Circulating 25-Hydroxyvitamin D Concentrations in Overweight and Obese Adults Are Explained by Sun Exposure, Skin Reflectance, and Body Composition.

There was a highly significant ( P < 0.0001) relationship between sun exposure and the sun exposure index (SEI), (body surface area exposed × time outside) and between sun exposure and serum 25(OH)D ( P = 0.040) ( Table 2 ).

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As the noncalcitropic properties of vitamin D have been suggested to influence inflammation,hypertension, insulin resistance, and dyslipidemia ( 8 ), the clinical burden of lower serum 25(OH)D concentrations in overweight and obese individuals may be significant.

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