Some plant foods, like flaxseed, chia seeds, and walnuts, provide ALA (alpha-linolenic acid), which is considered a precursor omega-3.
In order to deliver the well-known heart and brain benefits associated with omega-3s, ALA must first be converted by the body into the longer-chain forms: EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid).
The challenge is that this conversion process is inefficient. Research suggests that humans typically convert less than 10% of ALA into EPA, and an even smaller percentage into DHA (Burdge & Calder, 2005). Factors such as age, genetics, overall diet, and omega-6 intake can further reduce conversion efficiency.
This means that relying on ALA alone may not reliably deliver meaningful levels of EPA and DHA — the forms most directly associated with cardiovascular support, cognitive function, and inflammatory balance.