Myths vs facts: MTHFR and Sport

Myths vs. facts: MTHFR and sport. A common myth claims that MTHFR variants (C677T, A1298C) directly affect athletic performance, recovery, or injury risk. The scientific reality is more sobering: MTHFR encodes an enzyme in folate and homocysteine metabolism. Reduced-activity variants can mildly elevate homocysteine, which is associated with cardiovascular risk, but a direct, robust effect on sport parameters (endurance, strength, recovery time) is not established. Most claims rely on small studies or extrapolations from general medicine. For athletes, the main takeaway is to ensure adequate folate, B12, and B6 intake to keep homocysteine low – but this is a general health recommendation, not a sport-specific gene target. Personalized supplementation based solely on MTHFR genotype is not evidence-based. Other factors like training load, nutrition, sleep, and total calorie balance have far greater impact. Bottom line: MTHFR is not a 'sport gene.' Evidence for direct performance effects is weak to conflicting. Athletes should focus on proven training and nutrition principles, not gene myths.