zpo2, that's an interesting webpage that I haven't seen before. For those not interested in clicking on the link, it basically discusses the link between Vitamin D (a deficiency of it, actually) and infectious disease or general health, too.

Believe me, I have been interested in this recent surge in Vitamin D research, but I think the jury is still out. We are truly still scratching the surface of a whole world of processes that vitamin D is involved with. Vitamin D (which really shouldn't be called a vitamin, like the way Pluto isn't really a planet anymore) acts like a powerful hormone and turns on and off the expression of hundreds of genes and modifies the expression of thousands.

There is a lot of interest in Vitamin D among scientists and it is exciting stuff, but I think it's very important to also listen to alternative opinions when so little is still known. The prevailing paradigm that has recently emerged is that we humans have been vitamin D deficient in the developed world and that this lack of vitamin D is causing various diseases of modern living.I have provided the link to one essay below which cautions us not to wholeheartedly jump on that paradigm just yet.

It is a scientific article and a difficult read, but an important one IMHO since you don't see many alternative opinions to the prevailing paradigm. The link is to a pre-print version but it appears to be the same as the actual published article that I have read. You don't even have to go to a university library to read it!

Marshall TG: Vitamin D Discovery outpaces FDA decision making.
BioEssays Volume 30, Issue 2, Pages 173-182, February 2008
http://trevormarshall.com/BioEssays-Feb08-Marshall-Preprint.pdf

There very well may be a link between vitamin D and pandemics. I'm not totally pooh-poohing that idea. I'm just saying that we still need to keep an open mind about vitamin D and its role in health since we know so little and it is such a complicated web of biological processes that it is involved with.