Evidence check: MC4R in the context of Blutzucker

MC4R (melanocortin-4 receptor) is a key regulator of energy balance and appetite. Variants such as rs17782313 near MC4R have been associated with higher BMI and type 2 diabetes risk in GWAS. The link to blood sugar is indirect: increased appetite and obesity can lead to insulin resistance and elevated fasting glucose. Effect sizes of single SNPs are small, explaining only a few percent of variance. Direct, independent effects on glucose regulation are not established. Consumer DNA tests often list MC4R as a 'blood sugar gene,' which can be misleading. Evidence is based on population studies, not causal mechanisms. Lifestyle adjustments are beneficial for carriers but not MC4R-specific. Safety note: Do not make clinical decisions based solely on this marker. Fasting glucose and HbA1c should be monitored by a physician.