{"url":"https://whatshealthyandwhy.com/omega-3/epa-and-dha","path":"/omega-3/epa-and-dha","alternates":{"json":"https://whatshealthyandwhy.com/api/articles/omega-3/epa-and-dha.json","markdown":"https://whatshealthyandwhy.com/omega-3/epa-and-dha.md"},"topic":{"slug":"omega-3","name":"Omega-3 Fatty Acids","url":"https://whatshealthyandwhy.com/omega-3"},"slug":"epa-and-dha","order":1,"title":"What Are EPA and DHA?","question":"What are EPA and DHA, and can my body make enough?","answer":"EPA and DHA are the omega-3s your body needs most, and it probably cannot make enough from plant ALA.","description":"Understanding the two most important omega-3 fatty acids and what they do in your body","confidence":4,"confidenceNote":"Narrative reviews plus an NIH fact sheet summarizing tracer studies (ALA to EPA 0.2–8%, to DHA under 0.05–4%); no outcome trials are described.","evidenceSummary":{"rctCount":0,"observationalCount":0,"metaAnalysisCount":0,"newestStudyYear":2023},"category":{"categoryTitle":"What's Good For You","categorySlug":"good-for-you","subcategoryName":"Supplements & Vitamins","subcategorySlug":"supplements","url":"https://whatshealthyandwhy.com/explore/good-for-you/supplements"},"actions":["Count on food or supplements for preformed EPA and DHA; ALA from flaxseed and walnuts converts poorly [3].","Look for foods or products that supply both EPA and DHA: EPA helps manage inflammation, DHA builds brain and eye membranes [1][4]."],"cautions":["Not a substitute for medical care if symptoms persist."],"simpleText":"Omega-3 fatty acids come in several forms, but two matter most for your health: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid). Your body can't make enough of these on its own, so you need to get them from food or supplements.\n\nEPA helps manage inflammation throughout your body, while DHA is a major building block of your brain and eyes. Together, they support everything from heart health to mood regulation.\n\nThink of them as essential maintenance tools your body needs but can't manufacture in sufficient quantities.","mediumText":"EPA and DHA are long-chain polyunsaturated fatty acids, each with distinct biological roles. While both belong to the omega-3 family, they serve different functions at the cellular level [1].\n\nEPA (eicosapentaenoic acid) is a 20-carbon fatty acid that serves as a precursor to a class of signaling molecules called eicosanoids. These include prostaglandins and resolvins that help regulate the inflammatory response. When your body has adequate EPA, it produces more anti-inflammatory signals and fewer pro-inflammatory ones [1][2].\n\nDHA (docosahexaenoic acid) is a 22-carbon fatty acid that is a structural component of cell membranes, particularly in the brain and retina. DHA makes up roughly 40% of the polyunsaturated fatty acids in the brain and about 60% of those in the retina [4]. Its accumulation in the fetal brain takes place mainly during the last trimester of pregnancy and continues at very high rates up to the end of the second year of life [4].\n\nYour body can technically convert ALA (alpha-linolenic acid, found in flaxseed and walnuts) into EPA and DHA, but the conversion rate is extremely low -- typically less than 5% for EPA and less than 0.5% for DHA [3]. This is why dietary intake of preformed EPA and DHA is considered important.","deepText":"The biological essentiality of EPA and DHA is well-established across decades of research. Swanson et al. (2012) conducted a comprehensive review demonstrating that EPA and DHA exert health benefits across the entire lifespan, from fetal development through aging, with mechanisms including anti-inflammatory eicosanoid production, cell membrane structural support, and gene expression modulation [1].\n\nThe distinct roles of EPA and DHA arise from their differing chain lengths and double-bond configurations. EPA (20:5n-3) is the primary substrate for Series-3 prostaglandins and Series-5 leukotrienes, which are substantially less inflammatory than their arachidonic acid-derived counterparts. EPA also gives rise to E-series resolvins, specialized pro-resolving mediators that actively terminate inflammatory responses rather than merely suppressing them [2].\n\nDHA (22:6n-3) plays an irreplaceable structural role: it is a structural constituent of membranes specifically in the central nervous system, and its accumulation in the fetal brain takes place mainly during the last trimester of pregnancy and continues at very high rates up to the end of the second year of life [4]. Innis (2008) reviewed the role of dietary omega-3 fatty acids in providing DHA for nervous tissue growth and function [5]. Inadequate intakes of omega-3 fatty acids decrease DHA and increase omega-6 fatty acids in the brain, and decreased DHA in the developing brain leads to deficits in neurogenesis, neurotransmitter metabolism, and altered learning and visual function in animals; epidemiological studies have linked low maternal DHA to an increased risk of poor child neural development [5]. Most of the human data on DHA concern its contribution to optimal visual acuity development [4].\n\nThe NIH Office of Dietary Supplements notes that while ALA-to-DHA conversion exists as a metabolic pathway, it is insufficient to meet physiological demands in most individuals. Stable isotope tracer studies show conversion rates of ALA to EPA at approximately 0.2-8% and ALA to DHA at less than 0.05-4%, with considerable interindividual variability influenced by sex, genetics, and background diet [3]. This evidence underpins the recommendation for direct dietary intake of preformed EPA and DHA.","deepTruncated":false,"references":[{"id":"1","title":"Omega-3 fatty acids EPA and DHA: health benefits throughout life","authors":"Swanson D, Block R, Mousa SA","year":2012,"journal":"Advances in Nutrition","pmid":"22332096","url":"https://pubmed.ncbi.nlm.nih.gov/22332096/"},{"id":"2","title":"Essential Fatty Acids as Functional Components of Foods- a Review","authors":"Kaur N, Chugh V, Gupta AK","year":2014,"journal":"Journal of Food Science and Technology","pmid":"25328170","url":"https://pubmed.ncbi.nlm.nih.gov/25328170/"},{"id":"3","title":"Omega-3 Fatty Acids - Fact Sheet for Health Professionals","authors":"National Institutes of Health, Office of Dietary Supplements","year":2023,"journal":"NIH Office of Dietary Supplements","url":"https://ods.od.nih.gov/factsheets/Omega3FattyAcids-HealthProfessional/"},{"id":"4","title":"DHA effects in brain development and function","authors":"Lauritzen L, Brambilla P, Mazzocchi A, Harsløf LB, Ciappolino V, Agostoni C","year":2016,"journal":"Nutrients","pmid":"26742060","url":"https://pubmed.ncbi.nlm.nih.gov/26742060/"},{"id":"5","title":"Dietary omega 3 fatty acids and the developing brain","authors":"Innis SM","year":2008,"journal":"Brain Research","pmid":"18789910","url":"https://pubmed.ncbi.nlm.nih.gov/18789910/"}],"wordCount":619,"source":{"path":"src/content/topics/omega-3/epa-and-dha.md"},"citeAs":"“What are EPA and DHA, and can my body make enough?.” What's Healthy and Why. https://whatshealthyandwhy.com/omega-3/epa-and-dha","notice":"General information backed by peer-reviewed research, not medical advice."}