A 32-year-old member asked:
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what causes a vitamin b12 deficiency?

3 doctor answers
Dr. Evan Hirsch
8 years experience Integrative Medicine
Multiple causese: There are several causes: low stomach acid, pernicious anemia, poor consumption of foods containing B12 and a genetic predisposition that requires more B12 like mthfr gene defect.
Answered on Jun 29, 2018
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Dr. Jaiprakash Thakor Jairam
Specializes in Healthcare Professional
Various: Probably the most common cause today is a vegetarian or vegan diet,both of which lack B12. Absorption also a crucial cause ,caused by lack of intrinsic factor in stomach(crucial for absorption),use of some acid lowering medication(B12 not released from ingested food)Even under ideal situations ,less then 10%of ingested B12 will be taken up by the body.
Answered on Dec 25, 2018
Dr. Gurmukh Singh
48 years experience Pathology
Agree with Drs, H&J: In addition of the causes they listed, an uncommon cause in the US would be infestation with fish tape worm. Visit this site for info: https://medlineplus.gov/ency/article/000574.htm
Answered on Dec 25, 2018

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