Hello, corn, millet, barley, wheat bran (rice bran) and wheat flour (the material of black bread) are rich in fiber; Carrots, green beans, peas and potatoes in vegetables are also high-energy foods of cellulose. It is also for this reason that sweet potato is called the champion dish of anticancer food. Therefore, eating more potatoes, fish and bean products, especially cereals, such as wheat and bran flour, is beneficial to prevent colon cancer. These foods are high in cellulose.