http://well.blogs.nytimes.com/2012/0...els-the-brain/
Exercise fuels the brain.
"“glycogen supercompensation in some brain loci” is “enhanced in rats receiving carbohydrates immediately after exhaustive exercise.” So for people, that might mean that after a run or other exercise that is prolonged or strenuous enough to leave you tired, a bottle of chocolate milk or a banana might be just the thing your brain is needing."
Well, they didn't say ice cream, but they should know better.