This book provides a structured overview of sports nutrition principles and how dietary choices influence athletic performance, endurance, strength development, and recovery. It explains key concepts such as macronutrient balance, glycogen storage, glycemic index, hydration strategies, electrolyte replenishment, and nutrient timing, clarifying how the body uses fuel before, during, and after physical activity. The content also examines pre-competition meals, post-workout recovery nutrition, muscle-building support, and the role of supplements within a broader framework of performance-focused eating. The book is intended for athletes, active individuals, coaches, and fitness enthusiasts who want a clearer understanding of how nutrition supports training outcomes without relying on extreme or restrictive approaches. It adopts an explanatory and practical approach, combining foundational sports science concepts with structured meal planning guidance, real-world examples, and recovery strategies to present sports nutrition as a consistent, evidence-informed component of long-term athletic development.