Xylitol has built its reputation as one of the “safer” sugar substitutes — it’s added to sugar-free gum specifically because it helps prevent cavities, and it shows up in jam, yogurt, ice cream, and toothpaste as a low-calorie sweetener. A large new study is complicating that reputation, finding a substantial jump in cardiovascular risk among people with the highest blood levels of it.
Key Takeaways
- A new study of 17,710 people, combining data from the Canadian Longitudinal Study on Aging and the UK’s EPIC-Norfolk study, found those with the highest blood xylitol levels had a 57% greater risk of major cardiovascular events over six years than those with the lowest levels.
- “Major cardiovascular events” in this study meant cardiovascular death, heart attack, or stroke — and the increased risk held up even after adjusting for age, sex, smoking, diabetes, high blood pressure, and cholesterol.
- This builds on earlier 2024 research from the same Cleveland Clinic team, which first linked elevated xylitol to cardiovascular risk and found it made blood platelets more prone to clotting in lab and animal experiments.
- The researchers and independent experts are both clear that this shows an association, not proof that xylitol itself causes heart attacks or strokes.
What the New Study Adds
Led by Dr. Marco Witkowski and the same Cleveland Clinic research team behind the original 2024 findings, this new study set out to validate that earlier work in a much larger, more geographically diverse group. Researchers divided the combined 17,710 participants by blood xylitol concentration and compared outcomes between the highest and lowest groups over six years of follow-up. People in the highest xylitol group had a 57% greater risk of major adverse cardiovascular events — a category that included cardiovascular death, heart attack, and stroke — even after statistically accounting for standard risk factors like smoking, diabetes, hypertension, and cholesterol levels.
Why Researchers Think This Might Be Happening
The 2024 study that preceded this one didn’t just find a statistical association — it also tested a possible mechanism directly. In lab and animal experiments, adding xylitol enhanced how easily blood platelets clumped together and formed clots, an effect regular sugar didn’t produce. That gives the newer, larger population finding a plausible biological explanation, rather than leaving it as a statistical pattern with no proposed mechanism behind it.
How Much Xylitol Is Actually in These Products
Researchers noted that xylitol is added to processed foods and gum in concentrations roughly 1,000 times higher than the trace amounts found naturally in some fruits and vegetables. It shows up across a wide range of everyday products: sugar-free chewing gum, toothpaste, jam, yogurt, and ice cream, generally marketed as a “healthier” sugar alternative, particularly for people managing diabetes or trying to reduce sugar intake.
What Independent Experts Are Saying
Dell Stanford, a senior dietitian at the British Heart Foundation who wasn’t involved in the research, said artificial sweeteners like xylitol are typically viewed as a healthier swap, and that it’s important to understand whether what’s being added to food could be contributing to cardiovascular risk over time. Researchers and outside commentators were also careful to note what the study doesn’t show: this is an observational association, not proof that xylitol-containing products directly cause heart attacks or strokes, and the researchers themselves have called for further investigation into the long-term cardiovascular safety of xylitol and other sugar alcohols.
How Other Countries Are Responding
The findings arrive as some regulators are already taking a more cautious stance on xylitol specifically. Singapore has moved to restrict ordinary chewing-gum sales and imports, though this isn’t a blanket ban on xylitol itself and includes exemptions for approved health-related products. Whether other regulators will revisit xylitol’s safety classification in light of this newer, larger study remains to be seen.
What This Means for You
This isn’t a reason to panic over the occasional stick of sugar-free gum or spoonful of jam. The study looked at people with the highest circulating xylitol levels, which likely reflects more regular, higher-volume consumption rather than occasional use. If you regularly consume multiple xylitol-containing products throughout the day — gum, candy, baked goods, and yogurt together, for instance — it may be worth checking ingredient labels and discussing your overall sweetener intake with a doctor or dietitian, particularly if you already have cardiovascular risk factors. As with the 2024 findings on erythritol, a related sugar alcohol, this is an active, evolving area of research rather than a settled question.
Sources: Witkowski, M., et al. (2026). Xylitol and cardiovascular risk validation study, Canadian Longitudinal Study on Aging and EPIC-Norfolk cohorts; Witkowski, M., et al. (2024). Xylitol is prothrombotic and associated with cardiovascular risk. European Heart Journal, 45(27), 2439-2452; The Guardian, “Sweetener xylitol, used in chewing gum and jam, linked to strokes and heart attacks – study” (Aug. 28, 2026).