"If I gain any weight, I'll lose all control." These words, spoken by a 14-year-old anorexia nervosa patient, show just how serious eating disorders can be for teenagers, disturbing numbers of whom are dissatisfied with their bodies. For some, mostly girls, thoughts about food and their bodies consume their lives and lead to such life-threatening eating disorders as anorexia nervosa or bulimia nervosa. This guide to eating disorders for teenagers, their families, and others involved in their lives defines what the diseases are, considers who suffers from them and why, discusses the warning signs and complications, and covers associated disorders. It also provides information on body dysmorphia and the treatment and prevention of eating disorders. Numerous resources that can provide help are listed.