Evidence check: FTO in the context of Schlaf

The FTO gene (fat mass and obesity associated) is primarily known for its strong link to obesity and BMI. In the context of sleep, the evidence is much weaker and inconsistent. Some GWAS have reported associations between FTO variants and sleep duration or quality, but these effects are typically small and often mediated by BMI – meaning sleep issues may be a consequence of higher body weight rather than a direct genetic effect. Other studies find no significant association after adjusting for BMI. MyBody-X DNA tests are not medical diagnostic devices; they provide informational genetic predispositions, not clinical sleep diagnoses. The predictive power of single SNPs is limited, ancestry-dependent, and should not be used as the sole basis for sleep optimization. For sleep disorders, a medical evaluation (e.g., sleep study) is recommended. Overall: FTO is not a strong sleep gene; focus should be on lifestyle factors like light exposure, sleep hygiene, and weight management.