Inulin is found in all plants of the family of sea stars and bells, where it is the main stock. Chicory and Jerusalem artichoke are the main sources of inulin. Since inulin is not split in the small intestine, the body can not use it. Thus, the intestine acts as a soluble fiber. Its calorie content is very low. At the same time, it is sweet, so it can be used as a sugar substitute.