That gap between the front of the package and the back panel is where most bar shopping goes wrong. Here is the exact labeling, the nutrition numbers that actually matter, and the traps that catch people who read the big print.
How Do You Spot Hidden Sugar Alcohols On A Label?
The ingredient list decides, not the front-of-package claim. The FDA’s nutrition facts guidance names the polyols you are looking for: erythritol, hydrogenated starch hydrolysates (HSH), isomalt, lactitol, maltitol, mannitol, sorbitol, and xylitol.
Two label habits make this easier:
- Read every ingredient, not just the first few. Sweeteners sit near the end of the list, so they are easy to skim past.
- Check the Nutrition Facts panel under Total Carbohydrate for a “sugar alcohol” line. Manufacturers may list the grams voluntarily, but the FDA requires disclosure when the product makes a sugar, sugar alcohol, or related health claim while polyols are present.
A bar can swap sugar for polyols and still print “0 g sugar,” and the FDA lets amounts under 1 gram read as “less than 1 gram,” with anything under 0.5 gram rounded to zero.
What Nutrition Numbers Actually Matter?
Compare protein per labeled serving first, then calories, added sugar, saturated fat, and sodium.
But protein alone is a bad ranking system. A calorie-dense bar with a chocolate coating can carry the saturated fat and sodium of a candy bar, and the name “protein bar” does not establish nutritional adequacy. Judge it against how you plan to use it: a pre-workout snack and a meal replacement have very different targets.
Fiber deserves its own look. Some bars lean on concentrated fibers or resistant carbohydrates that trigger bloating and gas even when no sugar alcohol appears anywhere on the label — which matters most if gastrointestinal symptoms are why you are reading labels in the first place. Check the serving size and servings per package too, since a bar sold as one serving may be smaller than it looks.
| Label Check | What To Look For | Why It Matters |
|---|---|---|
| Ingredient list | Erythritol, maltitol, sorbitol, xylitol, isomalt, lactitol, mannitol, HSH | The only definitive sugar-alcohol test |
| Sugar alcohol line | Any grams listed under Total Carbohydrate | Required when a sugar-related claim is made |
| Protein | Grams per labeled serving | FDA Daily Value is 50 g for ages 4+ |
| Added sugar | Low or none | Dietary Guidelines say limit added sugars |
| Saturated fat | Compare across brands | Chocolate coatings and nut butters add it fast |
| Sodium | Compare across brands | Salted ingredients push this number up |
| Protein source | Whey, casein, soy, egg, pea, rice, collagen, nuts | Quality and allergen fit vary by source |
| Serving size | Grams per bar and bars per package | Prevents undercounting what you actually eat |
Which Ingredients And Claims Should You Double-Check?
Treat “keto,” “low-carb,” “sugar-free,” and “natural” as marketing, not evidence. None of those words promise a polyol-free bar, and “natural” says nothing about nutrition quality.
Sugar alcohols are incompletely absorbed carbohydrates. A Cleveland Clinic review notes that polyols can cause bloating, gas, abdominal discomfort, and diarrhea, especially in people who are not used to them, and that tolerance swings widely between individuals. Erythritol tends to cause fewer digestive issues than several other polyols, but it is still a sugar alcohol — so it fails a strict no-polyol requirement.
The mistakes that matter most:
- Checking only the front package instead of the full ingredient statement.
- Skipping maltitol, sorbitol, mannitol, xylitol, isomalt, lactitol, and HSH because the word “sugar” never appears.
- Assuming every flavor in a product line shares the same ingredients, or that a reformulated bar keeps the old recipe.
- Overlooking allergens — milk, soy, peanuts, tree nuts, wheat, and egg all appear in common protein bar bases.
- Treating collagen as interchangeable with a complete protein source for every goal.
- Eating several bars in a day without adding up fiber, sweeteners, calories, and protein.
If a bar repeatedly causes symptoms, stop eating it. Anyone managing diabetes, gastrointestinal disease, kidney disease, food allergies, or a prescribed diet should get individualized advice from a qualified clinician rather than working from label claims alone. When you are ready to compare specific products, this tested roundup of bars without sugar alcohols narrows the field using the same label checks.