This chapter discusses feeding and eating disorders, which are characterized by disturbed eating behavior and excessive concern about body weight and shape. There is substantial comorbidity of anorexia nervosa and bulimia nervosa. Many patients with bulimia nervosa have other mental health problems related to impulse control as well, such as substance use disorders. Patients with binge-eating disorder experience periods of consumption of objectively large amounts of food accompanied by a feeling of loss of control. Anorexia nervosa is one of the most lethal psychiatric illnesses, as it is associated with mortality rates as high as 5% per decade of illness.