Essential nutritional guidelines for athletes include adequate intake of macronutrients—carbohydrates, proteins, and fats—to support training demands. Hydration is crucial, especially before, during, and after exercise. Athletes should focus on whole, nutrient-dense foods to fuel performance and recovery. Timing meals around workouts can optimize energy utilization and muscle repair. Additionally, micronutrient intake is vital for overall health, so a balanced and varied diet is encouraged to support training intensity and recovery.