title: Vitamin B12 deficiency due to a low-cholesterol diet in a vegetarian.
mesh_terms: D002791:Cholesterol, Dietary / Q000008:administration & dosage*; D003611:Dairy Products; D014676:Diet, Vegetarian; D006801:Humans; D008297:Male; D008875:Middle Aged; D014806:Vitamin B 12 Deficiency / Q000209:etiology*
chemical_list: D002791:Cholesterol, Dietary