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isomalt A bulk sweetener, about half as sweet as sucrose, consisting of a mixture of two disaccharides, glucose‐glucitol and glucose‐mannitol. It is about 50% metabolized, yielding 9 kJ (2.4 kcal)/gram. It is thought to be less laxative than sorbitol or mannitol, and does not encourage tooth decay, so is used in tooth‐friendly sweets.