[devaboone]

This is a correlation. There are lots of conditions that are associated with low Vitamin D. Mortality overall is associated with low Vitamin D. But it doesn't mean that the low Vitamin D caused any of these problems. Having overall poor health leads to Vitamin D deficiency. The increase in mortality is more likely related to your overall health status, not your Vit D status.

[Dahoon]

Do you know anything about the link between schizophrenia and Vit. d?

[tsoukase]

Don't expect to find anything beyond a correlation between VitD levels and any serious disease. In any study that such is found, the substitution had no effect.