Deficiency,Vitamin B 12

《英文msh詞典》Deficiency,Vitamin B 12
[入口詞] Deficiency,Vitamin B 12
[主題詞] Vitamin B 12 Deficiency
[英文釋義] A nutritional condition produced by a deficiency of VITAMIN B 12 in the diet,characterized by megaloblastic anemia. Since vitamin B 12 is not present in plants,humans have obtained their supply from animal products,from multivitamin supplements in the form of pills,and as additives to food preparations. A wide variety of neuropsychiatric abnormalities is also seen in vitamin B 12 deficiency and appears to be due to an undefined defect involving myelin synthesis. (From Cecil Textbook of Medicine,19th ed,p848)