A young man with a long history of obsessional traits and food fads presented with anorexia, vomiting and marked weight loss. He showed little concern for his physical state and his vomiting was frequently witnessed as self-induced. A diagnosis of anorexia nervosa was made and he took his own discharge from hospital. He was readmitted one month later, severely cachectic and with biochemical abnormalities consistent with advanced Addison's disease which was subsequently confirmed. He responded dramatically, both mentally and physically, to corticosteroid therapy. It is likely that anorexia nervosa, relatively rare in males, was a manifestation of the psychological abnormalities commonly seen in severe Addison's disease.