Does Maltodextrin Cause Inflammation In Your Gut?

Yes, maltodextrin can contribute to gut inflammation in some people. The evidence shows it is not inherently inflammatory for everyone, but under certain conditions—especially in people with sensitive guts, existing digestive disorders, or imbalanced gut bacteria—maltodextrin may promote low‑grade inflammation by disrupting the intestinal barrier and feeding harmful bacteria. The effect depends on the dose, your personal health, and the overall composition of your diet.

What Is Maltodextrin and Why Is It in So Many Foods?

Maltodextrin is a white powder made from starch. It comes from corn, rice, potato, or wheat. Manufacturers break down the starch into shorter chains of glucose molecules, creating a tasteless, easily digestible filler.

You find maltodextrin in thousands of packaged foods. It thickens sauces, improves texture in salad dressings, gives body to protein powders, bulks up artificial sweeteners, and helps extend shelf life. Sports drinks, candy, processed meats, and infant formulas also contain it.

Because it is quickly absorbed as glucose, maltodextrin has a high glycemic index—higher than table sugar. This rapid spike in blood sugar is one reason it appears in many studies about metabolic health. But the gut effects are a separate and more complex story.

How Could Maltodextrin Affect the Gut?

To understand whether maltodextrin can cause inflammation, you need to look at two main mechanisms. First, maltodextrin may alter the population of bacteria living in your large intestine. Second, it may weaken the mucus layer that protects the cells lining your gut.

Some research suggests that maltodextrin feeds certain types of bacteria—especially E. coli and other potentially harmful strains—while reducing the growth of beneficial bacteria like Bifidobacteria. When the balance tips toward more inflammatory bacteria, the immune system may respond with low‑grade inflammation.

In lab studies and in mice, maltodextrin has been shown to make the intestinal barrier more permeable. This means that substances that normally stay inside the gut can leak into the bloodstream, triggering an immune response. This process, often called “leaky gut,” is associated with chronic inflammation.

However, human evidence in healthy people without digestive problems is still limited. A person with a healthy gut and varied diet may not experience these changes at all.

Does Maltodextrin Cause Inflammation In Your Gut?

This is the question most people ask when they see maltodextrin on an ingredient list. The short answer: it can, but it does not for everyone. The research is strongest in people who already have gut‑related issues.

Lab studies consistently show that maltodextrin promotes the growth of inflammatory bacteria and disrupts the mucus barrier. In animal models, this leads to signs of colitis—inflammation of the colon. Human studies are fewer and less definitive. One small trial found that healthy volunteers who consumed maltodextrin for several days had a measurable increase in gut permeability. Other studies have linked high intakes of highly processed carbohydrates—including maltodextrin—with higher levels of inflammatory markers in the blood.

But correlation is not causation. People who eat a lot of maltodextrin tend to eat a lot of ultra‑processed foods overall. The inflammation could come from the overall dietary pattern, not from maltodextrin alone. At this point, the evidence supports the idea that maltodextrin is one factor that can promote gut inflammation, especially in people with vulnerable guts, but it is not a proven cause in the general population.

Who Might Be Most at Risk?

People with certain digestive conditions appear to be more sensitive to maltodextrin. These include:

• Irritable bowel syndrome (IBS) – Maltodextrin can ferment quickly, producing gas and bloating. Some people with IBS also have a low‑grade immune activation in the gut.
• Inflammatory bowel disease (IBD) – Crohn’s disease and ulcerative colitis are characterized by chronic inflammation. Early research suggests that maltodextrin may worsen symptoms by feeding harmful bacteria and weakening the gut barrier.
• Small intestinal bacterial overgrowth (SIBO) – Sugars and carbohydrates like maltodextrin can feed bacteria in the small intestine, aggravating symptoms.
• Mast cell activation disorders – Some individuals with mast cell disorders report flare‑ups after eating maltodextrin, possibly due to its effect on the gut lining.

If you have none of these conditions and eat a diverse diet rich in fiber, your risk of a significant inflammatory response from maltodextrin is probably low. The body can usually handle small amounts without trouble.

How Much Maltodextrin Is Too Much?

There is no official upper limit for maltodextrin. The U.S. Food and Drug Administration classifies it as Generally Recognized as Safe (GRAS), which means manufacturers can add it in amounts consistent with good manufacturing practice.

Most people get between 5 and 20 grams per day from processed foods, sometimes more if they use protein powders or sports drinks heavily. For reference, a tablespoon of corn syrup solids (another form of maltodextrin) contains about 12 grams. A single serving of some protein powders can have 15–25 grams of maltodextrin.

Some clinicians recommend limiting added maltodextrin to no more than 10–15 grams per day, especially for people with sensitive guts, but this is not a universal guideline. The safest approach is to pay attention to your own symptoms. If you notice bloating, gas, or loose stools after eating foods that contain maltodextrin, lowering your intake may help. If you have no reaction, the small amounts in most foods are unlikely to cause problems.

Should You Avoid Maltodextrin?

Avoiding maltodextrin entirely is difficult if you eat packaged foods. It is hidden in salad dressings, sauces, cereals, crackers, granola bars, meal replacements, and flavored yogurts. Reading ingredient labels is the only reliable way to find it.

For most healthy people, occasional maltodextrin is not a major health concern. Your gut has strong barriers and a resilient immune system that can handle small insults. The bigger issue is the overall quality of your diet. If your diet is high in fiber, vegetables, and whole foods, the occasional maltodextrin molecule is unlikely to tip the scale toward chronic inflammation.

However, if you have IBD, IBS, or another inflammatory condition, you may benefit from reducing or eliminating foods that list maltodextrin early in the ingredients. Some people with IBD report noticeable improvements in symptoms when they cut out maltodextrin. This is not proven in large clinical trials, but it is consistent with the biological mechanisms.

The evidence does not support a blanket recommendation for everyone. The most honest answer is: for some people, yes, it can be a problem. For others, it is harmless. Knowing your own gut is key.