It's hard to keep up with advances in scientific knowledge -- this paper seems to hypothesize that Vitamin D deficiency is a symptom of inflammation in the body

It's hard to keep up with advances in scientific knowledge -- this paper seems to hypothesize that Vitamin D deficiency is a symptom of inflammation in the body rather than the cause of any issue and recommends not supplementing with Vitamin D! Go figure -- this after all the recent popularity of testing for Vitamin D deficiency and prescribing Vitamin D supplementation.