Maltitol: dangers, laxative effect, and blood sugar
You've read it on the label of a protein bar or sugar-free jam, and the name makes you hesitate. Let's get straight to the point: maltitol is an authorized food ingredient, evaluated and considered safe. It is neither toxic nor carcinogenic. Its only real drawback is digestive, it is perfectly predictable, and it can be managed by knowing a few things.
What is maltitol?
Maltitol belongs to the family of polyols, also known as sugar alcohols. This family also includes xylitol, sorbitol, isomalt, and erythritol.
It is obtained by hydrogenation of maltose, a sugar derived from wheat or corn starch. This transformation modifies the molecule just enough so that the body no longer digests it quite like sugar. Its additive number is E965.
This explains its success in the food industry: it is the polyol whose behavior most closely resembles sugar. It has approximately 90% of the sweetening power of sugar, it adds volume and texture, it caramelizes, and it holds up in chocolate coatings. Sugar-free chocolate retains its crunch thanks to it: no intense sweetener can do that.
How many calories, and what effect on blood sugar?
Two figures are enough to understand everything.
2.4 kcal per gram. This is the regulatory value adopted in Europe for all polyols, compared to 4 kcal for sugar. A product with maltitol is therefore lightened, not zero-calorie — the nuance matters when reading a bar with twenty grams of polyols.
A glycemic index of around 35, compared to 65 for table sugar. The rise in blood sugar is significantly gentler, but it does exist. This is the major difference with erythritol, which has no effect on blood sugar.
And good news, which is officially recognized: polyols benefit from two authorized claims in Europe. Replacing sugar, they induce a lower rise in blood glucose after a meal and contribute to the maintenance of tooth mineralization. Maltitol is not fermentable by plaque bacteria: it does not cause cavities.
The laxative effect: why, and starting from what amount?
This is the real issue, and there's nothing mysterious about it.
Maltitol is only partially absorbed in the small intestine. The fraction that continues its journey to the colon is fermented by bacteria, which produces gas, and it draws water into the intestine through osmotic attraction. The result: bloating, rumbling, and beyond a certain amount, a laxative effect.
This is not intoxication or an attack on the intestine: it is a mechanical, reversible phenomenon that disappears as soon as the dose is reduced. European legislators have also foreseen this: any product containing more than 10% polyols must bear the statement "excessive consumption may produce laxative effects". This is information, not a warning of danger.
The threshold varies greatly from person to person. Many people tolerate the equivalent of a protein bar without feeling anything; others perceive it from half a bar. Three practical rules:
Start with a half portion the first time. Tolerance improves with habit, as the intestinal flora gradually adapts.
Do not combine several sources in the same day: two bars, a sugar-free chocolate, and jam amount to a lot of polyols in total.
Avoid consuming them on an empty stomach or just before a workout: this is when discomfort is most noticeable.
Is maltitol carcinogenic or dangerous for health?
No. Maltitol is one of the additives evaluated by European authorities, who have found no genotoxicity or carcinogenicity. It is authorized quantum satis, meaning without a quantified acceptable daily intake, which is only granted to ingredients whose safety is not in question — the only practical limit being each individual's digestive tolerance.
There is also no signal concerning the liver or kidneys. Polyols are naturally present in some fruits, and humans have always consumed them.
Maltitol and diabetes
Its lower glycemic index makes it an interesting sugar substitute, and that's precisely why it has been found in diet products for decades.
Two honest clarifications, however. Firstly, it counts in carbohydrates: on a European label, polyols are included in the "of which polyols" line under carbohydrates, and they are not neutral. Secondly, adjusting a diet in case of diabetes is the responsibility of a doctor or dietitian, never a label.
Maltitol or erythritol?
Both are polyols, but they behave differently, and it's useful to know when choosing a product.
Maltitol sweetens almost like sugar, adds volume and texture, but provides 2.4 kcal per gram, slightly raises blood sugar, and ferments in the colon.
Erythritol is absorbed and then eliminated unchanged in urine: almost zero calories, no effect on blood sugar, and much less fermentation. In return, it is less sweet, leaves a cool sensation in the mouth, and does not provide the same texture.
Neither is "better" in absolute terms: it depends on the product and your digestion.
Where can you find it in our department?
Maltitol is the reference sweetener for coated protein bars, because it is what allows for sugar-free chocolate coating: the PHD Smart Bar, the Grenade Carb Killa, and the Warrior Crunch are among them.
If you are sensitive to polyols, two options in our range: products sweetened with intense sweeteners rather than polyols, such as zero sauces and Rabeko jam, and uncoated snacks, which are often better tolerated. A protein powder prepared with water also remains the simplest way to get your protein without any polyols.
Frequently Asked Questions
Is maltitol dangerous?
No. It is an authorized and evaluated additive, with no genotoxicity or carcinogenicity noted, and authorized without a quantified daily dose. Its only limit is digestive tolerance, which varies from person to person.
Does maltitol make you gain weight?
It provides 2.4 kcal per gram, compared to 4 for sugar: for the same quantity, it's less. As always, it's the total daily intake that matters, not an isolated ingredient.
Is maltitol laxative?
Beyond a certain amount, yes. The unabsorbed fraction ferments in the colon and draws water. This is reversible and not serious: reducing the dose is sufficient. The legal mention on the packaging indicates this phenomenon.
What is the glycemic index of maltitol?
Around 35, compared to 65 for table sugar. Lower, but not zero: it counts towards the day's carbohydrates.
Is maltitol carcinogenic?
No. No data retained by European authorities supports this.
Maltitol and diabetes, is it compatible?
Its lower glycemic index makes it a commonly used sugar substitute in dietetics. It remains a carbohydrate, and adapting a diet in case of diabetes is the responsibility of a doctor or dietitian.
How to avoid bloating?
Start with a half portion, do not combine several polyol-containing products in the same day, and avoid taking them on an empty stomach or just before a workout. Tolerance improves with habit.
Does maltitol cause cavities?
No, and this is one of the two authorized claims for polyols: they contribute to the maintenance of tooth mineralization, whereas sugar attacks it.
Maltitol or erythritol, which to choose?
Erythritol is better tolerated and provides no calories or blood sugar elevation; maltitol sweetens better and provides texture. The choice depends on the product and your digestion.
Where can maltitol be found?
In coated protein bars, sugar-free chocolates, some confectionery, and lightened spreads. It is always indicated in the list of ingredients and counted in the "of which polyols" line.
Sugar-free products near Montpellier?
Our store is in Vendargues, about ten minutes from Montpellier. In this department, digestive tolerance is personal: the best way to find what suits you is to start with one or two references rather than a whole box, and we are here to guide you. We also ship throughout France and Europe.
Sources: EFSA for the evaluation of polyols and authorized claims, European regulation on consumer information for the energy value of polyols and the mention of laxative effects. This information does not replace medical advice. Dietetic products are part of a varied and balanced diet and a healthy lifestyle.
