Which of the following is a benefit of dietary fiber?

Dietary fiber is recognized for its numerous health benefits, one of the most significant being its ability to regulate blood cholesterol levels. Soluble fiber, in particular, plays a crucial role in this process. It binds to cholesterol in the digestive system, helping to reduce the absorption of LDL or "bad" cholesterol into the bloodstream. This mechanism can lead to lower overall cholesterol levels and a reduced risk of cardiovascular diseases.

Moreover, dietary fiber also contributes to improved overall digestive health by promoting regular bowel movements and supporting a healthy gut microbiome. These factors can collectively contribute to better heart health, making fiber an essential component of a balanced diet.

The other options do not accurately represent fiber's role in nutrition. Fiber does not increase fat absorption, enhance protein digestion, or boost vitamin D absorption, making the regulation of blood cholesterol levels the most relevant and correct benefit associated with dietary fiber.