Micronutrients & recovery
The biosynthesis of long-chain n-3 polyunsaturated fatty acids (EPA and DHA) from the plant-based precursor alpha-linolenic acid (ALA) is highly inefficient in healthy adults, with only about 0.2% of plasma ALA converting to EPA.
If you rely on plant sources like flax or walnuts for omega-3s, understand that your body converts very little of them into the active forms (EPA/DHA) your brain and heart need. To ensure adequate levels, incorporate direct sources of long-chain n-3 fatty acids, such as fatty fish or algae-based supplements, rather than relying solely on plant precursors.
The inefficiency of the conversion of 18:3n-3 to 20:5n-3 indicates that the biosynthesis of long-chain n-3 PUFA from alpha-linolenic acid is limited in healthy individuals.
Why this rating
The study uses rigorous stable isotope tracer methodology and compartmental modeling in healthy humans, though the sample size is small (n=8).
Source
Physiological compartmental analysis of α-linolenic acid metabolism in adult humans
Robert J. Pawlosky et al. · Journal of Lipid Research · 2001
DOI 10.1016/s0022-2275(20)31576-5
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