[Definition and classification of eating disorders]

This paper describes definition and classification of Eating Disorders which centered on the atypical cases. Eating disorders in DSM-IV were further classified into 3 groups. Three groups were Anorexia Nervosa, Bulimia Nervosa and Eating Disorders Not Otherwise Specified. Binge Eating Disorders frequently transfer to obese patient. This disease entity become independent of Anorexia Nervosa and Bulimia Nervosa. Body weight changing trend evaluated not only cross section but also longitudinal observation. There are some experience cases which Anorexia Nervosa cause by diet therapy of obesity patient. A lot of Eating Disorder patients revealed atypical courses during clinical treatment. The symptom of disturbances in the way in which their body weight and sharp could not easy to confirm routine history taking. One type of eating disorders eat throughout the day with no planned mealtimes.