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Nutrition

Omega-3 and Omega-6 Essential Fatty Acids

Evidence-grounded — sourced from Fysiqal's fitness knowledge graph· 2 min read
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In one line

Omega-3 and omega-6 are polyunsaturated fats the body cannot make; most people get plenty of omega-6 but too little long-chain omega-3 (EPA/DHA) from fish.

Detail

Essential fatty acids must come from food. There are two families:

  • Omega-3: the plant form ALA (alpha-linolenic acid; flaxseed, chia, walnuts) and the long-chain marine forms EPA and DHA (fatty fish — salmon, sardines, mackerel). EPA/DHA support cardiovascular health, are structural in the brain and retina, and modulate inflammation. The body converts ALA to EPA/DHA only inefficiently (a few percent).
  • Omega-6: chiefly linoleic acid (vegetable oils, nuts, seeds), abundant in typical Western diets.

Intake guidance: there is no formal US RDA for EPA/DHA, but health organizations broadly suggest about 250–500 mg/day of combined EPA + DHA for general health, roughly equivalent to two servings of fatty fish per week. People with established heart disease may be advised toward ~1 g/day EPA + DHA, preferably from fish, under medical guidance. A common upper bound from supplements is 3,000 mg/day (FDA considers up to 3 g/day GRAS), with higher therapeutic doses only under supervision. Vegans and vegetarians rely on ALA plus algae-derived EPA/DHA and are a key at-risk group for low long-chain omega-3 status (see plant-based-diet).

Key facts

  • Two essential families: omega-3 (ALA; EPA/DHA) and omega-6 (linoleic acid).
  • EPA/DHA from fatty fish; ALA→EPA/DHA conversion is inefficient.
  • General target ~250–500 mg/day EPA+DHA (~2 fatty-fish servings/week).
  • Heart disease: ~1 g/day EPA+DHA under guidance; supplement ceiling ~3 g/day (FDA GRAS).
  • Vegans/vegetarians at risk; algae oil is a vegan EPA/DHA source.

Connections

  • dietary-fats — omega-3/6 are polyunsaturated fats.
  • plant-based-diet — completeness considerations for omega-3.
  • supplements-skeptical-note — fish-oil dosing and evidence.
  • mediterranean-diet — pattern emphasizing fish and unsaturated fat.
SourceCurrent guideline bodies
NIH Office of Dietary Supplements, Omega-3 Fatty Acids fact sheet. American Heart Association guidance on EPA/DHA. US FDA GRAS notice (≤3 g/day EPA+DHA).
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Educational content only — not medical advice. Always consult a qualified professional for individualized guidance, especially around injury, pregnancy, or medical conditions.

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