Gastric cancer. Pernicious anemia increases the risk of stomach or intestinal cancers. What causes vitamin B12 deficiency?Low levels of vitamin B-12 can be caused by: Diet. Vitamin B-12 is ...

If we ate a varied, healthy diet and were outdoors regularly, supplementation would be limited to those with a proven need.

Dietary management of patients with Vit. B 12 deficiency that cannot be managed by a modification of the normal diet alone (eg, pernicious anemia, malabsorption of Vit. B 12, others).