Ibn Qayyim in "Medicine of the Prophet" said, “Physical ailments attack and harm the body and alter its normal functions, because of an excess amount of a substance. This type constitutes the majority of diseases and occurs, because of overeating or consuming more than what the body needs, that which brings about little benefit or is not digested easily, or due to complex meals. When [a human] habitually fills his stomach with these types of foods, he will end up with various types of illnesses, some of which take a long time to remedy. On the other hand, when one consumes moderate amounts of food and eats sensibly, the body will get the maximum benefit from this diet, as opposed to when one overeats.”