quality:correction, information:classification
Hunger and satiety

There are many physiological mechanisms that control starting and stopping a meal. The control of food intake is a physiologically complex, motivated behavioral system. Hormones such as cholecystokinin, bombesin, neurotensin, anorectin, calcitonin, enterostatin, leptin and corticotropin-releasing hormone have all been shown to suppress food intake.

Eating rapidly leads to obesity and overeating, probably because the feelings of satiety can be slower.