Can you tell us more about the role of vitamin D in the body, its optimal levels in the body, and the relationship of those levels to dietary intake?

Since vitamin D was first recommended as an essential nutrient for the U.S. public in 1943, recommendation levels for this nutrient have varied. Originally, recommended intake for vitamin D by the National Academy of Sciences was approximately 200 ...

from The World's Healthiest Foods http://ift.tt/1qhNGwV