We're nearing the end of what's been a long winter for people in many parts of the United States. In the middle and northern regions of the U.S., where winter brings not only cold but limited sun, people aren't only deprived of warmth, they also may be deficient in an important nutrient: Vitamin D. The body actually produces its own Vitamin D, in response to exposure to sunlight. For this reason, Vitamin D isn't actually considered a vitamin at all, but rather is classified as a hormone. Besides sun exposure, people also receive Vitamin D through foods -- fatty fish and fish oils, egg yolks, as well as fortified foods like dairy and juice -- and also from supplements. Unfortunately, many...
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