This chapter explores the difference between disordered eating and eating disorders. It describes the eating disorders anorexia nervosa, bulimia nervosa and related conditions. The chapter also describes the health risks associated with eating disorders and management options in treating eating disorders. Disordered eating includes behaviours or relationships with food that are obsessive, irregular or chaotic, such as chronic restrained eating, compulsive eating and habitual dieting. Children may develop disordered eating of various types, including food fads, food refusal or food aversion. Anorexia nervosa varies widely in severity. In mildly affected individuals counselling may be effective, whereas for those severely affected specialist clinics or even hospitalisation may be required. It is important that the problems of anorexia and bulimia nervosa are recognised in the community by parents, teachers, doctors, dietitians and other professionals working with young people. Eating disorders are difficult to treat and anorexia nervosa may be life-threatening.