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Vitamin D and Northern Natives

Annual average exposure to erythema-inducing UV radiation at ground level. Source: Jablonski & Chaplin, 2000. At high northern latitudes, vitamin D can be obtained only from one’s diet, notably fatty fish. Yet many northern native peoples consume little fish. Have they evolved a different vitamin D metabolism? I’ve just published an article on population differences in vitamin D metabolism, specifically about northern native peoples.
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