The Dietary Fiber is an indigestible portion of food which is derived from the plants. It can be classified into two categories : Soluble (dissolves in water) and Insoluble (does not dissolve in water). Its primary function is to detoxify our digestive tracks and it ensures smooth functioning of our digestive system. The foods that are rich in dietary fibers are: Raspberries, Spaghetti, Bran flakes and Split peas.