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These include- Aged over 75 Decreased stomach acid Frequent use of antacids Autoimmune conditions affecting the stomach High doses of folic acid Stomach surgery Prolonged use of metformin Adoption of a vegan or vegetarian diet Excessive alcohol consumption How Does Vitamin B12 Benefit Your Body
A swollen thyroid, or goiter, may also develop, making swallowing or breathing difficult for the patient
doi: 10.1038/nature09973 293 WhillierS.RaftosJ
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