Complex carbohydrates are crucial for maintaining stable energy levels throughout the day. Unlike simple carbohydrates, complex carbs are digested more slowly, providing a steady release of glucose into the bloodstream. This helps to sustain energy for both daily activities and workouts, preventing sudden spikes and crashes in energy levels. Sources such as whole grains, legumes, and starchy vegetables are rich in fiber, which also aids in digestion and can enhance feelings of satiety. Thus, incorporating complex carbohydrates into the diet supports both physical performance and overall health.