[devaboone]

I really like the Cochrane reviews, and love that they periodically update areas when there is more recent research. And you are correct, their articles on Vitamin D have become less enthusiastic with time. This makes sense I think, since the initial publications on a topic will all be "positive" - they have to find something new to get published (creating a publication bias). And they do try to account for publication bias, but really the best way to fix it is to have more studies. With Vitamin D getting so much attention, you can get published whether you find a correlation or not, so you have a wider range of studies to look at. I wanted to give a summary of the Cochrane reviews and the largest human trials of Vitamin D in the next blog post.