The feeling of hunger is a message sent to your brain by your body. The message being that the blood is missing the nutritive materials. The bodies of all living beings must maintain a state of metabolic equilibrium. This means there has to be a certain balance and control over our intake of fuel and its use. To regulate our body weight we have thirst, hunger and appetite. In the brain, we have a hunger center. It acts like a brake on the activities of the stomach and intestines. When the blood has sufficient nutritive materials, the hunger center stops the activities of the stomach and intestines. But when there is a lack of nutrition, the intestines and stomach become active. That is precisely why you hear your stomach rumbling when you are hungry. When you feel hungry, your body is crying out for fuel. A really hungry person will eat any kind of food. It is your appetite that sees to it that you choose the mixed diet that your body requires.