A sugar found in the cell walls of many plants, which has five carbon atoms in each molecule. As it cannot be broken down in humans, it does not increase blood sugar levels, so is used in sugar-free foods for people with diabetes or a need to control their weight. C₅H₁₂O₅.

【化】木糖。人体不能分解，所以不会增加血糖浓度，糖尿病患或减肥者都可安全使用。化学式为 C₅H₁₂O₅。