublin, National Maternity Hospital, Dublin, Ireland
| | - Marie Conway
- UCD Perinatal Research Centre, School of Medicine, University College Dublin, National Maternity Hospital, Dublin, Ireland
| | | | - Ciara M McDonnell
- UCD Perinatal Research Centre, School of Medicine, University College Dublin, National Maternity Hospital, Dublin, Ireland
- Paediatric Endocrinology and Diabetes, Children's Health Ireland, Children's University Hospital, Dublin, Ireland
| | - Helena C Bartels
- UCD Perinatal Research Centre, School of Medicine, University College Dublin, National Maternity Hospital, Dublin, Ireland
| | - Cara Yelverton
- UCD Perinatal Research Centre, School of Medicine, University College Dublin, National Maternity Hospital, Dublin, Ireland
| | - Ricardo Segurado
- UCD School of Public Health, Physiotherapy and Sports Science, University College Dublin, Dublin, Ireland
| | - John Mehegan
- UCD Perinatal Research Centre, School of Medicine, University College Dublin, National Maternity Hospital, Dublin, Ireland
| | - Fionnuala M McAuliffe
- UCD Perinatal Research Centre, School of Medicine, University College Dublin, National Maternity Hospital, Dublin, Ireland.
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Chen P, Wu S, He J, Sui Y, Li K, Fang A. Long-term dietary iron intake and risk of non-fatal cardiovascular diseases in the China Health and Nutrition Survey. Eur J Prev Cardiol 2023; 30:2032-2043. [PMID: 37494727 DOI: 10.1093/eurjpc/zwad244] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 06/22/2023] [Accepted: 07/22/2023] [Indexed: 07/28/2023]
Abstract
AIMS We aimed to investigate the association of long-term dietary iron intake with the risk of non-fatal cardiovascular diseases (CVDs), myocardial infarction (MI), and stroke in Chinese populations with predominantly plant-based diets by sex. METHODS AND RESULTS A total of 17 107 participants (8569 men and 8538 women) aged 18-80 years in the China Health and Nutrition Survey (CHNS) 1989-2015 were included. Dietary intake was assessed repeatedly by three consecutive 24-h dietary recalls. Cox proportional hazard models were used to estimate hazard ratios (HRs) and 95% confidence intervals (CIs). During a median follow-up of 11.1 years, the adjusted HRs (95% CIs) for non-fatal CVDs risk across quintiles of total iron intake in men were 1.00, 0.65 (0.46-0.93), 0.54 (0.37-0.78), 0.66 (0.46-0.94), 0.69 (0.47-1.03), but no significant association in women. Similar associations were found for stroke risk, but not for MI risk. The dose-response curves for the association of total iron and non-heme iron intake with the risk of non-fatal CVDs and stroke followed a reverse J-shape only in men and similar reverse J-shaped association of heme iron intake with non-fatal CVDs and stroke risk in both men and women (P-non-linearity <0.05). CONCLUSION Moderate dietary iron intake may protect against non-fatal CVDs and stroke, especially in Chinese men consuming plant-based diets. Both quantity and quality of dietary iron intake should be considered in the prevention of non-fatal CVDs due to differences in dietary patterns among diverse populations.
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Affiliation(s)
- Peiyan Chen
- Department of Clinical Nutrition, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, P.R.China
| | - Shangling Wu
- Department of Clinical Nutrition, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, P.R.China
| | - Jingjing He
- Department of Nutrition and Health, Key Laboratory of Precision Nutrition and Food Quality, China Agricultural University, Beijing 100083, P.R.China
| | - Yi Sui
- Department of Clinical Nutrition, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou 510080, P.R.China
| | - Keji Li
- Department of Nutrition and Food Hygiene, School of Public Health, Peking University, 38 Xueyuan Road, Haidian District, Beijing 100191, P.R.China
| | - Aiping Fang
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, 74 Zhongshan Road 2, Yuexiu District, Guangzhou 510080, P.R.China
- Department of Nutrition, Harvard T.H. Chan School of Public Health, 6,55 Huntington Avenue, Boston 02115, USA
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Zierfuss B, Wang Z, Jackson AN, Moezzi D, Yong VW. Iron in multiple sclerosis - Neuropathology, immunology, and real-world considerations. Mult Scler Relat Disord 2023; 78:104934. [PMID: 37579645 DOI: 10.1016/j.msard.2023.104934] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2023] [Revised: 07/30/2023] [Accepted: 08/08/2023] [Indexed: 08/16/2023]
Abstract
Iron is an essential element involved in a multitude of bodily processes. It is tightly regulated, as elevated deposition in tissues is associated with diseases such as multiple sclerosis (MS). Iron accumulation in the central nervous system (CNS) of MS patients is linked to neurotoxicity through mechanisms including oxidative stress, glutamate excitotoxicity, misfolding of proteins, and ferroptosis. In the past decade, the combination of MRI and histopathology has enhanced our understanding of iron deposition in MS pathophysiology, including in the pro-inflammatory and neurotoxicity of iron-laden rims of chronic active lesions. In this regard, iron accumulation may not only have an impact on different CNS-resident cells but may also promote the innate and adaptive immune dysfunctions in MS. Although there are discordant results, most studies indicate lower levels of iron but higher amounts of the iron storage molecule ferritin in the circulation of people with MS. Considering the importance of iron, there is a need for evidence-guided recommendation for dietary intake in people living with MS. Potential novel therapeutic approaches include the regulation of iron levels using next generation iron chelators, as well as therapies to interfere with toxic consequences of iron overload including antioxidants in MS.
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Affiliation(s)
- Bettina Zierfuss
- The Research Center of the Centre Hospitalier de l'Université de Montréal (CRCHUM), Department of Neuroscience, Faculty of Medicine, Université de Montréal, Montréal H2X 0A9, Québec, Canada
| | - Zitong Wang
- Department of Psychiatry, College of Health Sciences, Faculty of Medicine and Dentistry, University of Alberta, Edmonton, Alberta T6G 2B7, Canada
| | - Alexandra N Jackson
- School of Rehabilitation Therapy, Faculty of Health Sciences, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Dorsa Moezzi
- The Hotchkiss Brain Institute and the Department of Clinical Neurosciences, University of Calgary, 3330 Hospital Dr NW, Calgary, Alberta T2N 4N1, Canada
| | - V Wee Yong
- The Hotchkiss Brain Institute and the Department of Clinical Neurosciences, University of Calgary, 3330 Hospital Dr NW, Calgary, Alberta T2N 4N1, Canada.
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Luong R, Ribeiro RV, Rangan A, Naganathan V, Blyth F, Waite LM, Handelsman DJ, Le Couteur DG, Seibel MJ, Hirani V. Haem Iron Intake Is Associated with Increased Major Adverse Cardiovascular Events, All-Cause Mortality, Congestive Cardiac Failure, and Coronary Revascularisation in Older Men: The Concord Health and Ageing in Men Project. J Nutr Health Aging 2023; 27:559-570. [PMID: 37498103 DOI: 10.1007/s12603-023-1945-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2023] [Accepted: 06/22/2023] [Indexed: 07/28/2023]
Abstract
BACKGROUND Nutritional intake can influence major adverse cardiovascular events (MACE). Dietary iron is found in two forms: haem-iron (HI) only found in animal sources and non-haem iron (NHI) present mostly in plant sources. OBJECTIVE We evaluated the associations between dietary iron intakes with MACE and iron status biomarkers. DESIGN Prospective cohort study. SETTING The Concord Health and Ageing in Men Project, Sydney, Australia. PARTICIPANTS 539 community-dwelling older Australian men aged 75 years and older. METHODS Men underwent nutritional assessment using a validated diet history questionnaire. Entries were converted to food groups and nutrients. The dietary calculation was used to derive HI and NHI intakes from total iron intakes. Analyses of iron intakes with iron status biomarkers were conducted using linear regression, and with MACE and individual endpoints were conducted using Cox regression. Five-point MACE comprised of all-cause mortality, myocardial infarction (MI), congestive cardiac failure (CCF), coronary revascularisation, and/or ischaemic stroke. Four-point MACE included the four endpoints of MI, CCF, coronary revascularisation, and/or ischaemic stroke, and excluded all-cause mortality. RESULTS At a median of 5.3 (4.6 - 6.3) years follow-up, the incidences were: 31.2% (n = 168) five-point MACE, 17.8% (n = 96) four-point MACE excluding all-cause mortality, 20.1% (n = 111) all-cause mortality, 11.3% (n = 61) CCF, and 3.1% (n = 15) coronary revascularisation. In adjusted analyses, higher HI intake (per 1mg increment) was associated with increased five-point MACE (HR: 1.45 [95% CI: 1.16, 1.80, P = .001]), four-point MACE excluding all-cause mortality (HR: 1.64 [95% CI: 1.26, 2.15, P <.001]), all-cause mortality (HR: 1.51 [95% CI: 1.15, 1.99, P = .003]), CCF (HR: 2.08 [95% CI: 1.45, 2.98, P <.001]), and coronary revascularisation (HR: 1.89 [95% CI: 1.15, 3.10, P = .012]). Compared with the bottom tertile of NHI intake, the middle tertile of NHI intake was associated with reduced risk of all-cause mortality (HR: 0.56 [95% CI: 0.33, 0.96, P = .035]). Total iron intake was not associated with MACE and individual endpoints. Dietary iron intakes were not associated with serum iron and haemoglobin. CONCLUSION Higher haem iron intake was independently associated with increased risks of five-point MACE, four-point MACE excluding all-cause mortality, all-cause mortality, CCF, and coronary revascularisation in older men over 5 years.
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Affiliation(s)
- R Luong
- Rebecca Luong, Level 4, Charles Perkins Centre D17, University of Sydney, NSW 2006, Australia,
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Sun B, Zhang P, Wei H, Jia R, Huang T, Li C, Yang W. Effect of hemoglobin extracted from Tegillarca granosa on iron deficiency anemia in mice. Food Res Int 2022; 162:112031. [PMID: 36461251 DOI: 10.1016/j.foodres.2022.112031] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Revised: 09/22/2022] [Accepted: 10/03/2022] [Indexed: 12/13/2022]
Abstract
Iron deficiency anemia (IDA) is the most common nutritional deficiency in the world. This study was aimed to evaluate the therapeutic effects of hemoglobin from Tegillarca granosa (T. granosa) on IDA in mice. Mice were randomly divided into five groups: a normal control group, an anemia model group, a positive (FeSO4) control group, a low-dose and high-dose hemoglobin groups. After 4-week iron supplements administration, it was observed that hemoglobin at 2.0 mg iron/kg body weight had better restorative effective on IDA mice than that of FeSO4 with regard to routine blood parameters and serum biochemical indicators. Meanwhile, the IDA-caused alterations of organ coefficients and liver morphology were ameliorated in mice after hemoglobin supplementation in a dose-dependent manner. Further correlation analysis of indicators showed that serum ferritin (iron storage protein) and soluble transferrin receptor (cellular iron uptake membrane glycoprotein) were susceptible to iron deficiency, indicating possibledisorder of iron metabolism caused by IDA. And levels of serum ferritin and soluble transferrin receptor were restored after administration of hemoglobin. These findings confirmed the safety and effectiveness of T. granosa derived hemoglobin in alleviating IDA in mice, suggesting its great potential as an alternative for iron supplementation.
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Guo L, Zhang D, Liu S, Dong Z, Zhou J, Yin Y, Wan D. Maternal iron supplementation during pregnancy affects placental function and iron status in offspring. J Trace Elem Med Biol 2022; 71:126950. [PMID: 35183047 DOI: 10.1016/j.jtemb.2022.126950] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 10/12/2021] [Accepted: 02/10/2022] [Indexed: 01/15/2023]
Abstract
BACKGROUND Iron deficiency and overload during pregnancy damage to maternal and fetal health. Placenta as an organ for the transport of nutrients between mother and fetus protects fetus from the harmful effects of iron deficiency and iron overload through regulation of placental iron homeostasis. METHODS To determine the effect of dietary iron supplementation during pregnancy on reproduction and the mechanism of placental iron regulation, we designed dietary high iron (HI: 344 mg/kg), medium iron (MI: 40 mg/kg), low iron (LI: 2 mg/kg) groups of pregnant female mice fed ferrous citrate 2 weeks before mating to 18.5 days of gestation. RESULTS We find dietary iron supplementation during pregnancy effect maternal liver iron, placental iron, hemoglobin and fetal iron. Dietary iron significantly improves reproductive performance as litter weight and fetal weight. Correlation analysis suggest placental iron increased with liver iron, higher and lower liver iron is not conducive to the accumulation of fetal iron, placental iron deficiency and excess reduce litter weight. Placental transcriptome analysis revealed DEGs with the same trend in HI and LI groups compared with MI group, dietary iron may change biology process of ion transport and gland development in placenta. Granzyme may affect the placental trophoblast structure prior to delivery with iron overload uniquely. CONCLUSION This research highlights the importance of moderate iron supplements in pregnancy due to damage of reproduction by affecting placental function under different dose of maternal iron supplementation.
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Affiliation(s)
- Liu Guo
- Laboratory of Animal Nutritional Physiology and Metabolic Process, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China; University of Chinese Academy of Sciences, Beijing, China
| | - Dongming Zhang
- Laboratory of Animal Nutritional Physiology and Metabolic Process, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China
| | - Shuan Liu
- Laboratory of Animal Nutritional Physiology and Metabolic Process, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China; University of Chinese Academy of Sciences, Beijing, China
| | - Zhenglin Dong
- Laboratory of Animal Nutritional Physiology and Metabolic Process, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China
| | - Jian Zhou
- Laboratory of Animal Nutritional Physiology and Metabolic Process, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China; University of Chinese Academy of Sciences, Beijing, China
| | - Yulong Yin
- Laboratory of Animal Nutritional Physiology and Metabolic Process, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China
| | - Dan Wan
- Laboratory of Animal Nutritional Physiology and Metabolic Process, Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha, Hunan 410125, China.
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Zhang Z, Liu C, Liu M, Zhou C, Li Q, He P, Zhang Y, Li H, Qin X. Dietary Iron Intake and New-Onset Hypertension: A Nationwide Cohort Study from China. J Nutr Health Aging 2022; 26:1016-1024. [PMID: 36437770 DOI: 10.1007/s12603-022-1861-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
OBJECTIVES The relationship of dietary iron intake with the risk of hypertension remains uncertain. We aimed to investigate the prospective association between dietary iron intake and new-onset hypertension among Chinese adults. DESIGN A nationwide cohort study. SETTING Using data from seven rounds of the China Health and Nutrition Survey (CHNS) from 1997 to 2015. PARTICIPANTS A total of 12,245 participants without hypertension at baseline were included in this study. EXPOSURES Dietary intake was measured by three consecutive 24-h dietary recalls combined with a household weighing inventory. MEASUREMENTS The study outcome was new-onset hypertension, defined as systolic blood pressure ≥140 mmHg and/or diastolic blood pressure ≥90 mmHg or diagnosed by physician or currently under antihypertensive treatment during the follow-up. RESULTS During a median follow-up of 6.1 years, 4,304 (35.1%) participants developed hypertension. Overall, there was a U-shaped association between dietary total iron intake and new-onset hypertension (P for nonlinearity <0.001), with the lowest risk observed at 18.2-<22.1 mg/day (quintile 2-3). Similarly, a U-shaped association between dietary nonheme iron intake and new-onset hypertension was found (P for nonlinearity <0.001), with the lowest risk at 17.4-<21.3 mg/day (quintile 2-3). However, the association between dietary heme iron intake and new-onset hypertension followed a L-shape (P for nonlinearity <0.001), and a significantly lower risk of new-onset hypertension was found in participants with quintile 2-5 of dietary heme iron intake (adjusted HR, 0.75; 95% CI: 0.68, 0.82), compared with those in quintile 1 (<0.25 mg/day). CONCLUSIONS The association between dietary iron and new-onset hypertension was nonlinear in Chinese adults, following a U-shape for total or nonheme iron intake, and a L-shape for heme iron intake.
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Affiliation(s)
- Z Zhang
- Xianhui Qin, M.D., Division of Nephrology, Nanfang Hospital, Southern Medical University, Guangzhou 510515, China; ; Phone: 86-20-61641591; Fax: 86-20-87281713
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Hajianfar H, Abbasi K, Azadbakht L, Esmaeilzadeh A, Mollaghasemi N, Arab A. The Association between Maternal Dietary Iron Intake during the First Trimester of Pregnancy with Pregnancy Outcomes and Pregnancy-Related Complications. Clin Nutr Res 2020; 9:52-62. [PMID: 32095448 PMCID: PMC7015730 DOI: 10.7762/cnr.2020.9.1.52] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Revised: 01/16/2020] [Accepted: 01/19/2020] [Indexed: 11/26/2022] Open
Abstract
In this study, we investigated the associations of maternal dietary iron intake during the first trimester of pregnancy and pregnancy outcomes and related complications in pregnant women of Isfahan, Iran. In this prospective study, 812 healthy first-trimester singleton pregnant women were selected randomly from 20 various health centers across Isfahan city during 2015–2016. The maternal dietary iron classified into 2 groups, including heme and non-heme iron. Factors including pre-eclampsia, gestational hypertension, gestational diabetes mellitus, intrauterine growth restriction (IUGR), and nausea and vomiting in pregnancy considered as the pregnancy-related complications. Infant's birth weight, birth height, and birth head circumference were also determined as the pregnancy-outcomes. There was a significant association between total iron consumption and infant head circumference (p = 0.01). Total maternal iron (the sum of heme and non-heme iron) was negatively associated with both infant's birth height (p = 0.006) and birth weight (p = 0.02). Non-heme iron consumption is positively associated with high-risk of IUGR (p = 0.004). Heme intake was associated with an increased risk of maternal fasting blood sugar (FBS) (p = 0.04). Higher heme, non-heme, and total iron intake were associated with lower risk of pre-eclampsia (heme: crude p = 0.05; non-heme iron: adjusted p = 0.02; total iron: adjusted p = 0.05). Maternal total iron intake was directly associated with infant head circumference, whereas, negatively associated with both birth weight and birth height. High non-heme iron intake may increase the risk of IUGR, and a high intake of heme iron may increase FBS.
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Affiliation(s)
- Hossein Hajianfar
- Food Safety Research Center (salt), Semnan University of Medical Sciences, Semnan 35131-19111, Iran.,Food Security Research Center, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran.,Department of Nutrition, School of Nutrition and Food Sciences, Semnan University of Medical Sciences, Semnan 35131-19111, Iran
| | - Khadijeh Abbasi
- Department of Clinical Nutrition, School of Nutrition and Food Science, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran
| | - Leila Azadbakht
- Food Security Research Center, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran.,Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran 14167-53955, Iran.,Diabetes Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran 14167-53955, Iran
| | - Ahmad Esmaeilzadeh
- Food Security Research Center, Isfahan University of Medical Sciences, Isfahan 81746-73461, Iran.,Department of Community Nutrition, School of Nutritional Sciences and Dietetics, Tehran University of Medical Sciences, Tehran 14167-53955, Iran
| | - Negar Mollaghasemi
- Diabetes Research Center, Endocrinology and Metabolism Clinical Sciences Institute, Tehran University of Medical Sciences, Tehran 14167-53955, Iran
| | - Arman Arab
- Student Research Committee, School of Nutrition and Food Sciences, Semnan University of Medical Sciences, Semnan 35131-19111, Iran
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11
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Hare DJ, Braat S, Cardoso BR, Morgan C, Szymlek-Gay EA, Biggs BA. Health outcomes of iron supplementation and/or food fortification in iron-replete children aged 4-24 months: protocol for a systematic review and meta-analysis. Syst Rev 2019; 8:253. [PMID: 31676010 PMCID: PMC6824107 DOI: 10.1186/s13643-019-1185-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 10/05/2019] [Indexed: 01/17/2023] Open
Abstract
BACKGROUND Direct supplementation or food fortification with iron are two public health initiatives intended to reduce the prevalence of iron deficiency (ID) and iron deficiency anaemia (IDA) in 4-24-month-old infants. In most high-income countries where IDA prevalence is < 15%, the recommended daily intake levels of iron from supplements and/or consumption of fortified food products are at odds with World Health Organisation (WHO) guidelines that recommend shorter-term (3 months/year) supplementation only in populations with IDA prevalence > 40%. Emerging concerns about delayed neurological effects of early-life iron overexposure have raised questions as to whether recommended guidelines in high-income countries are unnecessarily excessive. This systematic review will gather evidence from supplementation/fortification trials, comparing health outcomes in studies where iron-replete children did or did not receive additional dietary iron; and determine if replete children at study outset were not receiving additional iron show changes in haematological indices of ID/IDA over the trial duration. METHODS We will perform a systematic review of the literature, including all studies of iron supplementation and/or fortification, including study arms with confirmed iron-replete infants at the commencement of the trial. This includes both dietary iron intervention or placebo/average dietary intakes. One reviewer will conduct searches in electronic databases of published and ongoing trials (Medline, Web of Science, Scopus, CENTRAL, EBSCO [e.g. CINAHL Complete, Food Science and Technology Abstracts], Embase, ClinicalTrials.gov, ClinicalTrialsRegister.eu and who.it/trialsearch), digital theses and dissertations (WorldCat, Networked Digital Library of Theses and Dissertations, DART-Europe E-theses Portal, Australasian Digital Theses Program, Theses Canada Portal and ProQuest). For eligible studies, one reviewer will use a data extraction form, and a second reviewing entered data for accuracy. Both reviewers will independently perform quality assessments before qualitative and, if appropriate, quantitative synthesis as a meta-analysis. We will resolve any discrepancies through discussion or consult a third author to resolve discrepancies. The Preferred Reporting Items for Systematic Reviews and Meta-Analyses statement will be used as the basis for reporting. DISCUSSION Recommended iron supplementation and food fortification practices in high-income countries have been criticised for being both excessive and based on outdated or underpowered studies. This systematic review will build a case for revisiting iron intake guidelines for infants through the design of new trials where health effects of additional iron intake in iron-replete infants are the primary outcome. SYSTEMATIC REVIEW REGISTRATION PROSPERO CRD42018093744.
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Affiliation(s)
- Dominic J. Hare
- The Peter Doherty Institute for Infection and Immunity at The University of Melbourne, 792 Elizabeth Street, Melbourne, VIC 3000 Australia
- Department of Medicine at the Royal Melbourne Hospital and The University of Melbourne, 300 Grattan Street, Parkville, VIC 3052 Australia
- Melbourne Dementia Research Centre at The Florey Institute of Neuroscience and Mental Health and The University of Melbourne, 30 Royal Parade, Parkville, VIC 3052 Australia
| | - Sabine Braat
- Centre for Epidemiology and Biostatistics, Melbourne School of Population and Global Health, University of Melbourne, Melbourne, VIC 3010 Australia
| | - Bárbara R. Cardoso
- Melbourne Dementia Research Centre at The Florey Institute of Neuroscience and Mental Health and The University of Melbourne, 30 Royal Parade, Parkville, VIC 3052 Australia
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Locked Bag 20000, Geelong, VIC 3220 Australia
| | - Christopher Morgan
- Burnet Institute, 85 Commercial Road, Melbourne, VIC 3004 Australia
- Melbourne School of Population and Global Health, The University of Melbourne, 235 Bouverie Street, Carlton, VIC 3053 Australia
- School of Public Health and Preventive Medicine, Monash University, 553 St Kilda Road, Melbourne, VIC 3004 Australia
| | - Ewa A. Szymlek-Gay
- Institute for Physical Activity and Nutrition, School of Exercise and Nutrition Sciences, Deakin University, Locked Bag 20000, Geelong, VIC 3220 Australia
| | - Beverley-Ann Biggs
- The Peter Doherty Institute for Infection and Immunity at The University of Melbourne, 792 Elizabeth Street, Melbourne, VIC 3000 Australia
- Department of Medicine at the Royal Melbourne Hospital and The University of Melbourne, 300 Grattan Street, Parkville, VIC 3052 Australia
- Victorian Infectious Diseases Service, Royal Melbourne Hospital, 300 Grattan Street, Parkville, VIC 3052 Australia
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12
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Ellermann M, Gharaibeh RZ, Maharshak N, Peréz-Chanona E, Jobin C, Carroll IM, Arthur JC, Plevy SE, Fodor AA, Brouwer CR, Sartor RB. Dietary iron variably modulates assembly of the intestinal microbiota in colitis-resistant and colitis-susceptible mice. Gut Microbes 2019; 11:32-50. [PMID: 31179826 PMCID: PMC6973310 DOI: 10.1080/19490976.2019.1599794] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/03/2023] Open
Abstract
Iron deficiency, a common comorbidity of gastrointestinal inflammatory disorders such as inflammatory bowel diseases (IBD), is often treated with oral iron supplementation. However, the safety of oral iron supplementation remains controversial because of its association with exacerbated disease activity in a subset of IBD patients. Because iron modulates bacterial growth and function, one possible mechanism by which iron may exacerbate inflammation in susceptible hosts is by modulating the intestinal microbiota. We, therefore, investigated the impact of dietary iron on the intestinal microbiota, utilizing the conventionalization of germ-free mice as a model of a microbial community in compositional flux to recapitulate the instability of the IBD-associated intestinal microbiota. Our findings demonstrate that altering intestinal iron availability during community assembly modulated the microbiota in non-inflamed wild type (WT) and colitis-susceptible interleukin-10-deficient (Il10-/-) mice. Depletion of luminal iron availability promoted luminal compositional changes associated with dysbiotic states irrespective of host genotype, including an expansion of Enterobacteriaceae such as Escherichia coli. Mechanistic in vitro growth competitions confirmed that high-affinity iron acquisition systems in E. coli enhance its abundance over other bacteria in iron-restricted conditions, thereby enabling pathobiont iron scavenging during dietary iron restriction. In contrast, distinct luminal community assembly was observed with dietary iron supplementation in WT versus Il10-/- mice, suggesting that the effects of increased iron on the microbiota differ with host inflammation status. Taken together, shifts in dietary iron intake during community assembly modulate the ecological structure of the intestinal microbiota and is dependent on host genotype and inflammation status.
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Affiliation(s)
- Melissa Ellermann
- Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC, USA
| | - Raad Z. Gharaibeh
- Bioinformatics Services Division, Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Kannapolis, NC, USA,Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Charlotte, NC, USA
| | - Nitsan Maharshak
- Department of Gastroenterology and Liver Diseases, Tel Aviv Medical Center, Affiliated to the Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel, USA
| | - Ernesto Peréz-Chanona
- Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC, USA
| | - Christian Jobin
- Department of Medicine, University of Florida, Gainesville, FL, USA,Department of Infectious Diseases and Pathology, University of Florida, Gainesville, FL, USA
| | - Ian M. Carroll
- Department of Medicine, University of North Carolina, Chapel Hill, NC, USA,Center for Gastrointestinal Biology and Disease, University of North Carolina, Chapel Hill, NC, USA
| | - Janelle C. Arthur
- Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC, USA,Center for Gastrointestinal Biology and Disease, University of North Carolina, Chapel Hill, NC, USA,Lineberger Comprehensive Cancer Center, University of North Carolina, Chapel Hill, NC, USA
| | - Scott E Plevy
- Immunology Research and Development, Janssen Pharmaceuticals, Spring House, PA, USA
| | - Anthony A. Fodor
- Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Charlotte, NC, USA
| | - Cory R. Brouwer
- Bioinformatics Services Division, Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Kannapolis, NC, USA,Department of Bioinformatics and Genomics, University of North Carolina at Charlotte, Charlotte, NC, USA
| | - R. Balfour Sartor
- Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC, USA,Department of Medicine, University of North Carolina, Chapel Hill, NC, USA,Center for Gastrointestinal Biology and Disease, University of North Carolina, Chapel Hill, NC, USA,CONTACT R. Balfour Sartor Department of Microbiology and Immunology, University of North Carolina, Room 7309A Biomolecular Building, CB# 7032, Chapel Hill, NC 27599-7032, USA
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13
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Ma W, Feng Y, Jia L, Li S, Li J, Wang Z, Chen X, Du H. Dietary Iron Modulates Glucose and Lipid Homeostasis in Diabetic Mice. Biol Trace Elem Res 2019; 189:194-200. [PMID: 30027366 DOI: 10.1007/s12011-018-1446-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 07/12/2018] [Indexed: 12/21/2022]
Abstract
Imbalance of iron homeostasis has been involved in clinical courses of metabolic diseases such as type 2 diabetes mellitus, obesity, and nonalcoholic fatty liver, through mechanisms not yet fully elucidated. Herein, we evaluated the effect of dietary iron on the development of diabetic syndromes in genetically obese db/db mice. Mice (aged 7 weeks) were fed with high-iron (HI) diets (1000 mg/kg chow) or low-iron (LI) diets (12 mg/kg) for 9 weeks. HI diets increased hepatic iron threefold and led to fourfold higher mRNA levels of hepcidin. HI also induced a 60% increase in fasting glucose due to insulin resistance, as confirmed by decreased hepatic glycogen deposition eightfold and a 21% decrease of serum adiponectin level. HI-fed mice had lower visceral adipose tissue mass estimated by epididymal and inguinal fat pad, associated with iron accumulation and smaller size of adipocytes. Gene expression analysis of liver showed that HI diet upregulated gluconeogenesis and downregulated lipogenesis. These results suggested that excess dietary iron leads to reduced mass, increased fasting glucose, decreased adiponectin level, and enhancement of insulin resistance, which indicated a multifactorial role of excess iron in the development of diabetes in the setting of obesity.
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Affiliation(s)
- Wan Ma
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), Ministry of Agriculture, Zhejiang University, Hangzhou, China
- Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
- College of Animal Science, Zhejiang University, Hangzhou, China
| | - Yunfei Feng
- Department of Endocrinology and Metabolism, The First Affiliated Hospital of Medical School of Zhejiang University, Hangzhou, China
| | - Li Jia
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), Ministry of Agriculture, Zhejiang University, Hangzhou, China
- Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
- College of Animal Science, Zhejiang University, Hangzhou, China
| | - Shuhui Li
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), Ministry of Agriculture, Zhejiang University, Hangzhou, China
- Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
- College of Animal Science, Zhejiang University, Hangzhou, China
| | - Jiahui Li
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), Ministry of Agriculture, Zhejiang University, Hangzhou, China
- Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
- College of Animal Science, Zhejiang University, Hangzhou, China
| | - Zhenjie Wang
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), Ministry of Agriculture, Zhejiang University, Hangzhou, China
- Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
- College of Animal Science, Zhejiang University, Hangzhou, China
| | - Xiaoyun Chen
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), Ministry of Agriculture, Zhejiang University, Hangzhou, China
- Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China
- College of Animal Science, Zhejiang University, Hangzhou, China
| | - Huahua Du
- Key Laboratory of Animal Nutrition and Feed Science (Eastern of China), Ministry of Agriculture, Zhejiang University, Hangzhou, China.
- Key Laboratory of Animal Feed and Nutrition of Zhejiang Province, Zhejiang University, Hangzhou, China.
- College of Animal Science, Zhejiang University, Hangzhou, China.
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14
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Yang J, Cheng Y, Pei L, Jiang Y, Lei F, Zeng L, Wang Q, Li Q, Kang Y, Shen Y, Dang S, Yan H. Maternal iron intake during pregnancy and birth outcomes: a cross-sectional study in Northwest China. Br J Nutr 2017; 117:862-71. [PMID: 28393737 DOI: 10.1017/S0007114517000691] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Previous studies have yielded conflicting results on the associations of maternal Fe intake with birth outcomes. This study aimed to investigate the associations between maternal Fe intake (total Fe from diet and supplements, dietary total Fe, haeme Fe, non-haeme Fe and Fe supplements use) and adverse birth outcomes in Shaanxi Province of Northwest China. In all, 7375 women were recruited using a stratified multistage random sampling method at 0-12 months (median 3; 10th-90th percentile 0-7) after delivery. Diets were collected by a validated FFQ and maternal characteristics were obtained via a standard questionnaire. The highest tertile of haeme Fe intake compared with the lowest tertile was negatively associated with low birth weight (LBW) (OR 0·68; 95 % CI 0·49, 0·94), small for gestational age (SGA) (OR 0·76; 95 % CI 0·62, 0·94) and birth defects (OR 0·55; 95 % CI 0·32, 0·89). Maternal haeme Fe intake was associated with a lower risk of intra-uterine growth retardation (IUGR) (medium tertile v. lowest tertile: OR 0·78; 95 % CI 0·61, 0·95; highest tertile v. lowest tertile: OR 0·76; 95 % CI 0·59, 0·93; P trend=0·045). The OR of LBW associated with Fe supplements use were as follows: during pregnancy: 0·72 (95 % CI 0·50, 0·95); in the second trimester: 0·67 (95 % CI 0·42, 0·98); in the third trimester: 0·47 (95 % CI 0·24, 0·93). We observed no associations of total Fe, dietary total Fe or non-haeme Fe intake with birth outcomes. The results suggest that maternal haeme Fe intake is associated with a reduced risk of LBW, SGA, IUGR and birth defects, and Fe supplements use during pregnancy reduces LBW risk.
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15
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Alaunyte I, Stojceska V, Plunkett A. Iron and the female athlete: a review of dietary treatment methods for improving iron status and exercise performance. J Int Soc Sports Nutr 2015; 12:38. [PMID: 26448737 PMCID: PMC4596414 DOI: 10.1186/s12970-015-0099-2] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2015] [Accepted: 09/29/2015] [Indexed: 11/12/2022] Open
Abstract
Iron is a functional component of oxygen transport and energy production in humans and therefore is a critically important micronutrient for sport and exercise performance. Athletes, particularly female athletes participating in endurance sport, are at increased risk of compromised iron status due to heightened iron losses through menstruation and exercise-induced mechanisms associated with endurance activity. Conventionally oral iron supplementation is used in prevention or/and treatment of iron deficiency. However, this approach has been criticised because of the side effects and increased risk of iron toxicity associated with the use of supplements. Thus, more recently there has been a growing interest in using dietary modification rather than the use of supplements to improve iron status of athletes. Dietary iron treatment methods include the prescription of an iron-rich diet, or/and haem iron-based diet, dietary advice counselling and inclusion of novel iron-rich products into the daily diet. Although studies using dietary modification are still scarce, current literature suggests that dietary iron interventions can assist in maintaining iron status in female athletes, especially during intensive training and competition. Future research should focus on the most efficient method(s) of dietary modification for improvement of iron status and whether these approaches can have a favourable impact on sports and exercise performance.
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Affiliation(s)
- Ieva Alaunyte
- Department of Food and Tourism Management, Manchester Metropolitan University, Manchester, M14 6HR UK ; Liverpool Hope University, School of Health Sciences, Liverpool, L16 9JD UK
| | - Valentina Stojceska
- Department of Food and Tourism Management, Manchester Metropolitan University, Manchester, M14 6HR UK ; Brunel University London, College of Engineering, Design and Physical Sciences, Uxbridge, Middlesex UB8 3PH UK ; Brunel University London, Institute of Energy Futures, RCUK Centre for Sustainable Energy Use in Food Chains (CSEF), Uxbridge, Middlesex UB8 3PH UK
| | - Andrew Plunkett
- Department of Food and Tourism Management, Manchester Metropolitan University, Manchester, M14 6HR UK
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