The article explores the ketogenic (keto) diet and its relevance for endurance sports. It includes a personal success story, an overview of keto principles, and its benefits (enhanced fat utilization, stable energy, fewer GI issues, weight loss) and drawbacks (reduced high-intensity performance, tough adaptation phase, potential nutrient deficiencies, practical challenges). Tips for a balanced keto diet and a recommendation to consult a professional are provided, emphasizing a personalized and cautious approach.