Which of the following is a benefit of dietary fiber?

Dietary fiber offers multiple health benefits, and one of its most important roles is aiding in digestion and helping to reduce cholesterol levels. Fiber, particularly soluble fiber, helps to regulate the digestive process by adding bulk to the stool and facilitating regular bowel movements. This can prevent constipation and promote overall gut health.

In addition to its digestive benefits, soluble fiber binds to cholesterol particles in the digestive system, which helps to lower the overall cholesterol levels in the blood. This can reduce the risk of heart disease, making fiber an important component of a heart-healthy diet.

The other choices do not accurately reflect the functions of dietary fiber. For instance, muscle mass is typically influenced by protein intake rather than fiber. Additionally, fiber does not increase sugar absorption; in fact, it can slow down the absorption of sugar, which helps to maintain stable blood glucose levels. Lastly, while certain nutrients are important for vision health, dietary fiber does not play a direct role in improving vision.