Study links high xylitol blood levels to increased risk of heart attacks and strokes

Research presented at Munich cardiology congress

Researchers from the Charité University Hospital in Berlin have identified an association between elevated blood levels of the sweetener xylitol and an increased risk of heart attacks, strokes, and death. The findings were presented at the European Society of Cardiology annual congress in Munich. Xylitol is a sugar alcohol that occurs naturally in minute quantities in certain foods, but industrial manufacturers incorporate it in concentrations up to 1,000 times higher. The substance is widely used as a sugar substitute in sugar-free chewing gum, toothpaste, mouthwash, jams, yoghurts, and ice cream. While dentists often recommend xylitol because it inhibits cavity-causing bacteria, researchers noted that its long-term cardiovascular effects had not been extensively evaluated across large populations.

Elevated risk across multi-decade tracking

The study evaluated blood samples and medical records from 17,710 individuals to assess how xylitol concentrations affect cardiovascular outcomes over time. Researchers compared the 25% of participants with the highest blood levels of the compound against the 25% with the lowest levels. Participants in the highest quartile faced a 57% higher probability of suffering a heart attack, experiencing a stroke, or dying within six years compared to those in the lowest quartile. The association persisted over extended observation periods, with the highest-intake cohort remaining 18% more likely to experience adverse cardiac events after 30 years.

Analysis across all four quartiles demonstrated a dose-dependent relationship, meaning cardiovascular event rates climbed consistently alongside rising blood xylitol levels. The correlation remained steady regardless of baseline participant characteristics such as age and sex. Researchers also confirmed that the statistical link was independent of body mass index, hypertension, diabetes, and blood lipid levels, factors that frequently lead individuals to choose low-calorie dietary sweeteners.

Biological mechanisms and clinical background

The findings build on earlier laboratory investigations into how sugar alcohols alter human circulatory function. Dr Marco Witkowski, the lead study author from Charité University Hospital, noted that prior experiments demonstrated how the compound directly affects blood coagulation.

In previous studies, we showed that xylitol can enhance the ability of platelets to form clots.

These platelet clots can dislodge and block blood vessels, creating medical emergencies such as heart attacks, strokes, or pulmonary embolisms. In 2024, the team published a study in the European Heart Journal examining 3,300 cardiovascular patients over three years, which revealed elevated cardiac risks tied to blood xylitol levels. The newly presented work expands that scope from pre-existing heart patients to the broader population over multi-decade timeframes.

Regulatory standing and public consumption

Public health agencies currently classify xylitol as safe, and consumers frequently turn to it under the assumption that sugar substitutes offer a harmless dietary alternative. Witkowski addressed this gap between public perception and clinical data during his congress presentation.

Artificial sweeteners are consumed by people who think they are healthier than sugar and they are generally regarded as safe by regulatory agencies.

Study authors pointed out that the results demonstrate an association rather than proving that xylitol directly causes adverse cardiovascular events. Dan Atar from the European Society of Cardiology noted that the findings provide an important impetus for further clinical research.