25(OH)D Status: Effect of D Supplement
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Background: Excess adipose tissue may lead to sequestrating of vitamin D, making it less available for use in the body.
Objective: This study determined if overweight or obese individuals (BMI > 25 kg m) had insufficient (<30 ng mL) levels of 25-hydroxyvitamin D [25(OH)D] and, if so, would serum levels respond to exogenous supplementation.
Methods: Sixty-three women who were overweight/obese (BMI = 31.07 ± 5.00 kg m) were randomly assigned in a double-blind manner to receive 5,000 IU of vitamin D (D) ( = 31) or a placebo (PL) ( = 32) daily. Serum 25(OH)D concentrations were measured by finger-stick analyses at baseline and after 8 weeks of supplementation. Data were analyzed by using a 2 × 2 (group × time) repeated measure multivariate analysis of variance to determine group differences for pre-values and post-values < 0.05).
Results: On day one of the study, both D and PL groups had insufficient levels of vitamin D (mean ± SD) 24.03 ± 9.78 ng mL and 23.62 ± 9.77 ng mL, respectively. After 8 weeks of supplementation, the D group 25(OH)D level rose to a mean of 43.57 ± 10.87 ng mL ( < 0.001) versus the PL group whose 25(OH)D level remained statistically unchanged 24.31 ± 8.84 ng mL. Women who were overweight/obese had insufficient vitamin D levels prior to supplementation.
Conclusions: Following supplementation with 5,000 IU of vitamin D, all subjects' 25(OH)D levels rose to a sufficient level (≥30 ng mL). The findings of this study concur with the Institute of Medicine and Endocrine Society recommendations in that two to three times the daily requirement of vitamin D is required to improve serum vitamin D levels in individuals who are overweight or obese.
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