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Fiber is also known as roughage. It is the indigestible part of plant foods that pushes through our digestive system, absorbing water along the way and easing bowel movements. The word fiber (North American) can also be spelled fibre (British).he word fiber is misleading, because many types of dietary fibers are not fibers at all. There are two broad types of fiber, soluble and insoluble. 1  Soluble fiber dissolves in water. 2  It changes as it goes through the digestive tract, where it is fermented by bacteria. 3  As it absorbs water it becomes gelatinous.
Dietary fiber or roughage is the indigestible portion of food derived from plants. It has two main components: 1  Soluble fiber, which dissolves in water, is readily fermented in the colon into gases and physiologically active byproducts, and can be prebiotic and viscous.riginally, fiber was defined to be the components of plants that resist human digestive enzymes, a definition that includes lignin and polysaccharides. The definition was later changed to also include resistant starch, along with inulin and other oligosaccharides.