Risks and limits of FTO Ernährung

The FTO variant rs9939609 (A allele) is the most studied genetic marker for obesity risk, but its effect is modest. Carriers of the risk allele have on average a slightly increased BMI (about 0.3–0.5 kg/m² per allele) and a roughly 20–30% higher risk of overweight. However, the effect is strongly dependent on lifestyle factors: regular physical activity and a balanced diet can largely offset the genetic disadvantage. The variant primarily influences satiety and preference for energy-dense foods, not basal metabolic rate. Importantly, a positive FTO finding in a consumer DNA test is not a diagnosis. Its predictive value is limited, as many risk allele carriers remain lean. Moreover, most studies are based on European populations; transferability to other ethnicities is uncertain. For nutrition, this means: no strict diet based solely on the gene, but focus on healthy habits. In children, restrictive diets are not indicated and may even be harmful. Personalized nutrition based on FTO currently lacks sufficient scientific evidence to give specific dietary recommendations.