Main nutritional resources: sea fishing
The biological priority of our species lies in the brain that makes us unique. Fish has been a part of human diet since our origins, offering the richest and most abundant source of DHA (docosahexaenoic acid), an essential component of the brain.
The brain contains a high level of lipids which are unavailable in food from land ecosystems. It has been suggested that a diet with an insufficient quantity of w3 acids is linked to a reduction in DHA in the brain, and that in present diets, the substitution of essential fatty acids derived from marine foods (w3 and w6) by linoleic vegetable acid (whose transformation into DHA is possible but limited), could be linked to the rise in cerebrovascular disease in our long-lived population. Investigating these suggestions is one of the great challenges for our future.