膳食纤维可分为纤维素、半纤维素、果胶、胶质和木质素五类,也可分为水溶性纤维素和非水溶性纤维素。膳食纤维存在于植物性食物中,膳食纤维高的食物主要有蔬菜、水果、豆类、坚果类和谷糠、麦麸等。由于纤维素不能被人体消化,因 Dietary fiber can be divided into cellulose, hemicellulose, pectin, gum and lignin five categories, can also be divided into water-soluble cellulose and water-insoluble cellulose. Dietary fiber is found in plant foods. The foods with high dietary fiber mainly include vegetables, fruits, beans, nuts and bran, wheat bran and the like. Because cellulose can not be digested by the human body