Fiber plays a crucial role in the digestive system by promoting regular bowel movements and preventing constipation. It adds bulk to the stool, which facilitates its passage through the intestines. Additionally, fiber serves as a food source for beneficial gut bacteria, contributing to a healthy microbiome. This can lead to improved nutrient absorption and enhanced immune function. There are two types of fiber: soluble, which helps lower cholesterol levels, and insoluble, which aids in digestion. A balanced intake of both is vital for overall digestive health.