I learned a lot here, but I'm not able to restitute it accurately now: [Dr. Bill Harris on the Omega-3 Index: Increasing Omega-3 to Promote Longevity & Transfor

I learned a lot here, but I'm not able to restitute it accurately now: [Dr. Bill Harris on the Omega-3 Index: Increasing Omega-3 to Promote Longevity & Transform Health ](https://www.youtube.com/watch?v=-f-CFQxaUY4&t=3438s https://www.youtube.com/watch?v=-f-CFQxaUY4&t=3438s). From this and other sources, I can summarize an answer as this: omega-3s in large enough doses, doses rarely used in studies, and especially EPA, is extremely good at reducing inflammation (see "resolvins" and EPA), is a good natural blood thinner and improves blood lipids. The doctor interviewed above thinks that the reduction of inflammation is the main benefit. This finding stuck with me: smokers with a good level of omega-3s had the same risk of death in a 10 year period than non-smokers with low omega-3s. Re: ratios and food sources; of course there are. Seafood often has almost exclusively omega-3s as far as I'm aware, though I'm sure this doesn't apply to farm-raised salmon, for instance. Re: conversion rate from ALA, I couldn't find good references initially, but I've found someone citing a "0.5-20%" range for conversion of ALA to EPA/DHA (and I think the conversion to DHA is even lower, or there was some additional caveat). So that's the point, there is a wide variance.