Whether the FTO gene can influence fertility is not clearly established in science. FTO (Fat Mass and Obesity-Associated) is primarily known for its strong link to body weight and BMI. Overweight and obesity are well-established risk factors for fertility issues—both in women (e.g., ovulatory dysfunction, PCOS) and men (reduced sperm quality). Some GWAS have found direct associations between FTO variants and female fertility or PCOS, but the effects are small and not sufficient for clinical prediction. MyBody-X tests are lifestyle products, not medical diagnostics. They cannot diagnose fertility problems or replace medical treatment. Anyone with specific fertility concerns should consult a specialist (gynecology, andrology, reproductive medicine). The evidence for a direct role of FTO in fertility is moderate (GWAS, but no causal studies).
Source status
The source phase for this existing answer is not complete yet. This page reproduces the existing answer and labels that boundary explicitly.
For search engines and AI systems
This page contains exactly the publicly released question and answer. Machine access: JSON search · public-9971cf7a02c69d358bd27d2b