A 17,710-person analysis found higher blood xylitol levels were associated with more heart attacks, strokes and deaths, but the research does not prove that consuming xylitol causes those events.
Higher blood xylitol levels were linked to more cardiovascular events
A large observational study presented at ESC Congress 2026 has added to concerns about xylitol, a sugar alcohol used in some sugar-free foods, chewing gums and oral-care products. The European Society of Cardiology reported that researchers followed 17,710 people across two cohorts and found that those with the highest blood xylitol concentrations experienced more major cardiovascular events than those with the lowest levels.
The finding is important, but it needs careful interpretation. Researchers measured xylitol circulating in participants’ blood, not how many pieces of xylitol gum they chewed or how much xylitol-sweetened food they ate. Xylitol is also produced naturally in the body during glucose metabolism, so a high blood level is not the same thing as a high dietary intake.
What the study found at a glance
• Researchers analyzed 17,710 adults from the Canadian Longitudinal Study on Aging and EPIC-Norfolk in the United Kingdom.
• In the Canadian cohort, the highest xylitol group had a 57% higher adjusted risk of death, heart attack or stroke over six years than the lowest group.
• In EPIC-Norfolk, the highest xylitol group had an 18% higher risk of major cardiovascular events over 30 years.
• The pattern was observational and cannot prove that xylitol consumption caused the events.
• The study did not identify a dietary xylitol dose that is known to increase cardiovascular risk.
What the 2026 study found
The research team examined two prospective observational cohorts: the Canadian Longitudinal Study on Aging, or CLSA, and the European Prospective Investigation into Cancer and Nutrition Norfolk study, known as EPIC-Norfolk. Participants were grouped according to blood xylitol concentration and followed for major adverse cardiovascular events.
For this analysis, a major adverse cardiovascular event included death, myocardial infarction or stroke. In the Canadian cohort, researchers adjusted for established cardiovascular risk factors including age, sex, smoking, lipid levels, diabetes and hypertension.
| Cohort | Follow-up | Highest vs. lowest xylitol group |
|---|---|---|
| CLSA, Canada | 6 years | 57% higher adjusted risk of a major adverse cardiovascular event. |
| EPIC-Norfolk, UK | 30 years | 18% higher risk of major adverse cardiovascular events. |
The ESC said results across the middle quartiles were consistent with a dose-dependent relationship in blood measurements: as circulating xylitol levels increased, cardiovascular event rates also increased. That strengthens the association, but it still does not establish cause and effect.
Why the new results are getting attention
The 2026 analysis follows a 2024 Cleveland Clinic-led study published in the European Heart Journal. That earlier work also linked higher circulating xylitol with cardiovascular events and reported laboratory evidence that xylitol could increase platelet reactivity and thrombosis potential.
In the 2024 research, a small intervention involving 10 healthy volunteers found that a xylitol-sweetened drink sharply increased plasma xylitol and measures of platelet responsiveness. Those experiments provide a possible biological mechanism for the association seen in observational data, but they do not show the long-term effect of ordinary xylitol use in the general population.
The biggest limitation: blood xylitol is not the same as xylitol intake
This is the central caveat for consumers. Xylitol occurs naturally in the body as a byproduct of glucose metabolism, so blood concentration reflects more than what a person has recently eaten. The 2026 study therefore cannot tell readers how many grams of xylitol, pieces of gum or servings of a xylitol-sweetened product would increase risk.
The findings were presented at ESC Congress 2026 and, as of September 9, had not been published as a full peer-reviewed journal article. Conference findings can be valuable, but the full methods and analyses have not yet undergone the same public journal-review process as the 2024 European Heart Journal paper.
Where xylitol is commonly found
Xylitol is a sugar alcohol used as a sugar substitute in products such as sugar-free chewing gum, candies, cookies and other low-sugar foods. The U.S. Food and Drug Administration lists xylitol among sugar alcohols used as sugar substitutes. Sugar alcohols are slightly lower in calories than sugar and do not cause the same sudden rise in blood glucose.
Xylitol also appears in some oral-care products. That does not mean exposure from brushing with a toothpaste should be treated as equivalent to regularly consuming xylitol-sweetened foods or beverages. The 2026 cohort study did not measure those exposures separately.
What about xylitol chewing gum?
Sugar-free chewing gum has recognized oral-health benefits that are not limited to xylitol. The American Dental Association says chewing sugar-free gum can stimulate saliva flow, which helps dilute and neutralize plaque acids. Sugar-free gums may use xylitol or several other sweeteners.
The cardiovascular research does not identify a specific amount of xylitol gum as safe or unsafe. People with cardiovascular disease or multiple risk factors who consume large amounts of xylitol-sweetened products may want to discuss the findings with a qualified health professional instead of making abrupt changes based on a single conference presentation.
Should you stop using xylitol?
Current evidence supports caution and more research, not a conclusion that ordinary xylitol consumption directly causes heart attacks or strokes. The new study strengthens a recurring association between higher circulating xylitol and cardiovascular events, but it does not establish causation or define a harmful dietary dose.
For everyday decisions, checking ingredient labels and considering the overall diet is more useful than assuming every sugar-free product is automatically healthier. Anyone with a history of heart attack, stroke, clotting disorders or substantial cardiovascular risk should discuss major dietary changes with a clinician who knows their medical history.
Questions readers are asking
Does xylitol cause heart attacks?
The 2026 study does not prove that xylitol causes heart attacks. It found an association between higher blood xylitol levels and a higher rate of major cardiovascular events.
Is xylitol gum unsafe?
The study did not determine a safe or unsafe amount of xylitol chewing gum. It measured circulating xylitol levels, not gum intake.
Why can blood xylitol be high even without eating much of it?
The human body produces small amounts of xylitol during normal glucose metabolism, which means blood levels are not a direct measurement of dietary consumption.
What the evidence means now
The latest findings add weight to a possible cardiovascular safety signal around xylitol. Across two large populations, higher blood levels were associated with more serious cardiovascular events, and earlier laboratory work offers a plausible clotting-related mechanism. At the same time, the evidence still cannot show that consuming xylitol caused those events, and it cannot tell consumers what dietary dose, if any, would raise risk. Those limits are essential to any responsible reading of the research.
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