omega-3 fatty acids are essential fats that plays a crucial role in maintaining
supporting neurological function
because the human body cannot produce enough omega-3 on its own, they must be obtained from diet or supplementation
types of omega-3
- plant-derived
- essential for human body, body cannot synthesize it
- marine-derived, microalgae is the only practical source, fish eat microalgae to get epa
- body can convert ~5% from ala
- controls inflammation, blood clotting, vascular tone, mood regulation
- marine-derived, microalgae is the only practical source, fish eat microalgae to get dha
- body can convert ~2% from ala
- needed for brain, eyes, nervous system, sperm and embryo development
chemical properties
solubility: insoluble in water; soluble in organic solvents and fats
structure: polyunsaturated chains with multiple cis double bonds
therapeutic activity
- reduces triglycerides by up to 30% and lowers risk of sudden cardiac death
- regulating cholesterol
- and reducing blood pressure
neuroprotection & mood regulation
- supporting cognitive function and vision
- reduced risk of depression, anxiety
- protecting against age-related cognitive decline
longevity: higher blood omega-3 index is associated with living 4–5 years longer on average due to lower telomere shortening
- balances omega-6 intake and reduces risk of chronic inflammatory conditions: arthritis, metabolic syndrome
- antimicrobial effects and inhibition of microbial biofilm formation
- immune modulation against
- bacteria
- fungi
- viruses
recommended daily intake
| category | epa, mg/day | dha, mg/day | ala, g/day | notes |
|---|---|---|---|---|
| general health | ~250 | ~250 | women: 1.1, men: 1.6 | minimum for adults to support cardiovascular and brain health |
| longevity | ~500 | ~500 | women: 1.1, men: 1.6 | longevity, cognition, and reduced inflammation |
| therapeutic | 1000 | 1000 | women: 1.1 | for high triglycerides, mood disorders, chronic inflammation under medical supervision |
food sources
| food / source | ala, mg | epa, mg | dha, mg | total, mg | notes |
|---|---|---|---|---|---|
| flaxseed, 10 g | ~2300 | 0 | 0 | ~2300 | top concentrated plant source |
| chia seeds, 10 g | ~1750 | 0 | 0 | ~1750 | excellent |
| perilla oil, 10 g | ~9000 | 0 | 0 | ~9000 | oil, very high |
| hemp seeds, 10 g | ~2000 | 0 | 0 | ~2000 | balanced omega-6:3 ratio |
| walnut, 100 g | ~2500 | 0 | 0 | ~2500 | also rich in polyphenols |
| sacha inchi seeds, 100 g | ~7000 | 0 | 0 | ~7000 | tropical nut, very rich |
| fresh purslane, 100 g | ~350 | 0 | 0 | ~350 | top leafy green source |
| diplazium fronds, 100 g | ~300 | 0 | 0 | ~300 | available in southeast asia |
| amaranth leaves, 100 g | ~250 | 0 | 0 | ~250 | common leafy green |
| spinach, 100 g | ~150 | 0 | 0 | ~150 | modest |
| salmon, 100 g | ~0 | ~500 | ~1700 | ~2200 | very rich in dha |
| mackerel, 100 g | ~0 | ~400 | ~700 | ~1100 | one of the top fish sources |
| sardines, 100 g | ~0 | ~500 | ~900 | ~1400 | small fish, lower mercury |
| trout, 100 g | ~0 | ~150 | ~600 | ~750 | cold-water freshwater fish |
| schizochytrium , 1 g | ~0 | ~10 | ~300 | ~300 | dominant dha producer, 40–50% of lipids as dha |
| aurantiochytrium, 1 g | ~0 | ~5 | ~300 | ~300 | similar to schizochytrium, high dha |
| nannochloropsis, 1 g | ~0 | ~30 | ~0 | ~30 | very rich in epa, no dha |
conclusion
for health and longevity, prioritize marine or algal sources of epa and dha, while using plant foods for ala. evolutionarily, our brains and eyes expanded in coastal and riverine environments where fish and shellfish provided a steady stream of these epa/dha fats. so epa/dha from plankton → small fish → larger fish → humans, shaped our cognitive evolution and longevity.
eating 2–3 servings of fatty fish per week, or taking high-quality algal/fish oil supplements, ensures optimal intake
omega-3 are not just nutrients — they're long-term investments in vitality, resilience, and extended healthy lifespan