Gastric bypass and megaloblastic anemia.
D000748:Anemia, Macrocytic / Q000209:etiology*; D000749:Anemia, Megaloblastic / Q000209:etiology*; D005743:Gastrectomy / Q000009:adverse effects*; D006801:Humans; D007437:Intrinsic Factor / Q000172:deficiency*; D009748:Nutrition Disorders / Q000209:etiology*
D007437:Intrinsic Factor