Chicory is a Good Source of Inulin. Inulin or inulin fiber, as it is also known, is a carbohydrate. It is made up of a small number of linked sugar molecules and is therefore classed as an oligosaccharide. This term is derived from the Greek words oligos, meaning few and sacchar, which means sugar.This oligo-saccaride is largley undigested by the human digestive tract and inulin is thus also considered to be a fiber.igh levels of inulin are typically found in the storage organs of plants, the roots. Those plant roots, which we eat as vegetables, can therefore be particularly good sources of inulin. These include: 1  Chicory root.