Association between Genetically-Determined Body Mass Index and 25-Hydroxyvitamin D Levels After excluding participants receiving vitamin D supplementation for a specific reason, the GRS for BMI was positively associated with BMI levels at baseline: Spearman rank correlation and 95% CI = 0.071 (0.044; 0.098), p < 0.001; while the negative correlation with 25-hydroxyvitamin D levels did not reach statistical significance: −0.006 (−0.033; 0.021), p = 0.673.
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Vitamin D and Weight Change: A Mendelian Randomization, Prospective Study.
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