Causes include increased exercise and physical activity,
growth spurt,
hormone imbalances( hyperthyroidism or hyperadrenalism), pregnancy or at certain times during the menstrual cycle,uncontrolled diabetes,depression,bulimia nervosa( an eating disorder that usually result in eating binges),certain drugs or medications(like antihistamines, steroids, marijuana, or large amounts of alcohol) and damage to an area of the brain called the hypothalamus(This is a rare condition).