Disturbance in eating or feeding, as evidenced by one or more of: Substantial weight loss (or, in children, absence of expected weight gain) Nutritional deficiency Dependence on a feeding tube or dietary supplements Significant psychosocial interference Disturbance not due to unavailability of food, or to observation of cultural norms Disturbance not due to anorexia nervosa or bulimia nervosa, and no evidence of disturbance in experience of body shape or weight Disturbance not better explained by another medical condition or mental disorder, or when occurring concurrently with another condition, the disturbance exceeds what is normally caused by that condition