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FreydisTit t1_itwpzpw wrote

Reply to comment by senorkose in Vitamin D deficiency linked to premature death. Over a 14-year follow up period, researchers found that the risk for death significantly decreased with increased vitamin D concentrations, with the strongest effects seen among those with severe deficiencies. by Wagamaga

According to this rebuttal of the study, only 12.7% of the participants tested for vitamin D levels prior to the study (61%) were baseline deficient in Vitamin D. So 39% of participants weren't tested for baseline levels of vitamin D. Also, they did not account for body weight, other Vitamin D supplementation, sunlight exposure, or clothing coverage.

I think the Vital study was examining vitamin D supplementation in general. Not a great design.

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