Carbohydrates significantly affect energy levels during workouts. They serve as the body's primary fuel source, especially for high-intensity and endurance exercises. Consuming adequate carbohydrates can enhance glycogen stores within muscle cells, ensuring sustained energy output during physical activity. Without sufficient carbohydrates, individuals may experience fatigue, decreased performance, and difficulty completing workouts. Additionally, timing carbohydrate intake around exercise sessions can optimize energy levels and improve recovery. Ultimately, a balanced intake of carbohydrates is essential for achieving optimal performance and enhancing overall fitness outcomes.