Since the human body lacks the enzyme to digest plant cellulose, it is difficult to digest plant fiber, but increasing the intake of cellulose is beneficial to the human body in many ways. Plant fiber exists in the cell walls of plants and is a non-water-soluble fiber, commonly found in cellulose, hemicellulose, lignin, etc. Although plant fiber is not digested or absorbed, it is important for human health. Although plant fiber is not digested and absorbed, it is important for human health. For example, it is conducive to E. coli synthesis of a variety of cellulose, so that people have a sense of satiety, not easy to feel hungry, is conducive to weight loss, stimulate the gastrointestinal tract, promote gastrointestinal peristalsis, is conducive to laxative, delay gastric emptying, so that the absorption of sugar to slow down, reduce the stimulation of the pancreatic islet cells, and is conducive to the metabolism of sugar. In short, appropriate consumption of fiber is beneficial to the human body.