膳食纤维:膳食纤维通常包括纤维素、半纤维素、木质素和果胶等。它虽不能被人体吸收利用,但它们进入人体后可刺激肠蠕动,加速粪便的排出,从而减少粪便中的致癌因子与肠壁的接触时间。此外,由于膳食纤维吸收膨胀增大了粪便体积,降低了致癌因子的浓度,从而也起 Dietary fiber: Dietary fiber usually includes cellulose, hemicellulose, lignin and pectin. Although it can not be absorbed by the body, they can stimulate the peristalsis after entering the human body and accelerate the excretion of the excrement, thereby reducing the contact time between the carcinogenic factor in the excrement and the intestinal wall. In addition, due to the absorption of dietary fiber increased fecal volume, reducing the concentration of carcinogenic factors, which also played