Anorexia true Lack of desire to eat (loss of appetite). Please note that this term does not refer to the condition of anorexia nervosa, which is a disorder characterized by an obsessive desire to lose weight by refusing to eat. The term is considered more severe than "Poor appetite". HP:0002039 Deliberately not eating SNOMEDCT_US:79890006 Obsessive dieting Refusing to eat Anorexia UMLS:C0003123 Abdominal symptom