I have been writing articles for a site called Vitamin D Explained, a place to learn about and discuss vitamin D research and opinion. I have been overwhelmed at the number of different diseases and conditions to which vitamin D levels seem to correlate in some fashion. It seems that correlations are relatively easy to establish compared to figuring out if there is a causal relationship as well and in what direction that causation runs. This study was a joy to read because it really takes the investigation of what vitamin D causes to a new and interesting level.
Competing interests declared:
I am paid to write articles for Vitamin D Explained. At present it is a non-commercial site serving as a forum to learn about and discuss vitamin D research and opinion at http://www.dexplained.com