The usefulness of microbiome testing for sports performance is currently not well established. While emerging research suggests that the gut microbiome can influence energy metabolism, inflammation, and recovery in athletes, the evidence is still preliminary. For example, some studies have found that elite athletes harbor specific bacteria like *Veillonella* that may help clear lactate, but these findings come from small observational cohorts and have not been replicated in large, controlled trials. Most commercial microbiome tests lack sport-specific validation and rely on general population norms. Therefore, they cannot yet provide actionable, personalized recommendations for training or nutrition. A microbiome test might offer exploratory insights into gut health, but it should not replace established blood markers such as iron, vitamin D, or creatine kinase. The evidence level is 'mixed' or 'unclear' due to the gap between mechanistic plausibility and clinical utility. Caution is advised: interpreting results without professional guidance could lead to unnecessary dietary changes or supplement use. For now, athletes are better served by evidence-based strategies like balanced nutrition, adequate hydration, and regular monitoring of key biomarkers.
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