Foods with high dietary fiber include konjac flour, matsutake mushrooms, black fungus and shiitake mushrooms. From the nutritional composition of food to analyze, on average, every 100 grams of konjac fine powder contains about 74 grams of dietary fiber, every 100 grams of dried matsutake mushrooms contain about 48 grams of dietary fiber, every 100 grams of dried black fungus contains about 30 grams of dietary fiber, every 100 grams of dried shiitake mushrooms contain 32 grams of dietary fiber. Dietary fiber is a special kind of substance, its biggest characteristic is that it cannot be digested and absorbed by the intestine, but it can be fermented in the intestine, so it can provide the required nutrients for the intestinal flora. Lignin, pectin, cellulose, hemicellulose and other non-starch polysaccharide substances in food belong to dietary fiber. The normal functioning and metabolism of the body requires not only dietary fiber, but also adequate protein and carbohydrates and other nutrients, and it is recommended to maintain a nutritionally balanced diet in daily life.