To add some more completely random facts to the thread. All living things are made up of four types of molecules: proteins, carbohydrates, lipids, and nucleic acids. I guess the easiest way to replenish them is to ingest other substances made out of the same thing. The human brain needs energy to run properly. The only things it can use for enrgy are glucose and alcohol which are carbohydrates or fats which are lipids.