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The third way vitamin D is different from other vitamins is the dramatic difference between natural vitamin D nutrition and the modern one. Today, most humans only make about a thousand units of vitamin D a day from sun exposure; many people, such as the elderly or African Americans, make much less than that. How much did humans normally make? A single, twenty-minute, full body exposure to summer sun will trigger the delivery of 20,000 units of vitamin D into the circulation of most people within 48 hours. Twenty thousand units, that's the single most important fact about vitamin D. Compare that to the 100 units you get from a glass of milk, or the several hundred daily units the U.S. government recommend as �Adequate Intake.� It's what we call an �order of magnitude� difference.

So, in winter we should all have sky lights in our homes and walk around nude. Seriously, this is great news but comes as no surprise to me. My grandmother told me forty + years ago that the sun was good for me. She based it on watching the animals and how good sun bathing fells.

No wonder those tanning salons are busy in the winter.

Dang - now I can't get the visual of your grandmother walking around nude out of my mind ... thanks a bunch <grin>.