What are the effects of fiber on the digestive system?

The correct choice highlights the role of fiber in promoting regular bowel movements and preventing constipation. Fiber is classified into two types: soluble and insoluble. Insoluble fiber adds bulk to the stool and helps it move through the intestines more efficiently, which is essential for maintaining regular bowel movements. It also helps prevent constipation by absorbing water, making the stool softer and easier to pass. This function is crucial for digestive health, as it supports the proper functioning of the intestines and can help reduce the risk of conditions like diverticulitis and hemorrhoids.

In contrast, while fiber does play a role in digestion, its primary impact is not on nutrient absorption in the way some other nutrients do. It can influence the absorption of certain substances but does not promote digestion in the same direct way that enzymes or other digestive aids might. Similarly, fiber does not increase gastric acid production or reduce bile production; those processes are controlled by different mechanisms in the body. Understanding the specific benefits of fiber enhances the overall comprehension of how it contributes to digestive health.