Did you know that peanut butter is a terrific "brain food"? It's a rich source of vitamin E, an antioxident. Antioxidents protect cells from potentially harmful substances you encounter every day in your environment or the food you eat. Peanut butter also contains thiamin (vitamin B1), which helps metabolize carbohydrates, proteins, and fats. Your brain uses carbs for fuel, so eat more peanut butter and get smarter.