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What are the causes of vitamin d and iron deficiency besides nutrition?

3 doctors weighed in
Dr. James Shoemaker
General Practice
2 doctors agree

In brief: Darkness & Bleeding

Avoiding sunlight causes vitamin d deficiency--rickets tends to occur in northern climes in the winter. The main non-nutritional cause of iron deficiency is bleeding, including menstrual blood loss, which is why women are at greater risk for this than men.
Men can become iron deficient due to unseen blood loss from stomach ulcers or intestinal cancers.

In brief: Darkness & Bleeding

Avoiding sunlight causes vitamin d deficiency--rickets tends to occur in northern climes in the winter. The main non-nutritional cause of iron deficiency is bleeding, including menstrual blood loss, which is why women are at greater risk for this than men.
Men can become iron deficient due to unseen blood loss from stomach ulcers or intestinal cancers.
Dr. James Shoemaker
Dr. James Shoemaker
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