Nutritious concentrated fruit juice contains a lot of dietary fiber. Fruit cellulose is the main component of plant cell wall, it is not a kind of nutrient, but after human body ingestion, it absorbs water and expands, absorbs harmful ingredients in food, stimulates gastrointestinal peristalsis, helps digestion, speeds up excretion in the body, shortens the retention time of harmful substances in the body, and finally achieves the goal of preventing gastrointestinal diseases, which has positive significance for the prevention of digestive tract cancer. Cellulose is also called by nutritionists as the seventh nutrient after protein, carbohydrate, fat, inorganic salt, vitamin and trace element.