Dietary fiber refers to an inherent and complete plant-derived food component that cannot be decomposed by human digestive enzymes; the chemical composition of dietary fiber is a variety of non-starch polysaccharides and lignin (an aromatic polymer) plant material, which mainly exists In plant cell walls, a small amount exists in the intercellular substance; including cellulose, hemicellulose (such as arabinoxylan), pectin, gum, chitin (fungi), resistant starch, resistant dextrin, Inulin, β-glucan, oligosaccharide, as well as lignin and vegetable wax (palm) that are not polysaccharides.