Is FTO useful for Fruchtbarkeit?

The question of whether the FTO gene is useful for fertility cannot be answered with strong evidence. FTO is one of the most well-studied genes for body weight and obesity – variants like rs9939609 are associated with higher BMI. Obesity can impair fertility, for example through hormonal imbalances in PCOS or reduced sperm quality. However, the direct effect of FTO variants on fertility is small and overshadowed by lifestyle, environment, and many other genes. Consumer DNA tests like MyBody-X only report common SNPs, not clinical diagnoses. The evidence for a standalone role of FTO in fertility is best classified as 'gwas' – observational, with small effect sizes and no causal confirmation. Anyone with actual fertility concerns should seek medical evaluation rather than focus on a single gene.