> No, ample evidence shows that vitamin D (or vitamin D deficiency at least) is causally related to multiple diseases. Both my statement and yours can be true.

> No, ample evidence shows that vitamin D (or vitamin D deficiency at least) is causally related to multiple diseases. Both my statement and yours can be true. Having a deficiency in an essential nutrient can be causal for bad outcomes while, at the same time, having the correct amount or excess can be non-causal but correlated with positive health outcomes.