This is waht i have found so far..
Sugar alcohol is neither a "sugar" nor an "alcohol". Sugar alcohols affect the blood glucose levels less than regular table sugar, which is why some diet plans allow a certain amount of them. In most people, they quickly add up to too many carbs (they contain a little more than 1/2 the carbs than an equal amount of table sugar.) Sugar alcohols available in the U.S. include Mannitol, Sorbitol, Xylitol, Maltitol, and Maltitol Syrup, as well as hydrogenated starch hydrolysates, are found naturally in berries, apples, plums and other foods.
They also are produced commercially from carbohydrates such as sucrose, glucose and starch. Then there are the unpleasant "side effects" of sugar alcohols. They can cause abdominal discomfort and bloating and they also have a laxative effect. Consumption of 30 to 50 grams of sorbitol or xylitol, or 20 grams of mannitol, causes diarrhea in most people.
less well-known sugar alcohols include: Galactitol, Erythritol, Inositol, Ribitol, Dithioerythritol, Dithiothreitol, and Glycerol.