The role of fiber in maintaining healthy cholesterol levels is crucial as it helps to reduce LDL cholesterol and increase HDL cholesterol. Soluble fiber, found in foods like oats, beans, and fruits, binds to cholesterol particles in the digestive system and helps to eliminate them from the body. This mechanism can lower the overall cholesterol levels, thus reducing the risk of heart disease. A high-fiber diet not only supports cardiovascular health but also promotes satiety and regular digestion.