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Hey Fit!

I know you have done a ton of posts on meal-replacement bars, but they sure still manage to confuse me! Today, I picked up a South Beach Meal Replacement bar while I was out running errands and wanted a quick pick me up (I know, should have gone to the fruit aisle instead!). When reading the package, it said "less than 1 gram of sugar" but then 17 grams of "sugar alcohol!" What the heck does that mean! Please tell me I didn't just stuff my face with something horrible! Thanks!

—Label Reading Renny

Check this: "sugar alcohol" is neither sugar nor alcohol. It is polyol, which is a hydrogenated carbohydrate. On a structural level (remember chemistry?), sugar alcohol resembles sugar, which after all is a carb. And part of a polyol resembles alcohol but will not get you drunk. This would be why they are referred to, in a misleading manner, as sugar alcohol. The most common types of sugar alcohol are maltitol, sorbitol, isomalt, and xylitol (used mostly in gum).

To see if sugar alcohol is naturally occurring just read more.

This suped-up sugar replacement that occurs naturally in many fruits and veggies is not completely absorbed or completely metabolized by the body. This translates ultimately to fewer calories consumed by the body. Sugar alcohol contains about .02 to three calories per gram, whereas a gram of sugar contains about four calories. No insulin is required to convert sugar alcohol into energy, making it relatively diabetic friendly, but definitely ask your doctor to find out if sugar alcohol is safe for you to eat.

However, there are some negative side effects to polyol sweeteners, and they mostly involve the lower-GI tract. The most common side effect to watch out for is bloating and diarrhea when sugar alcohol is eaten in excessive amounts. "Excessive amounts" varies from sugar alcohol to sugar alcohol, but for mannitol it is above 20 g. So just like sugar, you best eat these sweet substitutes in moderation.

I would say that eating a little bit of sugar alcohol every now and then isn't really going to do you harm. Since manufacturers must show the sugar alcohol count separately if a product is labeled “sugar free” or "no added sugar," you should be able to track how much you are ingesting. I do agree with you about sticking to the produce aisle at your grocery store as much as possible.

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