Water Absorbing Fiber
Both types of fiber – soluble and insoluble – absorb water as they pass from the stomach to the small intestine, the large intestine and ultimately are eliminated from the body.
Insoluble fibers provide bulk and absorb water, which helps everything move more easily through your digestive system. There are some mechanical benefits also, to the physical stimulation of your intestinal villi and large intestine walls that fiber provides.
Increased bulk, softer stool and shorter transit time, involve fiber. When there's less bulk, the muscles of the large intestine must contract more forcefully to transfer and eventually expel the smaller stool generated by a diet low in fiber.
Prebiotics are soluble fibers, which also absorb water, but additionally work to help support large intestine walls. They can promote normal muscular contractions that help move waste through, and out of your system – while working to support your overall health and immune system capabilities.