Poor nutrition and: Vitamin B12 comes form nutrition - legumes, meat, vegetable.. and Vitamin D comes form sun exposure.Some rare conditions prevent absorption of vitamin B12 in stomach ( Pernicious anemia) or some surgical stomach procedures ( bariatric surgery) . it is recommended to avoid sun exposure due to risk of skin cancer and take Vit D supplement daily .Balanced nutrition is the key. if concern see Doc.
Answered 6/15/2016
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A doctor has provided 1 answer
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