Vitamin D: Critically Important For Health – How Much is Enough?
By Nathan Wei
Our ancient ancestors probably didn’t require vitamin D in food because they got sufficient D through skin exposure to ultraviolet rays from the sun. However, with gradual migration from areas near the equator to more distant areas where sunlight exposure become more problematic, the adaptation that allowed people to live in more temperate climates was to develop lighter skin in order to absorb vitamin D more efficiently. An exception would be Eskimos who get vitamin D from their diet.
Unfortunately, this adaptation has had its shortcomings. …