Currently, topics that NCCIH-funded researchers are investigating include:
- How changes in the intake of omega-3s and other fatty acids affect patients with migraine
- Which patients with depression might respond to EPA
- How genetic differences affect the fate of omega-3s in the body
- The effects of flaxseed, which is rich in ALA, in an animal model of ovarian cancer.
More To Consider
Take charge of your health—talk with your health care providers about any complementary health approaches you use. Together, you can make shared, well-informed decisions.
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Key References
- Age-Related Eye Disease Study 2 research group. Lutein + zeaxanthin and omega-3 fatty acids for age-related macular degeneration: the Age-Related Eye Disease Study 2 (AREDS2) randomized clinical trial.JAMA. 2013;309(19):2005-2015.
- Appleton KM, Sallis HM, Perry R, et al. Omega-3 fatty acids for depression in adults. Cochrane Database of Systematic Reviews. 2015;(11):CD004692. Accessed at https://www.cochranelibrary.com on November 28, 2016.
- Aung T, Halsey J, Kromhout D, et al. Associations of omega-3 fatty acid supplement use with cardiovascular disease risks. Meta-analysis of 10 trials involving 77,917 individuals. JAMA Cardiology. 2018;3(3):225-234.
- Balk EM, Adam GP, Langberg V, et al. Omega-3 Fatty Acids and Cardiovascular Disease: An Updated Systematic Review. Evidence Report/Technology Assessment no. 223. Rockville, MD: Agency for Healthcare Research and Quality; 2016. AHRQ publication no. 16-E002-EF.
- Bisgaard H, Stokholm J, Chawes BL, et al. Fish oil-derived fatty acids in pregnancy and wheeze and asthma in offspring. New England Journal of Medicine. 2016;375(26):2530-2539.
- Brasky TM, Darke AK, Song X, et al. Plasma phospholipid fatty acids and prostate cancer risk in the SELECT trial.Journal of the National Cancer Institute. 2013;105(15):1132-1141.
- Chew EY, Clemons TE, Agrón E, et al. Effect of omega-3 fatty acids, lutein/zeaxanthin, or other nutrient supplementation on cognitive function. The AREDS2 randomized clinical trial.JAMA. 2015;314(8):791-801.
- Dry Eye Assessment and Management Study Research Group. N-3 fatty acid supplementation for the treatment of dry eye disease. New England Journal of Medicine. 2018;378(18):1681-1690.
- Grey A, Bolland M. Clinical trial evidence and use of fish oil supplements.JAMA Internal Medicine. 2014;174(3):460-462.
- Grosso G, Pajak A, Marventano S, et al. Role of omega-3 fatty acids in the treatment of depressive disorders: a comprehensive meta-analysis of randomized clinical trials.PLoS One. 2014;9(5):e96905.
- He K, Song Y, Daviglus ML, et al. Accumulated evidence on fish consumption and coronary heart disease mortality: a meta-analysis of cohort studies.Circulation. 2004;109(22):2705-2711.
- Kwak SM, Myung S-K, Lee YJ, et al. Efficacy of omega-3 fatty acid supplements (eicosapentaenoic acid and docosahexaenoic acid) in the secondary prevention of cardiovascular disease: a meta-analysis of randomized, double-blind, placebo-controlled trials.Archives of Internal Medicine. 2012;172(9):686-694.
- Lee Y-H, Bae S-C, Song G-G. Omega-3 polyunsaturated fatty acids and the treatment of rheumatoid arthritis: a meta-analysis. Archives of Medical Research. 2012;43(5):356-362.
- Miles EA, Calder PC. Influence of marine n-3 polyunsaturated fatty acids on immune function and a systematic review of their effects on clinical outcomes in rheumatoid arthritis. British Journal of Nutrition. 2012;107(Suppl 2):S171-S184.
- Newberry SJ, Chung M, Booth M, et al. Omega-3 Fatty Acids and Maternal and Child Health: An Updated Systematic Review. Evidence Report/Technology Assessment No. 224. Rockville, MD: Agency for Healthcare Research and Quality; 2016. AHRQ publication no. 16(17)-E003-EF.
- Office of Dietary Supplements. Omega-3 Fatty Acids: Fact Sheet for Health Professionals. Office of Dietary Supplements website. Accessed at https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/ on November 23, 2016.
- Orchard TS, Pan X, Cheek F, et al. A systematic review of omega-3 fatty acids and osteoporosis.British Journal of Nutrition. 2012;107(Suppl 2):S253-S260.
- Querques G, Souied EH. The role of omega-3 and micronutrients in age-related macular degeneration.Survey of Ophthalmology. 2014;59(5):532-539.
- Rizos EC, Ntzani EE, Bika E, et al. Association between omega-3 fatty acid supplementation and risk of major cardiovascular disease events: a systematic review and meta-analysis. JAMA. 2012;308(10):1024-1033.
- Sublette ME, Ellis SP, Geant AL, et al. Meta-analysis of the effects of eicosapentaenoic acid (EPA) in clinical trials in depression.Journal of Clinical Psychiatry. 2011;72(12):1577-1584.
- Sydenham E, Dangour AD, Lim WS. Omega 3 fatty acid for the prevention of cognitive decline and dementia. Cochrane Database of Systematic Reviews. 2012;(6):CD005379. Accessed at https://www.cochranelibrary.com on December 5, 2016.
- Szymanski KM, Wheeler DC, Mucci LA. Fish consumption and prostate cancer risk: a review and meta-analysis.American Journal of Clinical Nutrition. 2010;92(5):1223-1233.
Other References
- Anandan C, Nurmatov U, Sheikh A. Omega 3 and 6 oils for primary prevention of allergic disease: systematic review and meta-analysis. Allergy. 2009;64(6):840-848.
- Bath-Hextall FJ, Jenkinson C, Humphreys R, et al. Dietary supplements for established atopic eczema. Cochrane Database of Systematic Reviews. 2012;(2):CD005205. Accessed at http://www.cochranelibrary.com on November 29, 2016.
- Bhargava R, Kumar P, Kumar M, et al. A randomized controlled trial of omega-3 fatty acids in dry eye syndrome. International Journal of Ophthalmology. 2013;6(6):811-816.
- Black LI, Clarke TC, Barnes PM, Stussman BJ, Nahin RL. Use of complementary health approaches among children aged 4?17 years in the United States: National Health Interview Survey, 2007?2012. National health statistics reports; no 78. Hyattsville, MD: National Center for Health Statistics. 2015.
- Bloch MH, Qawasmi A. Omega-3 fatty acid supplementation for the treatment of children with attention-deficit/hyperactivity disorder symptomatology: systematic review and meta-analysis. Journal of the American Academy of Child and Adolescent Psychiatry. 2011;50(10):991-1000.
- Burckhardt M, Herke M, Wustmann T, et al. Omega-3 fatty acids for the treatment of dementia. Cochrane Database of Systematic Reviews. 2016;(4):CD009002. Accessed at http://www.cochranelibrary.com on November 25, 2016.
- Cabré E, Mañosa M, Gassull MA. Omega-3 fatty acids and inflammatory bowel diseases – a systematic review. British Journal of Nutrition. 2012;107(Suppl 2):S240-S252.
- Campbell A, Price J, Hiatt WR. Omega-3 fatty acids for intermittent claudication. Cochrane Database of Systematic Reviews. 2013;(7):CD003833. Accessed at http://www.cochranelibrary.com on November 29, 2016.
- Casula M, Soranna D, Catapano AL, et al. Long-term effect of high dose omega-3 fatty acid supplementation for secondary prevention of cardiovascular outcomes: a meta-analysis of randomized placebo controlled trials. Atherosclerosis. Supplements. 2013;14(2):243-251.
- Chowdhury R, Stevens S, Gorman D, et al. Association between fish consumption, long chain omega 3 fatty acids, and risk of cerebrovascular disease: systematic review and meta-analysis. BMJ. 2012;345:e6698.
- Chua ME, Sio MC, Sorongon MC, et al. Relationship of dietary intake of omega-3 and omega-6 fatty acids with risk of prostate cancer development: a meta-analysis of prospective studies and review of literature. Prostate Cancer. 2012;2012:826254.
- Clarke TC, Black LI, Stussman BJ, Barnes PM, Nahin RL. Trends in the use of complementary health approaches among adults: United States, 2002–2012. National health statistics reports; no 79. Hyattsville, MD: National Center for Health Statistics. 2015.
- Cooper RE, Tye C, Kuntsi J, et al. The effect of omega-3 polyunsaturated fatty acid supplementation on emotional dysregulation, oppositional behaviour and conduct problems in ADHD: a systematic review and meta-analysis. Journal of Affective Disorders. 2016;190:474-482.
- Covington MB. Omega-3 fatty acids. American Family Physician. 2004;70(1):133-140.
- Daviglus ML, Bell CC, Berrettini W, et al. National Institutes of Health State-of-the-Science Conference statement: preventing Alzheimer disease and cognitive decline. Annals of Internal Medicine. 2010;153(3):176-181.
- De Ley M, de Vos R, Hommes DW, et al. Fish oil for induction of remission in ulcerative colitis. Cochrane Database of Systematic Reviews. 2007;(4):CD005986 [edited 2008]. Accessed at http://www.cochranelibrary.com on December 5, 2016.
- Dennis CL, Dowswell T. Interventions (other than pharmacological, psychosocial or psychological) for treating antenatal depression. Cochrane Database of Systematic Reviews. 2013;(7):CD006795. Accessed at http://www.cochranelibrary.com on November 28, 2016.
- Farinotti M, Vacchi L, Simi S, et al. Dietary interventions for multiple sclerosis. Cochrane Database of Systematic Reviews. 2012;(12):CD004192. Accessed at http://www.cochranelibrary.com on November 29, 2016.
- Fusar-Poli P, Berger G. Eicosapentaenoic acid interventions in schizophrenia: meta-analysis of randomized, placebo-controlled studies. Journal of Clinical Psychopharmacology. 2012;32(2):179-185.
- Gillies D, Sinn JK, Lad SS, et al. Polyunsaturated fatty acids (PUFA) for attention deficit hyperactivity disorder (ADHD) in children and adolescents. Cochrane Database of Systematic Reviews. 2012;(7):CD007986. Accessed at http://www.cochranelibrary.com on December 5, 2016.
- Gunaratne AW, Makrides M, Collins CT. Maternal prenatal and/or postnatal n-3 long chain polyunsaturated fatty acids (LCPUFA) supplementation for preventing allergies in early childhood. Cochrane Database of Systematic Reviews. 2015;(7):CD010085. Accessed at http://www.cochranelibrary.com on November 28, 2016.
- Harris WS. Omega-3 fatty acids. In: Coates PM, Betz JM, Blackman MR, et al., eds. Encyclopedia of Dietary Supplements. 2nd ed. New York, NY: Informa Healthcare; 2010:577-586.
- Hartweg J, Perera R, Montori V, et al. Omega-3 polyunsaturated fatty acids (PUFA) for type 2 diabetes mellitus. Cochrane Database of Systematic Reviews. 2008;(1):CD003205 [edited 2009]. Accessed at http://www.cochranelibrary.com on November 29, 2016.
- He XX, Wu XL, Chen RP, et al. Effectiveness of omega-3 polyunsaturated fatty acids in non-alcoholic fatty liver disease: a meta-analysis of randomized controlled trials. PLoS One. 2016;11(10):E0162368.
- Hu FB, Manson JE. Omega-3 fatty acids and secondary prevention of cardiovascular disease—is it just a fish tale? Archives of Internal Medicine. 2012;172(9):694-696.
- James S, Montgomery P, Williams K. Omega-3 fatty acids supplementation for autism spectrum disorders (ASD). Cochrane Database of Systematic Reviews. 2011;(11):CD007992. Accessed at http://www.cochranelibrary.com on November 29, 2016.
- Khoueiry G, Abi Rafeh N, Sullivan E, et al. Do omega-3 polyunsaturated fatty acids reduce risk of sudden cardiac death and ventricular arrhythmias? A meta-analysis of randomized trials. Heart & Lung. 2013;42(4):251-256.
- Kotwal S, Jun M, Sullivan D, et al. Omega 3 fatty acids and cardiovascular outcomes: systematic review and meta-analysis. Circulation Cardiovascular Quality and Outcomes. 2012;5(6):808-818.
- Lev-Tzion R, Griffiths AM, Leder O, et al. Omega 3 fatty acids (fish oil) for maintenance of remission in Crohn’s disease. Cochrane Database of Systematic Reviews. 2014;(2):CD006320. Accessed at http://www.cochranelibrary.com on December 5, 2016.
- Liu A, Ji J. Omega-3 essential fatty acids therapy for dry eye syndrome: a meta-analysis of randomized controlled studies. Medical Science Monitor. 2014;20:1583-1589.
- Mazereeuw G, Lanctôt KL, Chau SA, et al. Effects of ω-3 fatty acids on cognitive performance: a meta-analysis. Neurobiology of Aging. 2012;33(7):1482.e17-29.
- Miller BJ, Murray L, Beckmann MM, et al. Dietary supplements for preventing postnatal depression. Cochrane Database of Systematic Reviews. 2013;(10):CD009104. Accessed at http://www.cochranelibrary.co on November 28, 2016.
- Mocking RJ, Harmsen I, Assies J, et al. Meta-analysis and meta-regression of omega-3 polyunsaturated fatty acid supplementation for major depressive disorder. Translational Psychiatry. 2016;6:e756.
- Oliver C, Watson H. Omega-3 fatty acids for cystic fibrosis. Cochrane Database of Systematic Reviews. 2016;(1):CD002201. Accessed at http://www.cochranelibrary.com on November 29, 2016.
- Parker HM, Johnson NA, Burdon CA, et al. Omega-3 supplementation and non-alcoholic fatty liver disease: a systematic review and meta-analysis. Journal of Hepatology. 2012;56(4):944-951.
- Pirillo A, Catapano AL. Update on the management of severe hypertriglyceridemia—focus on free fatty acid forms of omega-3. Drug Design, Development and Therapy. 2015;9:2129-2137.
- Rayapudi S, Schwartz SG, Wang X, et al. Vitamin A and fish oils for retinitis pigmentosa. Cochrane Database of Systematic Reviews. 2013;(12):CD008428. Accessed at http://www.cochranelibrary.com on December 5, 2016.
- Raz R, Gabis L. Essential fatty acids and attention-deficit–hyperactivity disorder: a systematic review. Developmental Medicine and Child Neurology. 2009;51(8):580-592.
- Richardson AJ. Omega-3 fatty acids in ADHD and related neurodevelopmental disorders. International Review of Psychiatry. 2006;18(2):155-172.
- Scherer DJ, Nicholls SJ. Lowering triglycerides to modify cardiovascular risk: will icosapent deliver? Vascular Health and Risk Management. 2015;11:203-209.
- Stoffers J, Völlm BA, Rücker G, et al. Pharmacological interventions for borderline personality disorder. Cochrane Database of Systematic Reviews. 2010;(6):CD005653. Accessed at http://www.cochranelibrary.com on November 29, 2016.
- Turner D, Steinhart AH, Griffiths AM. Omega 3 fatty acids (fish oil) for maintenance of remission in ulcerative colitis. Cochrane Database of Systematic Reviews. 2007;(3):CD006443 [edited 2008]. Accessed at http://www.cochranelibrary.coon December 5, 2016.
- U.S. Department of Health and Human Services and U.S. Department of Agriculture. Dietary Guidelines for Americans: 2015–2020. 8th ed. Health.gov Web site. Accessed at https://health.gov/dietaryguidelines/2015/guidelines/ on December 5, 2016.
- U.S. Food and Drug Administration and U.S. Environmental Protection Agency. Eating Fish: What Pregnant Women and Parents Should Know. U.S. Food and Drug Administration Web site. Accessed at https://www.fda.gov/food/foodborneillnesscontaminants/metals/ucm393070.htm on December 5, 2016.
- Villani AM, Crotty M, Cleland LG, et al. Fish oil administration in older adults: is there potential for adverse events? A systematic review of the literature. BMC Geriatrics. 2013;13:41.
- Wen YT, Dai JH, Gao Q. Effects of omega-3 fatty acid on major cardiovascular events and mortality in patients with coronary heart disease: a meta-analysis of randomized controlled trials. Nutrition, Metabolism, and Cardiovascular Diseases. 2014;24(5):470-475.
- Yassine HN, Braskie MN, Mack WJ, et al. Association of docosahexaenoic acid supplementation with Alzheimer disease stage in apolipoprotein E ε4 carriers: a review. JAMA Neurology. 2017;74(3):339-347.
- Zhang M, Picard-Deland E, Marette A. Fish and marine omega-3 polyunsaturated fatty acid consumption and incidence of type 2 diabetes: a systematic review and meta-analysis. International Journal of Endocrinology. 2013;2013:501015.
- Zheng J, Huang T, Yu Y, et al. Fish consumption and CHD mortality: an updated meta-analysis of seventeen cohort studies. Public Health Nutrition. 2012;15(4):725-737.
- Zheng T, Zhao J, Wang Y, et al. The limited effect of omega-3 polyunsaturated fatty acids on cardiovascular risk in patients with impaired glucose metabolism: a meta-analysis. Clinical Biochemistry. 2014;47(6):369-377.
Acknowledgments
NCCIH thanks D. Craig Hopp, Ph.D., and David Shurtleff, Ph.D., NCCIH, for their contributions to the 2018 update of this publication.
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