A high-fiber diet positively affects cholesterol levels by promoting the excretion of low-density lipoprotein (LDL) cholesterol, often referred to as "bad" cholesterol. Soluble fiber, found in foods like oats, beans, and fruits, binds to cholesterol in the digestive system and helps eliminate it from the body. This process contributes to a lower overall cholesterol level and supports heart health. Furthermore, a fiber-rich diet aids in weight management by promoting satiety, ensuring that individuals feel full longer, which can indirectly lead to reduced cholesterol levels.