What is one of the key functions of fiber in digestion?

Fiber plays a crucial role in maintaining gut health, which is one of its key functions in digestion. It contributes to digestive efficiency by adding bulk to the stool, which helps to regulate bowel movements and prevent constipation. Additionally, fiber is essential for fostering a healthy gut microbiome, as it serves as a food source for beneficial gut bacteria. These bacteria ferment fiber, producing short-chain fatty acids that have various health benefits, including reducing inflammation and enhancing the gut barrier function.

Through these mechanisms, dietary fiber helps maintain an optimal environment within the digestive tract. This environment is vital for overall digestive health, as it supports regularity and aids in the prevention of various gastrointestinal disorders. While fiber does influence nutrient absorption and can play a role in water retention, its most significant impact in this context is its ability to maintain gut health.