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by spuz 2213 days ago
The percentage of the population that is vitamin D deficient can't affect its correlation with disease. It's perfectly possible that after this, vitamin D is added to tap water such that very few people are deficient but the correlation with deficiency and disease would be unchanged.
1 comments

> It's perfectly possible that after this, vitamin D is added to tap water

Vitamin D is fat soluble, not water soluble.