“…Although anorexia and bulimia nervosa are categorized as eating disorders, pathological eating behavior has tended to be viewed as derivative and not the primary pathophysiology. In the past decade, a better understanding of the modulation of feeding behavior has generated a body of knowledge that allows us to test the hypothesis of whether or not eating‐disorder patients have a defect in some system that modulates feeding behavior 3,4 . This paper focuses on whether a disturbance of serotonin activity contributes to the psychopathology of eating disorders and whether such alterations are state‐ or trait‐related.…”