Myths vs facts: FUT2 and Sport

Myths vs. facts: FUT2 and sport. The FUT2 gene determines secretor status, which influences gut microbiome composition and vitamin B12 absorption. A common myth is that non-secretors (about 20% of the population) are automatically at a disadvantage in sports. In reality, some studies suggest non-secretors may have slightly lower B12 levels, which could theoretically affect endurance performance, but the effects are small and findings are inconsistent. Another myth is that FUT2 status directly predicts athletic talent or success. The fact is that training, nutrition, and recovery are far more important. The evidence for a meaningful impact of FUT2 on sport performance is weak and largely mechanistic. Knowing your FUT2 status might help you monitor B12 levels more carefully, but it is not a performance guarantee. Individual variation is huge, and lifestyle factors dominate.