ESC 2026 Study Links Higher Blood Xylitol to Cardiovascular Risk

Higher measured levels of xylitol in blood were associated with a greater subsequent risk of major adverse cardiovascular events—heart attack, stroke, or cardiovascular death—in an analysis presented at the 2026 European Society of Cardiology (ESC) Congress. The finding is important, but it is not evidence that eating a xylitol-containing gum, mint, or food causes cardiovascular disease. 810

What the ESC 2026 analysis found

Dr. Marco Witkowski of Charité University Hospital in Berlin and colleagues analyzed 17,710 people in two prospective population cohorts: the Canadian Longitudinal Study on Aging (CLSA) and the UK EPIC-Norfolk study. 1015

In the CLSA cohort, followed for six years, participants with blood xylitol levels in the highest quarter had a 57% higher risk of the composite cardiovascular outcome than those in the lowest quarter. The result was reported after accounting for known cardiovascular risk factors. 8

In EPIC-Norfolk, with follow-up of up to 30 years, the highest-xylitol group had an 18% higher risk than the lowest group. Researchers also reported a dose-response pattern: cardiovascular-event rates increased as blood xylitol concentrations rose across the groups, rather than differing only between the highest and lowest categories.

The reported associations remained after adjustment for factors including age, sex, smoking, body-mass index, blood lipids, diabetes, and hypertension. Adjustment can reduce the influence of these known differences between groups, but it cannot eliminate every possible confounder. 8

What the 57% figure does—and does not—mean

The 57% result is a relative comparison between people with the highest and lowest measured blood-xylitol concentrations in the Canadian cohort. It does not mean that 57% of people who consume xylitol will have a cardiovascular event, nor does it provide an individual person’s absolute risk. 8

It also does not establish that dietary xylitol was the reason one group had higher blood levels or higher event rates. A blood measurement is not the same thing as a direct record of how much xylitol someone consumed.

Why researchers are examining a possible mechanism

The congress presentation follows a 2024 peer-reviewed study from the research group. That work reported that higher circulating xylitol was associated with incident major adverse cardiovascular events; in a validation cohort, the adjusted hazard ratio for the highest versus lowest xylitol tertile was 1.57. It also found that xylitol increased several measures of platelet reactivity and enhanced thrombosis in experimental studies. 1

Those platelet findings provide a possible biological explanation for an association with clot-related events such as heart attack and stroke. They do not, by themselves, prove that the platelet effect explains the long-term cohort findings or that ordinary dietary exposure causes clinical events. 1

The crucial limitations

The ESC 2026 analysis was observational. It can show that higher blood xylitol and later cardiovascular events occurred together more often than expected after statistical adjustment; it cannot determine whether xylitol caused those events. 89

The research was presented at a scientific congress, and reporting around the presentation described it as unpublished or not yet peer reviewed. Independent review, full methods, and replication are therefore especially important before drawing firm dietary conclusions. 915

There is another key uncertainty: circulating xylitol may reflect more than intake from sugar-free products. Xylitol is a metabolite, so measured levels may also be influenced by endogenous metabolic processes. That leaves open the possibility of residual confounding or reverse causation—for example, that underlying metabolic or health differences contribute to both xylitol levels and cardiovascular risk.

What to do with the finding now

The evidence supports caution and further research, not panic or an immediate conclusion that every product containing xylitol is unsafe. The ESC described the results as a reason for further studies on the safety of xylitol and other artificial sweeteners.

For people trying to improve cardiovascular health, the broader dietary priority remains more useful than swapping one sweetener for another: reduce reliance on heavily processed sweet foods and drinks where practical, rather than replacing them with large amounts of added sugar. This study does not show that replacing xylitol with sugar would improve heart health.

People with cardiovascular disease, diabetes, kidney disease, or questions about regular use of sugar substitutes should discuss their overall diet and risk profile with a clinician. The next research step is to clarify how blood xylitol is generated, replicate the cohort findings, and test whether dietary exposure itself changes cardiovascular risk.