Myths vs facts: Pharmakogenetik Medicheck and weight loss

Pharmacogenetics (PGx) examines how genetic variants affect drug metabolism and response. A PGx test like Medicheck can provide insights into how certain medications are processed, mainly via CYP enzymes. For weight loss, the evidence is limited. While some studies suggest genetic influences on the efficacy of weight-loss drugs (e.g., orlistat, bupropion), they are not robust enough to guide personalized therapy. Most weight loss is driven by lifestyle factors (caloric balance, physical activity). A PGx test alone cannot prescribe a specific diet or exercise plan. Many companies market such tests as 'genetic diet advice,' which lacks scientific support. Fact: PGx can aid in selecting medications if pharmacotherapy for obesity is considered. Myth: A DNA test replaces blood work or nutritional counseling. Effect sizes of common weight-related genes are small (BMI change <0.5 kg/m² per allele). Thus, PGx is a complementary tool, not a magic bullet. Without medical supervision and lab values (e.g., liver function, kidney function), no medication should be started based solely on a genetic test.