What is the primary role of dietary fiber in digestion?

The primary role of dietary fiber in digestion is to promote bowel regularity. Dietary fiber is a type of carbohydrate that the body cannot digest, and it plays a crucial role in maintaining digestive health. It adds bulk to the stool, which helps to facilitate its passage through the intestines. This bulkiness helps prevent constipation by easing the elimination process, making bowel movements more regular and comfortable.

Additionally, fiber fosters a healthy gut by supporting the growth of beneficial intestinal bacteria, which can further aid in digestion and nutritional absorption. A diet rich in fiber is associated with various health benefits, including reduced risk of digestive disorders and improved overall gut health.

The other options related to calorie absorption, blood sugar levels, and protein digestion do not capture the primary function of dietary fiber in the gastrointestinal system. While fiber can have indirect effects on blood sugar by slowing carbohydrate absorption and can impact overall caloric intake by promoting satiety, its main and most direct role is to ensure that digestion occurs smoothly and regularly.