Maltodextrin is a white, nearly tasteless powder made from starch that food manufacturers use as a thickener, filler, and preservative in a wide range of processed foods. It contains 4 calories per gram (the same as sugar) but has a higher glycemic index than table sugar, meaning it raises blood sugar faster. You’ll find it in everything from salad dressings and protein bars to yogurt, frozen desserts, and powdered drink mixes.
How Maltodextrin Is Made
Maltodextrin starts as starch, most commonly from corn in the United States, though potato, rice, wheat, and tapioca starch are also used. The starch is broken down through a combination of heat, acid, and enzymes into shorter chains of glucose molecules, typically 3 to 19 glucose units long. The result is a water-soluble white powder that dissolves easily and doesn’t taste sweet.
The degree of breakdown is measured by something called dextrose equivalent, or DE. Maltodextrin always has a DE below 20, which keeps it in the “not sweet” category. Products with a higher DE are sweeter, more soluble, and more prone to browning during cooking. Products with a lower DE behave more like the original starch: thicker, stickier, and better at forming gels and preventing crystallization. Manufacturers choose different DE levels depending on what they need the ingredient to do in a specific product.
Why It’s in So Many Foods
Maltodextrin is remarkably versatile, which explains why it appears on so many ingredient labels. Its functions include:
- Thickening and bulking: Low-DE maltodextrin is typically added at 1 to 5% in liquid foods to create a fuller body and a coating mouthfeel.
- Fat replacement: In products like cookies, maltodextrin can substitute 25 to 35% of the fat while still producing a soft, spreadable texture. It forms gels that mimic the melt-in-mouth quality of fat.
- Preventing crystallization: In ice cream and frozen desserts, it helps control ice crystal size, keeping the texture smooth.
- Carrying flavors and nutrients: Because it dissolves easily and has a neutral taste, it serves as a carrier for spice blends, vitamins, minerals, and non-caloric sweeteners in powdered form.
- Reducing sweetness: When manufacturers want to cut the sweetness of a filling or beverage without losing body, maltodextrin adds volume without adding a sugary taste.
You’ll commonly encounter it in dairy products (yogurt, ice cream, milk powders, cheese), baked goods, salad dressings, cereals, snack foods, sports drinks, candy, and instant soups. It’s also a staple in meal replacement shakes, protein powders, and energy gels.
How It Affects Blood Sugar
Despite not tasting sweet, maltodextrin spikes blood sugar quickly. Its glycemic index is higher than table sugar’s, placing it closer to pure glucose on the scale. Your body starts breaking it down the moment it enters your mouth: an enzyme in saliva called amylase chops the glucose chains into smaller pieces, and by the time maltodextrin reaches your small intestine, it’s rapidly absorbed as glucose.
This fast absorption also triggers an early insulin response. Research on healthy adults showed that just holding a maltodextrin-containing substance in the mouth (without swallowing) was enough to trigger the body’s “get ready” insulin release, called cephalic phase insulin release. When participants held a version without maltodextrin, no such response occurred. This means your body treats maltodextrin as a rapid sugar source from the very first moment of contact.
For most people eating typical amounts in processed food, this isn’t a dramatic event. But if you have diabetes or insulin resistance, maltodextrin’s high glycemic index is worth paying attention to. It can raise blood sugar just as fast as, or faster than, the sugars you’re already watching.
Concerns About Gut Health
A growing body of research has raised questions about what regular maltodextrin consumption does to the gut lining. Animal and cell studies have found that maltodextrin can trigger stress in the cells lining the intestine, which leads to thinning of the protective mucus layer that normally keeps bacteria separated from intestinal tissue. When that barrier weakens, low-grade inflammation can develop.
Maltodextrin has also been shown to help certain harmful bacteria form biofilms, essentially protective colonies that are harder for the immune system to clear. One type of E. coli associated with Crohn’s disease was found to form these biofilms more readily in the presence of maltodextrin. A separate study found that Splenda, which contains both sucralose and maltodextrin, altered gut bacteria in ways that promoted Crohn’s-type inflammation in genetically susceptible animals.
These findings come primarily from lab and animal studies, so the direct impact on a healthy human gut from typical dietary amounts isn’t fully settled. Still, the pattern is consistent enough that researchers have described maltodextrin as a “modern stressor of the intestinal environment.” People with inflammatory bowel disease or a family history of it may want to be especially mindful of how frequently it shows up in their diet.
Maltodextrin in Sports Nutrition
If you’ve used energy gels, sports drinks, or endurance supplements, you’ve almost certainly consumed maltodextrin. It’s a staple in athletic fueling for a simple reason: because each maltodextrin molecule contains up to 17 glucose units, it delivers far more energy per molecule than simple sugars like glucose or fructose. That means a drink can pack more fuel without increasing the total number of dissolved molecules.
This matters because your gut can generally tolerate only about a 6 to 8% carbohydrate concentration by weight before causing nausea or vomiting. By using maltodextrin instead of simple sugar, formulators squeeze more calories into that safe window. The tradeoff is that larger molecules like maltodextrin can be slightly slower to break down in the intestine than simple sugars, but for sustained endurance efforts lasting an hour or more, that’s often an advantage rather than a drawback.
Is It Gluten-Free?
In the United States, maltodextrin is almost always made from corn starch, making it naturally gluten-free. It can be derived from wheat, but even wheat-based maltodextrin is generally considered safe for people with celiac disease because the processing removes gluten proteins. The National Celiac Association considers it safe regardless of its starch source.
If wheat is used, U.S. labeling law requires it to be declared as an allergen, either in parentheses after the ingredient or in a “Contains” statement at the end of the ingredient list. So if you see “maltodextrin” on a label with no wheat declaration, it was made from a non-wheat source.
FDA Regulatory Status
The FDA classifies maltodextrin as “Generally Recognized as Safe” (GRAS) with no specific limit on how much can be used in food. It’s approved for production from corn, potato, and rice starch, and manufacturers can add it in whatever quantity current good manufacturing practices allow. This open-ended status means there’s no cap on how many products can contain it or how much a single product can include, which partly explains its ubiquity in processed foods.
On a nutrition label, maltodextrin’s calories count toward total carbohydrates. It won’t appear in the “sugars” line unless it has been broken down further, but its effect on blood sugar is comparable to or greater than sugar’s. If you’re tracking carbohydrate intake for blood sugar management, treating maltodextrin as nutritionally equivalent to sugar is a reasonable approach.