Xylitol is a natural sugar alcohol that is found in plants, fruits, and vegetables. It tastes similarly to sugar, except that it doesn't cause tooth decay and provides lower calories. You'll find xylitol in many "sugar-free" candies. It also reduces the risk of cavities. Xylitol contains zero fructose and has negligible effects on blood sugar and insulin. For people with diabetes, prediabetes, obesity or other metabolic problems, xylitol is an excellent alternative to sugar.