If you are interested in Vit D and the changing thinking about how much one needs, how it is best measured and tested for, what it affects and how you should get it (diet, supplements, sunshine), a doc that I work with just did an hour long lecture on it. The talk is directed at other docs, but he's a relatively plain spoken kind of guy, so he doesn't launch into incomprehensible med speak unless entirely necessary and even gives the listeners a warning when he's about to do it.
You can find his talk streaming here http://www.seattlechildrens.org/heal....aspx?id=73843
One of the more interesting things I learned is that sun dried mushrooms (especially shitake) are an incredible source of D - they produce D in the sun much like your skin does! You can even expose already dried shrooms to the sun and create more D that is stored. Sardines are good too, but shitakes are much more tasty.



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