Dietary fiber really helps to lose weight. On the one hand, dietary fiber itself will not be digested by the stomach, so it does not provide energy for the human body, thus reducing energy intake. On the other hand, dietary fiber can absorb a lot of water and expand rapidly in the stomach, so it will continue to feel full and reduce people's desire and demand for food intake. It does not provide energy by itself, but it also helps to reduce food intake. At the same time, dietary fiber can also promote defecation and discharge undigested waste in the intestine. Naturally, it will help weight control. There is also a mixture of dietary fiber and chyme, which can reduce and slow down the absorption of sugar in food by the small intestine; Dietary fiber can adsorb bile acids, reduce the absorption of blood lipids and cholesterol, and is beneficial to the reduction of blood lipids; Even part of water-soluble dietary fiber can be fermented by intestinal beneficial bacteria, which promotes the increase of intestinal beneficial bacteria and maintains the balance of intestinal flora. People with healthy intestines are less likely to be obese. Galactomannan (PHGG) is a kind of water-soluble dietary fiber with these functions.