Dietary fibers are structural components of plants.
The type and amount of fiber in plants vary from species to species. A common misconception about fiber is that it is not digested by enzymes in the body and therefore provides no calories or nutrients. We eat quite a complex mixture of fibers. The first three are insoluble fibers which can absorb and hold water in the digestive system. The others are soluble fibers, which are partially broken down in digestion to a gel-like substance, which also retains water.