Body weight is simply the weight of any animal, including humans. The term is usually encountered in connection with: *food and feeding behaviour*normal and abnormal growth and development*the physiological and hormonal control of ingestion and digestion*foraging for food in non-human animals*hunger and other motivations to eat*problems in regulating body weight, often resulting in obesity*eating disorders such as anorexia nervosa and bulimia nervosa*effects of disease