There is growing awareness and evidence that vitamin D plays a pivotal role in maintaining health beyond its major biological function of enhancing calcium absorption and improving bone mineral density. Research findings suggest a strong relationship among a number of chronic diseases and vitamin D deficiency. Although vitamin D deficiency can occur across the age continuum, older adults with chronic diseases are particularly at risk. This article focuses on the role of vitamin D in maintaining health, current evidence linking vitamin D deficiency with chronic illness, and the importance of vitamin D supplementation.
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