Dietary Intake of Vitamin D

Since the primary source of vitamin D is synthesis in the skin, very little survey data are available regarding dietary vitamin D intake. As the widespread use of sunscreens and public health recommendations to avoid sun exposure limits this endogenous source of vitamin D, most people necessarily rely on vitamin D from either dietary or supplemental sources. Although dietary sources may provide an amount to meet the currently published 1997 recommendations for vitamin D, they fall short of meeting the suggested requirement proposed in recent studies [49, 53]. A supplemental source of vitamin D is likely required to meet these latter proposed recommendations, at least in the winter months when sun exposure is limited.

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