... staying inside a great deal are not exposed to sunlight, and even if they were, their skin's ability to synthesize Vitamin D from the sun has decreased. Thus, it's not uncommon to find older bodies lacking this essential vitamin that helps bones ...
http://www.pennlive.com/living/index.ssf/2013/11/food_and_aging_bodies_making_t.html
http://www.pennlive.com/living/index.ssf/2013/11/food_and_aging_bodies_making_t.html
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