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Recognition of what has been called a “hidden epidemic” of vitamin D deficiency has motivated numerous investigations into the possible consequences of deficient or suboptimal levels of vitamin D. Several randomized trials have been conducted to determine the optimal dose for prevention of osteoporosis and fractures, and numerous longitudinal studies have examined potential protective effects of vitamin D supplements against cancer or metabolic and cardiovascular diseases. Surprisingly, little research has been done on the effects of vitamin D on cognitive function or dementia.
Three new studies are a welcome, albeit small, step toward filling this gap. Two of these studies are cross-sectional: Buell and colleagues studied 318 low-income eld…