Eating disorders are defined as eating habits that are harmful to an individual's health and involve issues with food and weight. The three most common types are anorexia nervosa, bulimia nervosa, and binge eating disorder, each characterized by distinct patterns of unhealthy eating and weight control behaviors. Eating disorders have serious medical and psychological complications and require professional treatment. Friends and family can help by educating themselves, expressing care and concern privately, and recommending campus or community resources.