Doubt cast on the benefits of omega-3 for the brain

There are quite a few problems with this study, not least, that it measured blood levels of omega-3 fats only once, at the start of the study. It is possible that blood levels changed over the years if women changed their diets or started or stopped taking fish oil supplements.

Uhh, that's a pretty big issue with the study! Actually, I'd say that it makes the study completely useless. So for 5.9 years, they just assume that the omega-3 levels remained constant? Riiiight.