Integrated Complex Treatment for Extreme Anorexia Nervosa; An Interdisciplinary Treatment Concept of the University Hospital Zurich The serious physical mental and psychosocial morbidity due to anorexia nervosa is often perceived by sufferers as less serious than from their environment. Doctors and other healthcare professionals are therefore confronted with the difficulty that urgent medical treatment is considered as unnecessary or even threatening by those affected. Although patients with anorexia nervosa usually wish to improve their condition, they are usually only able to tolerate treatment aimed at normalizing eating behavior and gaining weight in response to high external pressure. In view of this situation, an interdisciplinary team with experience in these treatments is required to treat these patients. Close cooperation is necessary to ensure a supporting treatment framework.