Stabilizers and thickeners: gums, starches, and pectin

Xanthan gum, guar gum, carrageenan, pectin, modified starch — this is a set of words that looks alarming on an ingredient label but means something quite boring: the product needs to have the right consistency and not separate before its expiration date. Most of these substances are plant-based polysaccharides, and they behave like fiber during digestion.

What they do

Thickeners increase viscosity: they bind water and prevent liquids from spreading. Stabilizers maintain structure: they prevent separation, settling, and precipitation. Often, these are the same substances serving different roles.

The tasks they perform include:

• preventing yogurt from separating into whey and solids during storage;
• preventing ice cream from turning into ice with large crystals;
• keeping sauces thick so they do not run off a spoon;
• preventing sediment in plant-based beverages;
• helping jam set without long boiling times.

A related function is water retention in a product, and here thickeners are sometimes used to reduce costs: there is more water in the product, but the consistency is maintained.

Main groups

Almost the entire table consists of plant-based raw materials or products of microbial fermentation. Xanthan gum is obtained by fermenting sugar with bacteria, which is the same method used for monosodium glutamate.

About modified starch

The word "modified" here has nothing to do with GMOs, and this is the most common confusion on the topic. It refers to the physical or chemical processing of regular starch so that it does not break down during heating, freezing, or in acidic environments.

A breakdown of this related misconception can be found in the article about myths about additives and GMOs.

What is known about tolerance

Most of these substances are not absorbed and reach the large intestine, where they are fermented by microflora—that is, they behave like soluble fiber, which is discussed in the article about fiber.

Hence the only common practical effect: in large quantities, they can cause bloating and loose stools. This is dose-dependent and usually occurs with heavy consumption of products high in thickeners, not from a single cup of yogurt.

Carrageenan is discussed separately: some animal studies describe inflammatory effects, but the applicability of these data to human dietary intake remains a subject of debate, and the assessments of expert bodies differ. The correct phrasing is "it is being discussed," not "it is proven."

Thickeners without a code

The same job is performed by common ingredients: gelatin, corn starch, flour, egg yolk, and powdered milk. On an ingredient label, they look like regular food, and this is the basis for the "no stabilizers" claim—a tactic analyzed in the article about how additives are hidden.

A separate case is powdered milk in yogurt: it thickens, adds protein, and is also a milk allergen, which is covered in the article about milk protein.

What to look for in practice

1. Do not be afraid of the word "gum." It is a plant-based polysaccharide, not a synthetic one.
2. Check the order of ingredients. Many thickeners listed near water at the beginning of the list are a sign of a diluted product.
3. Consider your gut sensitivity. If you react with bloating, these might be the cause, which can be verified through observation.
4. Check codes in a reference guide. The status of each is available in the E-additive reference guide.

Count it from a photo

Frequently asked questions

What is gum in a product's ingredients?

A plant-based polysaccharide that binds water and increases viscosity. Guar gum comes from guar seeds, locust bean gum from carob seeds, and xanthan gum is produced by the fermentation of sugar by bacteria.

Is modified starch a GMO?

No. "Modified" here refers to the physical or chemical processing of regular starch so that it does not break down during heating, freezing, or in an acidic environment. It has nothing to do with genetic modification.

Are thickeners harmful?

Most of them are not absorbed and behave like soluble fiber. The practical effect in large quantities is bloating and a laxative effect, which is dose-dependent. Carrageenan is discussed separately, but data on humans is controversial.

Why are stabilizers in yogurt?

To prevent the product from separating into whey and a solid part during storage and to maintain consistency. Dried milk sometimes plays the same role, which additionally adds protein.

Can a product be made without stabilizers?

Gelatin, starch, flour, egg yolk, and dried milk can perform the same job — they are considered common ingredients and do not have codes. The label "no stabilizers" often means exactly such a substitution.

Read next

• Emulsifiers: what they do in food and what is known about them — Water and fat do not mix—this is a basic fact, and it is the source of half the problems in food technology.
• Fiber: what it does in the gut and how much you need — We know that we "need more" fiber, but that is usually where the conversation ends: it is unclear what it physically does, why it causes bloating, and where the 25–30 grams per day recommendation comes from.
• How manufacturers hide additives in the ingredient list — A short ingredient list sells better than a long one, and manufacturers know it.

This article is for general information. It is not medical advice, a diagnosis, or a prescription for treatment or a diet, and it does not replace a consultation with your doctor. If you have a health condition, are pregnant, take medication, or follow a diet prescribed to you, decisions about food belong with your doctor.

Figures from regulations, guidelines and studies are given as they stood when this article was prepared and may since have changed; check them against the primary sources. This article is not advertising, an offer, or individual advice, and neither the author nor the site owner is responsible for decisions taken on the basis of it.