Omega-3 Intake Needs
Conversion of plant omega-3s (flax, chia, walnuts) into usable EPA/DHA varies 5–10 fold between people. Poor converters need fish or algae oil to get the brain, heart, and anti-inflammatory benefits—plants alone won't cut it.
What this measures
How your DNA shapes omega-3 intake needs.
The body can technically convert plant-based ALA omega-3 into the active forms EPA and DHA — but the conversion is inefficient even with optimal genetics. FADS1 and FADS2 code for the desaturase enzymes that drive this conversion; ELOVL2 handles the elongation step. Variants across all three meaningfully change how much EPA and DHA actually appear in tissues from a given dietary input.
Carriers of common FADS1/FADS2 reduced-activity variants are associated with significantly lower conversion efficiency — sometimes under 5% of ALA reaching EPA, and a fraction of that reaching DHA. Carriers tend to need direct dietary EPA/DHA (from fatty fish or supplements) to maintain meaningful tissue levels.
Fatty fish (salmon, sardines, mackerel) deliver EPA/DHA directly and bypass the conversion bottleneck. Algae oil is the vegan equivalent at therapeutic doses. Omega-6 intake competes with the same FADS enzymes — high seed-oil intake reduces what little conversion the body manages. Inflammation, alcohol, and trans fats all impair the pathway further.
"Eat more flax" and "take fish oil" aren’t interchangeable for carriers of the low-conversion variant pattern. Knowing where conversion sits changes whether plant omega-3 sources cover the need or whether direct EPA/DHA is the only way to actually move tissue levels.
Omega-3 Intake Needs is one specific finding in this system. Your Genomic Lifestyle Optimization Report shows where your variants place you on the macronutrients and metabolic optimization spectrum — and what you can do about it: it renders as a dark card with a color marker calibrated to your variants, opening with the gene mechanism and closing with a practical, mechanism-led recommendation.
Want to see what a real Mosaic dark card looks like? Walk through a sample report →
In context
Fats: the 6-insight cluster.
Omega-3 Intake Needs is one finding in a tightly-related cluster. Mosaic sequences the other 5 alongside it so you see the whole biology — not an isolated data point.
Questions people ask
About Omega-3 Intake Needs.
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