The study looked at how adding a type of fatty acid called α-linolenic acid to people's diets affected their levels of another fatty acid called eicosapentaenoic acid (EPA). They found that after taking α-linolenic acid, EPA levels in people's blood varied a lot, with some seeing a decrease and others a big increase. The researchers also checked if the starting levels of fatty acids in people's blood affected how much their EPA levels changed, but they didn't find a clear link. This means that adding α-linolenic acid to your diet can lead to different changes in EPA levels, and more research is needed to understand why.