Xylo-oligosaccharide is a kind of prebiological substance, which can' t be digested but can selectively activate bacterial reproduction within intestines. it can obviously improve intestinal micro ecological balance, proliferate bifid bacteria and gastric function. this point has been proved by experimental findings and recognized by more and more people.\r\ndirect physiological effect\r\n1. low in caloric value and difficult for digestion\r\n2. functioned as water-soluble edible fiber\r\n3. preventive to caries\r\n4. capable of improving blood sugar\r\n