What to watch with Homocystein and Sport?

Homocysteine is a sulfur-containing amino acid derivative; elevated levels are associated with cardiovascular risk. In athletes, evidence suggests that prolonged, intense endurance exercise can transiently increase homocysteine – possibly due to increased oxidative stress and methionine turnover. Conversely, regular moderate exercise tends to lower homocysteine, likely via improved kidney function and beneficial effects on B-vitamin status. Important caveats: a single homocysteine test is unreliable due to diurnal and dietary fluctuations. Genetic variants (e.g., MTHFR) contribute only modestly; folate, B12, and B6 status are more decisive. Supplementing without deficiency can be harmful (e.g., B6 overdose causing neuropathy). The evidence for direct sport-specific recommendations from homocysteine levels is weak – it remains a mechanistic marker. If values are abnormal, consult a physician. Interpret DNA tests (like MTHFR) cautiously, as clinical significance is often overstated.