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Dempsey M, Rockwell MS, Wentz LM. The influence of dietary and supplemental omega-3 fatty acids on the omega-3 index: A scoping review. Front Nutr 2023; 10:1072653. [PMID: 36742439 PMCID: PMC9892774 DOI: 10.3389/fnut.2023.1072653] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 01/02/2023] [Indexed: 01/20/2023] Open
Abstract
Introduction The majority of the population do not consume adequate omega-3 fatty acids (n-3 FA), leading to global deficiencies, as evidenced by poor omega-3 status. An indicator of overall n-3 FA status, omega3-index (O3i) ≥8% has been associated with reduced risk of chronic disease, most notably cardiovascular disease. Thus, a synthesis of current research summarizing the effects of n-3 FA intake on O3i is warranted to develop and refine clinical recommendations. The purpose of this scoping review was to evaluate the effect of n-3 FA interventions and estimate sufficient n-3 FA intake to improve O3i to meet recommendations. Methods Search criteria were human studies published in English from 2004 to 2022 that assessed O3i at baseline and following an n-3 FA intervention. Results Fifty-eight studies that met inclusion criteria were identified. Protocols included fish consumption, fortified foods, combined eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) supplements, supplements of single n-3 FA (alpha linolenic acid (ALA), EPA, DHA, etc.), and supplements providing multiple n-3 FA. Dietary supplements varied in chemical composition; the most common were triglycerides or ethyl esters. The lowest supplementation protocol was 100 mg/d, and the largest was 4,400 mg/d EPA and DHA. Supplementation time period ranged from 3 weeks to 1 year. At baseline, three study samples had mean O3i >8%, although many intervention protocols successfully increased O3i. Discussion Generally, the lowest doses shown to be effective in raising O3i to recommended levels were >1,000 mg/d of combination DHA plus EPA for 12 weeks or longer. Supplements composed of triglycerides were more bioavailable and thus more effective than other formulas. Based on the data evaluated, practical recommendations to improve O3i to ≥8% are consumption of 1,000-1,500 mg/d EPA plus DHA as triglycerides for at least 12 weeks.
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Affiliation(s)
- Meghan Dempsey
- Department of Nutrition and Healthcare Management, Appalachian State University, Boone, NC, United States
| | - Michelle S. Rockwell
- Department of Human Nutrition, Foods, and Exercise, Virginia Polytechnic Institute and State University, Blacksburg, VA, United States
| | - Laurel M. Wentz
- Department of Nutrition and Healthcare Management, Appalachian State University, Boone, NC, United States,*Correspondence: Laurel M. Wentz ✉
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Davinelli S, Medoro A, Intrieri M, Saso L, Scapagnini G, Kang JX. Targeting NRF2-KEAP1 axis by Omega-3 fatty acids and their derivatives: Emerging opportunities against aging and diseases. Free Radic Biol Med 2022; 193:736-750. [PMID: 36402440 DOI: 10.1016/j.freeradbiomed.2022.11.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 11/01/2022] [Accepted: 11/10/2022] [Indexed: 11/18/2022]
Abstract
The transcription factor NRF2 and its endogenous inhibitor KEAP1 play a crucial role in the maintenance of cellular redox homeostasis by regulating the gene expression of diverse networks of antioxidant, anti-inflammatory, and detoxification enzymes. Therefore, activation of NRF2 provides cytoprotection against numerous pathologies, including age-related diseases. An age-associated loss of NRF2 function may be a key driving force behind the aging phenotype. Recently, numerous NRF2 inducers have been identified and some of them are promising candidates to restore NRF2 transcriptional activity during aging. Emerging evidence indicates that omega-3 (n-3) polyunsaturated fatty acids (PUFAs) and their electrophilic derivatives may trigger a protective response via NRF2 activation, rescuing or maintaining cellular redox homeostasis. In this review, we provide an overview of the NRF2-KEAP1 system and its dysregulation in aging cells. We also summarize current studies on the modulatory role of n-3 PUFAs as potential agents to prevent multiple chronic diseases and restore the age-related impairment of NRF2 function.
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Affiliation(s)
- Sergio Davinelli
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, Campobasso, Italy
| | - Alessandro Medoro
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, Campobasso, Italy
| | - Mariano Intrieri
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, Campobasso, Italy
| | - Luciano Saso
- Department of Physiology and Pharmacology "Vittorio Erspamer", Sapienza University of Rome, Rome, Italy
| | - Giovanni Scapagnini
- Department of Medicine and Health Sciences "V. Tiberio", University of Molise, Campobasso, Italy.
| | - Jing X Kang
- Laboratory for Lipid Medicine and Technology, Department of Medicine, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
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Walchuk C, House JD, Aliani M, Suh M. Lutein and docosahexaenoic acid enriched egg consumption improves retina function in healthy Caucasian older adults. J Funct Foods 2022. [DOI: 10.1016/j.jff.2021.104913] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
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Huang CP, Lin YW, Huang YC, Tsai FJ. Mitochondrial Dysfunction as a Novel Target for Neuroprotective Nutraceuticals in Ocular Diseases. Nutrients 2020; 12:nu12071950. [PMID: 32629966 PMCID: PMC7400242 DOI: 10.3390/nu12071950] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 06/23/2020] [Accepted: 06/29/2020] [Indexed: 12/12/2022] Open
Abstract
The eyes require a rich oxygen and nutrient supply; hence, the high-energy demand of the visual system makes it sensitive to oxidative stress. Excessive free radicals result in mitochondrial dysfunction and lead to retinal neurodegeneration, as an early stage of retinal metabolic disorders. Retinal cells are vulnerable because of their coordinated interaction and intricate neural networks. Nutraceuticals are believed to target multiple pathways and have shown neuroprotective benefits by scavenging free radicals and promoting mitochondrial gene expression. Furthermore, encouraging results demonstrate that nutraceuticals improve the organization of retinal cells and visual functions. This review discusses the mitochondrial impairments of retinal cells and the mechanisms underlying the neuroprotective effects of nutraceuticals. However, some unsolved problems still exist between laboratory study and clinical therapy. Poor bioavailability and bioaccessibility strongly limit their development. A new delivery system and improved formulation may offer promise for health care applications.
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Affiliation(s)
- Chun-Ping Huang
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung 404, Taiwan;
| | - Yi-Wen Lin
- Graduate Institute of Acupuncture Science, College of Chinese Medicine, China Medical University, Taichung 404, Taiwan;
| | - Yu-Chuen Huang
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung 404, Taiwan;
- Department of Medical Research, China Medical University Hospital, Taichung 404, Taiwan
- Correspondence: (Y.-C.H.); (F.-J.T.)
| | - Fuu-Jen Tsai
- School of Chinese Medicine, College of Chinese Medicine, China Medical University, Taichung 404, Taiwan;
- Department of Medical Research, China Medical University Hospital, Taichung 404, Taiwan
- Children’s Hospital of China Medical University, Taichung 404, Taiwan
- Department of Medical Genetics, China Medical University Hospital, Taichung 404, Taiwan
- Correspondence: (Y.-C.H.); (F.-J.T.)
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Walchuk C, Suh M. Nutrition and the aging retina: A comprehensive review of the relationship between nutrients and their role in age-related macular degeneration and retina disease prevention. ADVANCES IN FOOD AND NUTRITION RESEARCH 2020; 93:293-332. [PMID: 32711865 DOI: 10.1016/bs.afnr.2020.04.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Age-related macular degeneration (AMD) is the leading cause of severe vision loss in developed countries and is highly common among aging individuals. Considering the rate at which the global population is aging, the increasing prevalence of AMD and age-related eye disease is cause for concern. AMD is associated with the degeneration of the macula, the most central region of the retina, leading to a loss of central vision. A wide array of research has focused on the ability of lipid soluble nutrients to prevent and mitigate the harmful effects of AMD. These nutrients in question tend to be highly saturated within retinal tissues including the carotenoids lutein and zeaxanthin and the polyunsaturated fatty acid docosahexaenoic acid (DHA). Additionally, the unique presence of very long chain polyunsaturated fatty acids (VLCPUFAs, C24-C36) in the retina may be essential to prevent retinal degeneration as demonstrated by abnormal retinal functioning in the absence of these novel fatty acids. Existing literature has suggested that lutein, zeaxanthin and DHA consumption tend to enhance the health of the retina, protecting against the development of AMD. However, little improvement to the previously deteriorated retina is demonstrated and more research is required to understand the role of these nutrients in the retina and for the prevention of AMD. Considering the global impact of AMD and age-related eye disease, utilizing nutrients to prevent the formation of these debilitating diseases is a highly affordable and promising strategy.
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Affiliation(s)
- Chelsey Walchuk
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, Canada; Division of Neurodegenerative Disorders, Canadian Centre for Agri-Food Research in Health and Medicine, St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, MB, Canada
| | - Miyoung Suh
- Department of Food and Human Nutritional Sciences, University of Manitoba, Winnipeg, MB, Canada; Division of Neurodegenerative Disorders, Canadian Centre for Agri-Food Research in Health and Medicine, St. Boniface Hospital Albrechtsen Research Centre, Winnipeg, MB, Canada.
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Qiu S, Wei Y, Zhou X, Jiang Z, Zhang T, Jiang X, Zhang S. Intravitreal injection of docosahexaenoic acid attenuated photoreceptor cell injury in a NaIO 3 -induced age-related macular degeneration rat model. Neurosci Lett 2017; 657:53-61. [DOI: 10.1016/j.neulet.2017.07.041] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Revised: 07/07/2017] [Accepted: 07/24/2017] [Indexed: 12/11/2022]
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Broadhead GK, Grigg JR, Chang AA, McCluskey P. Dietary modification and supplementation for the treatment of age-related macular degeneration. Nutr Rev 2015; 73:448-62. [PMID: 26081455 DOI: 10.1093/nutrit/nuv005] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Age-related macular degeneration (AMD) causes a significant proportion of visual loss in the developed world. Currently, little is known about its pathogenesis, and treatment options are limited. Dietary intake is one of the few modifiable risk factors for this condition. The best-validated therapies remain oral antioxidant supplements based on those investigated in the Age-Related Eye Disease Study (AREDS) and the recently completed Age-Related Eye Disease Study 2 (AREDS2). In this review, current dietary guidelines related to AMD, along with the underlying evidence to support them, are presented in conjunction with current treatment recommendations. Both AREDS and AREDS2 are discussed, as are avenues for further research, including supplementation with vitamin D and saffron. Despite the considerable disease burden of atrophic AMD, few effective therapies are available to treat it, and further research is required.
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Affiliation(s)
- Geoffrey K Broadhead
- G.K. Broadhead, J. Grigg, A.A Chang, and P. McCluskey are with the Save Sight Institute, Department of Ophthalmology, The University of Sydney, Sydney, New South Wales, 2000, Australia. G.K. Broadhead and A.A Chang are with the Sydney Institute of Vision Science, Sydney, New South Wales, 2000, Australia.
| | - John R Grigg
- G.K. Broadhead, J. Grigg, A.A Chang, and P. McCluskey are with the Save Sight Institute, Department of Ophthalmology, The University of Sydney, Sydney, New South Wales, 2000, Australia. G.K. Broadhead and A.A Chang are with the Sydney Institute of Vision Science, Sydney, New South Wales, 2000, Australia
| | - Andrew A Chang
- G.K. Broadhead, J. Grigg, A.A Chang, and P. McCluskey are with the Save Sight Institute, Department of Ophthalmology, The University of Sydney, Sydney, New South Wales, 2000, Australia. G.K. Broadhead and A.A Chang are with the Sydney Institute of Vision Science, Sydney, New South Wales, 2000, Australia
| | - Peter McCluskey
- G.K. Broadhead, J. Grigg, A.A Chang, and P. McCluskey are with the Save Sight Institute, Department of Ophthalmology, The University of Sydney, Sydney, New South Wales, 2000, Australia. G.K. Broadhead and A.A Chang are with the Sydney Institute of Vision Science, Sydney, New South Wales, 2000, Australia
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Bilateral lacrimal drainage obstruction and its association with secondary causes. Ophthalmic Plast Reconstr Surg 2014; 30:152-6. [PMID: 24614546 DOI: 10.1097/iop.0000000000000034] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
PURPOSE Etiologies of lacrimal obstruction requiring a dacryocystorhinostomy (DCR) have been reviewed previously but most commonly are thought to result from "primary acquired" nasolacrimal duct obstruction, a process of chronic inflammation in a narrowed duct. The authors have observed that secondary causes are frequently associated with bilateral lacrimal outflow disease. The purpose of this study is to investigate this relationship to help the clinician prioritize which patients to evaluate for secondary causes. METHODS This is a retrospective case-controlled review of patients who underwent bilateral DCR from 1986 to 2012 at this institution. They are compared with an age and gender-matched control group who underwent unilateral DCR. Statistical analysis was undertaken using the Pearson chi-square test for p value, except for age, which used the Wilcoxon rank sum test. Logistic regression was used for comparing prevalence of secondary issues in bilateral disease versus unilateral disease, with age as covariate. RESULTS Two hundred thirty-five patients underwent bilateral (91) or unilateral DCR (144). Twice as many patients undergoing bilateral DCR had an underlying secondary cause compared with the patients undergoing unilateral DCR. (38%, 19%, p= 0.001, odds ratio 2.59). In patients <50, the odds ratio of a secondary cause in bilateral disease would be 5.34 compared with patients older than 80. (p = 0.0002) Patients in the bilateral DCR group underwent revisions at more than twice the rate as patients in the unilateral DCR group (26%, 12%, p = 0.007). CONCLUSIONS Ophthalmologists should have a high index of suspicion for secondary conditions underlying bilateral lacrimal outflow obstruction, especially in patients <50. These patients should undergo laboratory workup and intraoperative biopsy. They should also be counseled regarding a higher failure rate.
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Georgiou T, Neokleous A, Nicolaou D, Sears B. Pilot study for treating dry age-related macular degeneration (AMD) with high-dose omega-3 fatty acids. PHARMANUTRITION 2014. [DOI: 10.1016/j.phanu.2013.10.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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