Eating disorders leading to obesity or anorexia are widespread and growing in number. Poor success rates of current treatments have led researchers to look for new therapies.

Anorexia is a serious eating disorder that can lead to hospitalization. Those hospitalized for it often require "re-feeding" to recover.

Dangerous weight loss as a result of an eating disorder can get in the way of a normal menstrual cycle. But when treatment works, girls gain weight and get their cycle back.

Getting proper nutrition is important for older people to maintain strength and muscle mass. Frailty can come from not getting enough to eat.