What is Isomalt? Where is the sugar substitute found and why is it considered “sugar-free” even though it has calories?
When it comes to sweets, many people turn to a sugar-free alternative – it’s better for the teeth and supposedly calorie-free. Unfortunately, this is often not true: Isomalt, for example, is a common sugar substitute in sugar-free foods – and it is actually sugar-free, but by no means low in calories.
What is Isomalt?

Isomalt is a sugar substitute (more precisely: a sugar substitute) and has the E number E953. In nature, the sugar alternative occurs, for example, in sugar beets. Isomalt is odorless, white and crystalline. The sugar substitute is also available in liquid form.
Isomalt for the food industry is produced from normal beet sugar in two processing steps:
In the first step, isomaltulose is extracted from the beet sugar with the help of enzymes.
In the next step, isomalt is obtained by hydrolysis – the splitting of chemical compounds by water.
What foods contain isomalt?
Isomalt is used in the production of many sugar-free and low-sugar foods: candies, baked goods, mustard, sauces, jams and desserts. Since isomalt only slightly affects blood sugar and insulin levels, it is particularly suitable for diabetics and is contained in many diabetic foods. It is used in corn flakes for its technical properties to improve the crunch.
In addition, isomalt is used in pharmacy and in animal feed production. And in technical applications, Isomalt is used as a stabilizer (e.g. in the production of PVC), plasticizer, adhesive or binder.
Identification: How do I recognize isomalt?
The Food Information Regulation of 2014 regulates the labeling of isomalt: sweeteners and sugar alcohols – to which isomalt belongs – are summarized under the term “sweeteners”.
Foodstuffs containing sweeteners must be labeled “with sweetener(s)”. In addition, the sweetener must also be included in the list of ingredients. For isomalt, for example, this could look like this: “sweetener isomalt” or “sweetener E 953”.
Why is isomalt “sugar-free” and still has calories?
Isomalt has almost the same sweetening power as normal sugar and can be processed in a similar way. However, anyone who assumes that “sugar-free” foods – which contain isomalt – are also calorie-free is wrong. Although isomalt has only half as many calories as sugar, it is still two calories per gram. So if you’re watching your calorie intake, don’t be misled by the “sugar-free” description.
However, isomalt has a lower glycemic index (GI) than regular sugar. The GI indicates how a carbohydrate-containing food affects blood sugar levels. A score below 50 is considered low. An index of two to a maximum of nine was found for isomalt in various studies. This means that, in contrast to normal household sugar (GI = 68), isomalt is more suitable for diabetics and people who want to lose weight.
Isomalt: tooth-friendly sugar substitute
Compared to normal sugar, isomalt is also significantly better for the teeth: It forms very little acid because it is not metabolized by the microorganisms in the mouth due to its stability. Isomalt has only a very low potential to trigger caries and is considered to be tooth-friendly.
Alternatives to isomalt

Isomalt has clear advantages: it is tooth-friendly, has a low glycemic index and only half the calories of regular beet sugar. However, don’t let the term “sugar-free” fool you: Many sugar-free foods are not also calorie-free. And the sugar substitute has another disadvantage: in large quantities, isomalt can have a laxative effect.
A calorie-free sugar alternative is erythritol. It is made by fermenting grape sugar. Like isomalt, it has only a minor effect on blood sugar and insulin levels. However, this sugar alternative is truly zero-calorie.





