Just in this last year, there has been important new data reported about Vitamin D, the "sunshine" vitamin. First, so many human populations around the world have recently been found to be profoundly deficient in Vitamin D that an epidemic -- if not a pandemic -- of Vitamin D deficiency exists globally.

Here is one good recent summary report online:

http://www.naturalgrocery.com/common/news/news_results.asp?task=Features&id=9152&storeID=HEU5FKA...

A good overall discussion of Vitamin D is in the following link on Wikipedia. The included graphic aids are especially helpful.

http://en.wikipedia.org/wiki/Vitamin_D