An epidemiological study of eating disorders in a northern area of Japan

A total of 97 patients with eating disorders who visited the Department of Neuro-Psychiatry, Yamagata University Hospital, between 1978 and 1992 were studied. According to the diagnostic criteria of DSM-III-R, there were 48 cases of anorexia nervosa (AN). 38 cases of bulimia nervosa (BN) and 11 cases with both AN and BN. Both the number of patients and the ratio to all out-patients in each year increased four times during the period 1988-1992 compared to the previous period. With regard to their places of residence, the number of patients with AN and with BN from every district appeared to increase at almost the same rate, although the majority of the patients were from medium-sized cities. These findings may indicate that eating disorders are influenced by urbanization.