The Irish playwright George Bernard Shaw (1856-1950) once wrote: “No diet will remove all the fat from your body because the brain is entirely fat. Without a brain, you might look good, but all you could do is run for public office.” He was not right in one thing: the brain is just about 60% fat. And of that percentage, the biggest portion comes from n-3 polyunsaturated fatty acids (PUFAs).