Anorexia

Food intake is regulated by the two centers of the hypothalamus, the "feeding center" on the ventral side and the "satisfactory center" on the ventral side. The latter produces a feeling of satiety after eating and can inhibit the former's activities. The brain-gut peptide cholecystokinin (CCK) appears to have a satiety effect and may be involved in the regulation of feeding behavior. Appetite disorders, including lack of appetite, hyper appetite, and abnormal appetite, can be caused by diseases of the digestive system, but also by diseases of the system other than the digestive system or disorders of the central diet.