What does dietary fiber help with in the digestive system?

Dietary fiber plays a significant role in maintaining a healthy digestive system, and one of its primary benefits is its ability to prevent constipation. This occurs because fiber adds bulk to the stool and promotes regular bowel movements by facilitating the movement of waste through the intestines. Soluble fiber, found in foods like oats and legumes, absorbs water and forms a gel-like substance, which helps soften the stool. Insoluble fiber, present in whole grains and vegetables, adds bulk and aids in speeding up the passage of food through the digestive tract.

While other aspects of diet might influence blood sugar levels and protein absorption, dietary fiber's direct and well-documented function is in enhancing digestive health and preventing conditions such as constipation by encouraging a smooth passage of food and waste. The enhancement of flavor in foods is not a primary role of dietary fiber; rather, fiber contributes to the overall nutritional quality of foods.