<qa>  What is anorexia nervosa?The restrictive anorexia nervosa AN in adolescents is an eating disorder with decreased desire to eat wanting following olfactory stimulation. Oxytocin is an hormone involved in the neuromodulation of eating behavior, but also involved in olfactory perception in schizophrenia patients, and in social cognition in patients with autism. Its plasma level was found low in anorexic patients compared to control subjects. 