Yes, maltodextrin raises blood sugar, and it does so quickly. With a glycemic index of 100 on the glucose scale, maltodextrin spikes blood sugar as fast as pure glucose itself. That makes it one of the highest-GI carbohydrates found in everyday processed foods, sports drinks, and supplements.
Why Maltodextrin Hits So Hard
Maltodextrin is a white powder made by partially breaking down corn, potato, or rice starch. The result is short chains of glucose molecules linked together, and your body splits them apart rapidly during digestion. Unlike table sugar (sucrose), which is half fructose and has a moderate glycemic index of 62, maltodextrin is essentially all glucose. That means it enters your bloodstream fast and triggers a strong insulin response to match.
For context, most people think of white bread or candy as “high glycemic.” Maltodextrin meets or exceeds both. It’s added to a surprisingly wide range of products: salad dressings, protein bars, flavored yogurts, instant soups, sauces, and many “sugar-free” snacks that use it as a filler or texturizer.
What Happens If You Have Type 2 Diabetes
The blood sugar spike from maltodextrin is more pronounced in people with type 2 diabetes than in those without. In a clinical study published in Nutrients, researchers tracked continuous glucose readings in 14 people with type 2 diabetes and 7 without diabetes over two weeks. When maltodextrin was added to meals, the diabetic group saw significant postprandial rises across every measured time window. Mid-morning glucose jumped from an average of 7.66 mmol/L to 9.71 mmol/L, a clinically meaningful increase.
There was one interesting finding: the spike was worst during the first three days. By days five through seven, the area under the glucose curve was no longer significantly different from the control period without maltodextrin. The researchers observed a gradual blunting of postprandial highs over time. Overnight fasting glucose levels were not affected at all, and no patients required changes to their diabetes medications during the study.
Still, that initial surge matters. If you’re managing blood sugar day to day, even a temporary spike into the 9 to 10 mmol/L range (roughly 160 to 180 mg/dL) can be enough to throw off your targets, especially if maltodextrin shows up in foods you didn’t realize contained it.
Maltodextrin vs. Resistant Maltodextrin
Not everything labeled “maltodextrin” behaves the same way. Resistant maltodextrin (sometimes sold under the brand name Fibersol-2) is chemically modified so that your small intestine can’t fully break it down. It’s classified as a non-viscous soluble fiber and passes to the colon, where gut bacteria ferment it instead. Several studies have found that resistant maltodextrin may actually improve blood sugar and insulin sensitivity rather than spike them, and it can promote satiety.
The catch is that most food labels simply say “maltodextrin” without specifying which type. If a product lists maltodextrin as an ingredient alongside a fiber claim, it may contain the resistant version. But standard maltodextrin in the vast majority of processed foods is the rapidly digested kind.
Why Athletes Use It on Purpose
The same property that makes maltodextrin problematic for blood sugar management makes it useful for endurance athletes. Current sports nutrition guidelines recommend 1.0 to 1.2 grams of carbohydrate per kilogram of body weight per hour to replenish muscle glycogen after exhaustive exercise. Maltodextrin is a go-to ingredient in recovery drinks because it delivers glucose to muscles quickly without the heavy sweetness of sugar.
A common formulation pairs fructose with maltodextrin in a 1:1.5 ratio. Research published in Frontiers in Nutrition found that this combination during a four-hour recovery window enhanced subsequent endurance performance compared to glucose-only drinks. For a 70-kilogram (154-pound) athlete, that translates to roughly 70 to 84 grams of carbohydrate per hour of recovery, a dose that would be excessive for someone simply eating a meal.
Outside of athletic recovery, there’s rarely a reason to seek out maltodextrin as a carbohydrate source. Whole grains, fruits, and starchy vegetables provide glucose alongside fiber, vitamins, and minerals that slow absorption and reduce the glycemic hit.
Gut Health Concerns With Regular Use
Beyond blood sugar, frequent maltodextrin intake may affect your gut in ways that aren’t immediately obvious. Research from the National Institutes of Health found that maltodextrin impaired cellular antibacterial defenses in the intestine. In animal studies, maltodextrin consumption led to expansion of E. coli populations in the gut and enhanced the ability of harmful bacterial strains to adhere to intestinal walls and form biofilms.
Researchers also observed that commensal (normally harmless) bacteria were found penetrating the protective mucous barrier and making direct contact with the intestinal lining in maltodextrin-supplemented mice. While this didn’t cause outright intestinal disease in healthy animals, the authors noted it could prime the intestine for disease development over time. Separately, patients with ileal Crohn’s disease were found to have gut microbiomes enriched for maltodextrin metabolism compared to non-IBD controls, raising questions about a possible link between chronic maltodextrin exposure and inflammatory bowel conditions.
How to Spot It and Limit Exposure
The FDA classifies maltodextrin as Generally Recognized as Safe (GRAS) with no specific daily intake limit. The regulation simply states it can be used in food “with no limitation other than current good manufacturing practice.” That means there’s no official cap telling manufacturers how much they can add, and no guideline telling consumers how much is too much.
Maltodextrin often hides in foods that don’t taste sweet. Check ingredient lists on items like powdered spice blends, canned soups, frozen meals, infant formula, and even medications or supplements. It’s frequently the first or second ingredient in mass-gainer powders and some meal replacement shakes. If you’re tracking carbohydrate intake for blood sugar control, treat maltodextrin the same way you’d treat pure glucose: it counts fully, and it counts fast.