Alterations of serotonin (5-HT) and dopamine (DA) activity may contribute to extremes of appetitive behaviours in anorexia nervosa (AN) and bulimia nervosa (BN), through effects on inhibitory and reward neural pathways. To avoid the confounding effects of malnutrition, and because they have behaviours and neural circuit alterations relevant for this study, we will study 25 recovered (REC) restricting-type AN, 25 REC bulimic-type AN (AN-BN), 25 REC BN, and 25 control women (CW). This 5 year study, of women 18 to 45 years old, will employ positron emission tomography (PET) imaging with radioligands for the 5-HT transporter ([11C]DASB) and DA D2/D3 receptors ([11C]raclopride).