[phoinix]

I think all the brain matter can be composed by the body itself, indcluding DHA or DHEA. It is just easier to get big quantities from exogenous sources. The world champion of chess, Carlsen, comes from Norway where they produce the most salmon in the world. You can buy salmon everywhere, relatively cheap comparing to other places.

However i am a vegan for 4 years, and i think my brain never worked better. Everything that comes from animal sources, can be substituted by plants, or from endogenous production of the body.

How about our brain got evolved because of our vocal chords? I didn't see anyone considering that hypothesis. I can personally can imitate many animals, birds or whatever. My ancestors, ancient Greeks said that music is the ultimate art. How about we are making music for millions of years, and our brain processing that information, got so much ahead of all the other organisms?