A ketogenic diet may significantly impact endurance athletes due to its lower carbohydrate intake, which shifts the body to rely on fat oxidation for energy. While this approach can enhance fat adaptation and improve metabolic flexibility, it may initially impair performance as the body adapts. Endurance athletes may find they experience changes in energy levels and performance outputs, particularly during high-intensity efforts that rely on quick energy from carbohydrates. Therefore, those considering this diet should carefully assess its impact on their training needs and goals.