http://www.psychologytoday.com/articles/200310/what-is-good-brain-food
The health of your brain depends not only on how much (or little) fat you eat but on what kind it is. Intellectual performance requires the specific type of fat found most commonly in fish, known as omega-3 fatty acids. Even diets that adhere to commonly recommended levels of fats, but the wrong kind, can undermine intelligence. What makes this finding awkward is that certain oils widely touted as healthy for the heart are especially troublesome for the mind.
Omega-3s are known to be particularly crucial constituents of the outer membrane of brain cells. It is through the fat-rich cell membrane that all nerve signals must pass. In addition, as learning and memory forge new connections between nerve cells, new membranes must be formed to sheathe them. All brain cell membranes continuously need to refresh themselves with a new supply of fatty acids. A growing amount of research suggests that the omega-3s are best suited for optimal brain function.
