Vitamin D (V1)

I'm going to start with Vitamin D today, and I think probably most of you know that vitamin D is called the "sunshine vitamin". And it's called that because there is absolutely no dietary need for vitamin D if you get adequate sunshine. And I think the real important words there is "if" because it turns out that in certain climates which aren't near the equator, there's a big question as to whether or not you do get adequate sunshine. So vitamin D really isn't actually a vitamin. It's a pro-hormone. When human beings evolve, we evolved in tropical climates and ran around naked with plenty of skin exposure to sunlight and so there was no dietary need for vitamin D at all. As humans migrated away from equatorial regions, they actually created a need for vitamin D in food because the sunlight wasn't adequate, I mean certainly, particularly during the winter months, it wasn't adequate at all.