The primary function of dietary fiber in the digestive system is to promote healthy digestion and prevent constipation. Fiber adds bulk to the stool, facilitating smoother bowel movements and enhancing gut health. It also aids in regulating blood sugar levels by slowing the absorption of sugars, which can prevent spikes in glucose levels. Moreover, fiber supports the growth of beneficial gut bacteria, contributing to a balanced microbiome. Adequate fiber intake is critical for overall digestive health and can lower the risk of chronic diseases, including heart disease.