<P> Dietary fiber or roughage is the indigestible portion of food derived from plants . It has two main components: </P> <Ul> <Li> Soluble fiber, which dissolves in water, is readily fermented in the colon into gases and physiologically active byproducts, and can be prebiotic and viscous . This delays gastric emptying which, in humans, can result in an extended feeling of fullness . </Li> <Li> Insoluble fiber, which does not dissolve in water, is metabolically inert and provides bulking, or it can be fermented in the large intestine . Bulking fibers absorb water as they move through the digestive system, easing defecation . </Li> </Ul>

Food that are high in fiber are most likely derived from