Vitamin B 12 Deficiency

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)

Also Known As:

Vitamin B12 Deficiency; Deficiency, Vitamin B 12; Deficiency, Vitamin B12; Deficiencies, Vitamin B12; Vitamin B12 Deficiencies

Nutritional and Metabolic Diseases: 15
- Nutrition Disorders: 404
  - Malnutrition: 20403
    - Deficiency Diseases: 514
      - Avitaminosis: 1294
        Vitamin B Deficiency: 65
        Vitamin B 12 Deficiency: 2140

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