Evidence check: VDR in the context of Abnehmen

The vitamin D receptor (VDR) is often marketed in nutrigenetics as a 'fat-burning gene.' The scientific reality is more sobering: VDR polymorphisms (e.g., FokI, BsmI, TaqI) have been studied in association with BMI, body fat percentage, and weight loss response to calorie-restricted diets. Effect sizes are small, results are inconsistent, and most studies lack adequate statistical power. Mechanistically, VDR is plausible (vitamin D influences adipocyte differentiation, insulin sensitivity, and inflammation), but evidence for clinically relevant, personalized weight loss based on VDR genotype is lacking. Direct-to-consumer DNA tests greatly overstate predictive value. A VDR test alone tells you nothing about your actual weight trajectory – diet, exercise, sleep, and calorie balance dominate. If you consider such a test, treat it as motivational inspiration, not diagnosis. Evidence level: human-moderate (some studies, but heterogeneous and without clear actionable recommendations).