What really is sugar alcohol?

If you've looked lately at the “Nutrition Facts” panel on a pack of sugar-free gum or candy, you might be surprised to see that it contains “sugar alcohol.” Don't let the name fool you. These ingredients were given this consumer-friendly name because part of their structure resembles sugar and part is similar to alcohol.

Not one in the same Don't be confused. Although they share a similar name, sugar alcohol and alcoholic beverages do not have the same chemical structure. Sugar alcohol does not contain ethanol, which is found in alcoholic beverages.

What is sugar alcohol?

Sugar alcohols, also know as polyols, are ingredients used as sweeteners and bulking agents. They occur naturally in foods and come from plant products such as fruits and berries. As a sugar substitute, they provide fewer calories (about a half to one-third less calories) than regular sugar. This is because they are converted to glucose more slowly, require little or no insulin to be metabolized and don't cause sudden increases in blood sugar. This makes them popular among individuals with diabetes; however, their use is becoming more common by just about everyone. You may be consuming them and not even know it.

Common sugar alcohols are mannitol, sorbitol, xylitol, lactitol, isomalt, maltitol and hydrogenated starch hydrolysates (HSH). Sugar alcohols are not commonly used in home food preparation, but are found in many processed foods. Food products labeled “sugar-free,” including hard candies, cookies, chewing gums, soft drinks and throat lozenges often consist of sugar alcohols. They are frequently used in toothpaste and mouthwash too.

So why are sugar alcohols used so often? For one thing, they help to provide the sweet flavor to food in many products marketed towards individuals with diabetes. But, beware! There is often the misconception that all sugar alcohol-containing products are “free foods.” Some of these products may still contain significant amounts of carbohydrates. It's important to check the food label for the total carbohydrate contained in the product and talk with a registered dietitian to determine how it will best fit into your meal plan.

If a manufacturer uses the term “sugar free” or “no added sugar,” they must list the grams of sugar alcohols. If more than one sugar alcohol is used in a product, the “Nutrition Facts” panel will list the amount of sugar alcohol it contains under the total carbohydrate. If just one sugar alcohol is used, the label will list its specific name, for example, “mannitol” or “hydrogenated starch hydrolysates.” Sugar alcohols vs. artificial sweeteners Sugar alcohols and artificial sweeteners, such as saccharin (Sweet & Low®) and aspartame (Equal® or Nutrasweet®), are not one and the same. One difference between the two types of sugar substitutes is that the artificial sweeteners contain zero calories whereas sugar alcohols contain about 2.6 calories per gram. Another issue is diabetes management. Artificial sweeteners do not contain carbohydrates so they do not cause blood sugar to elevate, whereas, sugar alcohols have some effect on blood sugar. Overall, both can be useful in diabetes management when used properly.

As a group, sugar alcohols are not as sweet as sucrose (table sugar), and they are also less caloric than sucrose. Their flavor is similar to that of sucrose, and they can be used to mask the unpleasant aftertastes of some high intensity sweeteners. In addition to their sweetness, some sugar alcohols can produce a noticeable cooling sensation in the mouth when highly concentrated, for instance in sugar-free hard candy ("boiled sweets") or chewing gum. Sugar alcohols are not metabolized by oral bacteria, and so they do not contribute to tooth decay. They do not brown and caramelize when heated.

Reference: Yale New Haven Hospital