Sorbitol is the alcohol form of sucrose. It occurs naturally in fruits and vegetables, and is manufactured from corn syrup.
Mannitol is the alcohol form of mannose. It occurs naturally in pineapples, olives, asparagus, sweet potatoes, and carrots. Mannitol is extracted from seaweed for use in food manufacturing. It is sometimes used as a sweetener in dietetic products.
Xylitol, also called “wood sugar,” is the alcohol form of xylose. It occurs naturally in straw, corncobs, fruit, vegetables, cereals, mushrooms, and some seaweeds. For use in food manufacturing, xylitol is extracted from birch wood chips. Xylitol is used as a sweetener in chewing gums and other dietetic products.