Inulin is a type of soluble fibre found in many plants. It is made up of chains of fructose molecules that are linked together in a way that cannot be digested by the small intestine. Therefore, it travels to the lower gut, where it functions as a prebiotic, or food source for the beneficial bacteria that live there. The gut bacteria convert inulin and other prebiotics into short-chain fatty acids, which provide various health benefits.