Dietary fiber includes soluble cellulose and insoluble cellulose. Among them, soluble cellulose is pectin, gluten and seaweed polysaccharide, which exists in fruits, cereals, seaweed and other foods. They can be dissolved in water and made into gelatinous food. Insoluble cellulose accounts for about 10% of total dietary fiber.

~20%。 They are crude fiber and hemicellulose, which exist in corn, wheat bran, celery, leek, day lily, lentils and so on.

Dietary fiber can be decomposed by intestinal bacteria to form a small amount of monosaccharide, water, carbon dioxide, vitamins and inositol. Among them, vitamins, inositol and monosaccharides have strong water absorption, which can increase the volume of "feces", stimulate gastrointestinal peristalsis, and accelerate the running speed of feces in the intestine, thus shortening the contact time between toxic, carcinogenic and other harmful substances and the intestinal wall and reducing their absorption by the human body.

Dietary fiber combined with cholic acid can increase cholesterol excretion in feces. So as to prevent gallstones and improve blood lipid. According to the survey, many patients with mild gallstones and hyperlipidemia can reduce cholesterol in bile by eating 50 grams of wheat bran every day for one month. This shows that dietary fiber has a good effect on eliminating the symptoms of early gallstones and hyperlipidemia.

For diabetic patients, taking proper dietary fiber, such as eating a certain amount of miscellaneous grains, wheat bran, beans and vegetables, can significantly reduce the amount of sugar in urine, thus reducing the amount of insulin accordingly, which is conducive to preventing diabetes.

Although dietary fiber has many effects on human body, its intake should be moderate. Because dietary fiber contains phytic acid or oxalic acid, it can combine with calcium, magnesium, zinc and iron, which hinders the absorption and utilization of these elements by human body. For people with weak gastrointestinal digestive function, don't eat too much food containing crude fiber on the premise of maintaining normal daily stool, so as to avoid or reduce the loss of nutrients in the intestine. Patients with digestive tract diseases such as gastric ulcer should prevent gastrointestinal bleeding and intestinal perforation caused by excessive intake of crude fiber.

I hope the above contents are helpful to you.