Eating disorders are complex conditions that arise from long-standing psychological and social factors. The three main types are anorexia nervosa, bulimia, and binge eating disorder. Anorexia is characterized by self-starvation and excessive weight loss. Bulimia involves binge eating followed by purging. Binge eating disorder involves periods of uncontrolled eating beyond feeling full. Treatment must address the psychological, social, and medical aspects of the disorder.