Dietary fiber is a large group of sugars that are not easily digested and absorbed by the body. Dietary fiber is also known as the seventh category of nutrients, that is, in addition to the six nutrients often said to be the seventh category of nutrients, because it has very important physiological functions: 1, intestinal health role, that is, dietary fiber in the body can promote intestinal peristalsis, so that food can quickly pass through the intestine to promote defecation; 2, dietary fiber in the body fermentation, can promote the growth of probiotics in the intestine, but also to maintain the normal function of the intestinal barrier 3, dietary fiber can regulate body weight by increasing satiety; 4, blood sugar regulation, dietary fiber in the body can delay the absorption of carbohydrates, play a role in regulating postprandial blood sugar; 5, dietary fiber can regulate lipid metabolism, that is, the metabolism of fatty substances; 6, can prevent intestinal, such as the occurrence of colorectal cancer; 7, has an impact on the absorption of minerals, some soluble fiber can promote The absorption of calcium and iron minerals, but there are some insoluble dietary fiber, will affect the absorption of calcium and iron minerals.