Maltodextrin is not an artificial sweetener. It’s a starch-derived carbohydrate that contains roughly the same number of calories per gram as table sugar. The confusion likely comes from seeing maltodextrin listed on the ingredient labels of products marketed as “sugar-free” or alongside actual artificial sweeteners like sucralose and stevia.
What Maltodextrin Actually Is
Maltodextrin is a polysaccharide, which means it’s a chain of glucose (sugar) molecules linked together. It’s made by partially breaking down grain starches, usually from corn or wheat, using enzymes or acids. The final product is a white, nearly tasteless powder containing an average of 3 to 17 glucose units per chain. Think of it as starch that’s been chopped into smaller pieces but not broken down all the way into pure sugar.
Because it’s derived from a natural starch through hydrolysis rather than synthesized in a lab, it doesn’t qualify as artificial. And because it carries about 4 calories per gram (the same as any carbohydrate), it doesn’t qualify as a non-nutritive sweetener either. It sits in a middle zone: less sweet than sugar, but just as calorie-dense.
How It Differs From Artificial Sweeteners
The FDA recognizes six non-nutritive sweeteners: aspartame, acesulfame potassium, advantame, neotame, saccharin, and sucralose. These compounds are anywhere from 200 to 20,000 times sweeter than table sugar, which is why only tiny amounts are needed. They provide zero or near-zero calories because the body either can’t digest them or uses so little that the calorie contribution is negligible.
Maltodextrin works nothing like these. It isn’t intensely sweet. It has a glycemic index of about 110, which is actually higher than table sugar (around 65) and even higher than pure glucose (100). That means maltodextrin spikes blood sugar faster than the sugar in your kitchen. This alone disqualifies it from the “sugar substitute” category in any meaningful sense.
Why It Shows Up in “Sugar-Free” Products
Here’s where the confusion starts. High-potency sweeteners like sucralose and stevia are so concentrated that you’d need a nearly invisible amount to sweeten a cup of coffee. You can’t package an invisible amount into a convenient packet. Manufacturers use maltodextrin (and sometimes dextrose) as a bulking agent to give those packets enough physical volume that you can actually scoop or pour them.
Splenda, for example, lists both dextrose and maltodextrin alongside sucralose. The sucralose provides the sweetness. The maltodextrin provides the bulk. That combination brings each packet to about 3.36 calories, which FDA rounding rules allow to be labeled as zero. So maltodextrin isn’t doing the sweetening. It’s just making the product usable.
What Maltodextrin Does in Food
Beyond sweetener packets, maltodextrin appears in a wide range of processed foods for reasons that have nothing to do with sweetness. It thickens sauces and salad dressings, giving them a denser texture. It extends shelf life by stabilizing ingredients that would otherwise separate or degrade. It acts as a filler in spice mixes, protein powders, and snack foods, adding volume without dramatically changing flavor. Sports gels and energy drinks use it as a fast-absorbing carbohydrate source precisely because of that high glycemic index.
On a nutrition label, maltodextrin appears in the ingredient list but is not classified as an “added sugar” under FDA rules. Added sugars include things like sucrose, dextrose, honey, and concentrated fruit juice. Maltodextrin falls outside that definition despite behaving similarly in your bloodstream. This means a product can contain significant maltodextrin without it showing up in the “added sugars” line, which can be misleading if you’re tracking sugar intake.
Blood Sugar and Gut Health Concerns
The glycemic index of 110 matters for anyone managing blood sugar. Maltodextrin is rapidly digested and absorbed, producing a sharper glucose spike than eating the same amount of table sugar. For people with diabetes or insulin resistance, this makes maltodextrin worth watching on ingredient labels, even in products that seem healthy like protein bars or fiber supplements.
Research has also raised concerns about maltodextrin’s effects on gut health. A study published in Frontiers in Immunology found that maltodextrin consumption in animal models reduced the diversity of gut bacteria, decreased the number of mucus-producing cells lining the intestine, and allowed gut bacteria to move closer to the intestinal wall. Specifically, beneficial bacteria like Ruminococcus decreased while Bacteroides increased, a pattern that mirrors changes seen in people with inflammatory bowel disease. The researchers also observed reduced levels of acetic acid, a short-chain fatty acid that plays a role in maintaining gut barrier function. These findings don’t prove maltodextrin causes gut disease in humans, but they suggest that frequent consumption in processed foods could be a contributing factor for people already at risk.
How to Spot It on Labels
Maltodextrin will appear by name in the ingredient list. It won’t be hiding under an alias, though it’s sometimes listed alongside similar starch derivatives like dextrin or modified food starch. If you’re trying to limit your intake, check ingredient lists on flavored yogurts, instant soups, salad dressings, protein powders, sugar-free sweetener packets, and snack chips. It’s one of the most common food additives in processed foods, appearing in products you wouldn’t expect to contain a starch-based filler.
The key takeaway is simple: maltodextrin is a processed carbohydrate, not a sweetener. It has real calories, raises blood sugar quickly, and serves primarily as a thickener, filler, or bulking agent. If you see it on a label, treat it the way you’d treat any refined starch rather than grouping it with zero-calorie sugar alternatives.