Evidence check: Fitness | LifestyleCheck in the context of Sport

The question of how much DNA tests can tell about fitness and sport performance is valid. MyBody-X tests (e.g., Fitness VITALITY) analyze variants in genes like PPARA (fat oxidation), FTO (weight management), APOE (heart health), and LCT (lactose tolerance). These can offer weak hints about metabolism and recovery, but they do not directly predict sprint/endurance ability or injury risk. The ACTN3 gene, often linked to sprinting, is not included. Evidence is mixed: some markers have human observational/GWAS support, but many claims are marketing-driven. Effect sizes are small, and training decisions should not rely solely on DNA results. The test may inspire lifestyle tweaks but cannot replace professional coaching or medical advice. For youth athletes or injury prevention, clinical assessments and training logs are far more relevant. In summary, current direct-to-consumer genetic tests for sport are not robust enough for personalized performance prediction.