Is DNA Stoffwechseltest useful for longevity?

A DNA metabolism test can provide insights into genetic variants that influence energy expenditure, nutrient utilization, or fat oxidation (e.g., FTO, PPARG, UCP1). However, effect sizes are generally small – the FTO risk allele raises BMI by only 0.3–0.4 kg/m² per allele. Human studies show that exercise and protein intake can attenuate this effect by about 30 %. For longevity, lifestyle factors (diet, physical activity, sleep, stress management) are far more decisive than individual genes. The evidence for a direct benefit of metabolism tests on lifespan is moderate and mostly based on observational data. No randomized controlled trials have demonstrated that gene-based dietary plans extend life expectancy. These tests may serve as a motivational tool but should not be mistaken for a medical prognosis. Caution is warranted against exaggerated marketing claims: individual genetics is just one small piece in a complex longevity puzzle.