90% of the omega-3 fatty acid in the human brain is docosahexaenoic acid (DHA).  It is essential (similar to all vitamins), because the human body cannot produce it itself.  More and more research is being done which reveals how vital this compound is for humans.  For example, it is known that during pregnancy a disproportionate…

http://www.stuff.co.nz/dominion-post/national/2987821/Save-the-planet-eat-a-dog