The primary nutrition for the brain is fatty acids. A good source for fatty acids would be MCT Oil, then virgin organic coconut oil, avocado oil, grass feed butter, and general fat from organic grass feed beef, fish and poultry. Besides being a key protector of the brain fat also plays a key role in the nervous system as well as the peripheral nerves. This is why fat is so highly regarded in native societies.
In General Fat is a major protector against EMF disturbances on your nervous system.
References: Good Fats, Bad Fats by Sally Fallon
Healthy Bio Solutions – Janice Churchill