“…around 100 grams of good protein per day optimizes everything else being equal, optimizes your mental functioning. But there was a study of pilots done by the Pentagon in which high-fat diet was the best for their attention and avoidance of accidents in interpreting information. And thiamine, vitamin B1, is used to produce energy from glucose, and it can make a tremendous difference. If you've been at all deficient in it, it's just spectacular what a supplement of 10 milligrams or more of B1 can do for your mental focus and clarity.”