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Introduction
For decades, health-conscious consumers have reached for sugar-free products to satisfy their sweet tooth without the calories. Xylitol, a popular sugar alcohol found in everything from sugar-free gum to toothpaste, has been marketed as a natural, diabetes-friendly alternative to sugar. But a landmark 2024 study from the Cleveland Clinic has raised serious questions about whether this seemingly innocuous sweetener might actually be harming our hearts.
The research, published in the European Heart Journal, found that. More importantly, the study went beyond mere correlation to uncover a potential mechanism: xylitol appears to make blood platelets more prone to clotting.
Understanding Xylitol: More Than Just a Sugar Substitute
Xylitol belongs to a class of compounds called sugar alcohols or polyols. These are carbohydrates that chemically resemble both sugars and alcohols, though they don’t contain ethanol. In small quantities, xylitol occurs naturally in fruits and vegetables, and the human body even produces tiny amounts as a byproduct of normal glucose metabolism.
However, the xylitol found in commercial products is manufactured on an industrial scale and used in quantities far exceeding those found in nature.
When you consume a xylitol-sweetened beverage or chew a piece of xylitol gum, your blood levels of this compound can spike to 1,000 times higher than what your body normally produces on its own.
The global market for xylitol reached $701.3 million in 2023, reflecting its widespread adoption in products labeled as “sugar-free,” “keto-friendly,” or “diabetes-friendly”. It’s particularly common in oral care products, where it has earned a reputation for preventing tooth decay.
The Cleveland Clinic Study: A Multi-Pronged Investigation
The research team, led by Dr. Stanley Hazen, Chair of Cardiovascular and Metabolic Sciences at Cleveland Clinic’s Lerner Research Institute, conducted a comprehensive investigation using three complementary approaches.
Part 1: Observational Analysis
The researchers began by analyzing fasting blood samples from over 3,300 adults in the United States and Europe who were undergoing elective cardiac evaluations. These participants were then followed for three years to track major adverse cardiovascular events (MACE), which included heart attacks, strokes, or death.
Using sophisticated metabolomics techniques, the team screened the blood samples for chemical signatures that could predict future cardiovascular events. To their surprise, xylitol emerged as a significant predictor.
The results were striking: participants with the highest levels of circulating xylitol had a 57% higher risk of experiencing a cardiovascular event compared to those with the lowest levels. This association remained significant even after adjusting for traditional cardiovascular risk factors such as age, diabetes, and high blood pressure.
Part 2: Mechanistic Studies
To determine whether xylitol might actually cause cardiovascular problems—rather than simply being a marker for some other underlying issue—the researchers conducted a series of laboratory experiments.
They tested the effects of xylitol on human platelets, the tiny cell fragments that circulate in our blood and help form clots to stop bleeding. Under normal circumstances, platelets remain relatively inactive until they encounter a signal indicating damage to the blood vessel wall. This prevents unnecessary clotting that could block blood flow.
The results were concerning: xylitol enhanced platelet reactivity at concentrations comparable to those observed in the fasting plasma of the study participants.
In other words, at levels that people actually achieve after consuming xylitol-sweetened products, platelets became more sensitive to clotting signals.
In complementary experiments using animal models, xylitol showed similar effects on thrombosis formation in vivo. Every measure of clotting ability increased when xylitol was present.
Part 3: Human Intervention Study
The most direct evidence came from a clinical intervention study involving 10 healthy volunteers. These participants were given either a xylitol- or glucose-sweetened drink, and their platelet function was monitored before and after consumption.
The findings were dramatic: every measure of platelet clotting ability significantly increased immediately following ingestion of the xylitol-sweetened drink—but not the glucose-sweetened drink.
This provided direct evidence that xylitol consumption, at least in the short term, has measurable effects on blood clotting potential in humans.
Why This Matters: The Biology of Blood Clots
To understand why these findings are significant, it helps to understand how heart attacks and strokes occur.
Most heart attacks and many strokes are caused by thrombosis—the formation of a blood clot that blocks blood flow to a vital organ. When a clot blocks a coronary artery, heart muscle begins to die, resulting in a heart attack. When a clot blocks blood flow to the brain, the result is a stroke.
Platelets play a central role in this process. Under normal conditions, they circulate in a resting state, ready to spring into action when needed. But when platelets become hyperreactive or overly sensitive to clotting signals, they can form clots even when there’s no actual injury to repair. This can lead to the kind of dangerous clots that cause cardiovascular events.
The Cleveland Clinic study suggests that xylitol may push platelets into this hyperreactive state, potentially increasing the risk of dangerous clot formation.
Connections to Earlier Research
This isn’t the first time Dr. Hazen’s team has raised concerns about sugar alcohols. In 2023, they published similar findings regarding erythritol, another popular sugar substitute. That study found a comparable association between elevated erythritol levels and cardiovascular risk.
Together, these findings suggest that the issue may not be limited to a single sugar alcohol but might extend to this entire class of sweeteners.
Important Caveats and Limitations
While the findings are concerning, it’s important to understand the study’s limitations.
First, the observational studies demonstrate association, not causation. This means that while high xylitol levels are correlated with cardiovascular risk, we cannot definitively conclude from these studies alone that xylitol causes heart attacks or strokes.
Second, the human intervention study was small, involving only 10 healthy volunteers. While the results were consistent across all participants, larger studies are needed to confirm the effects.
Third, the study measured circulating xylitol levels, which reflect recent consumption. The long-term effects of chronic xylitol consumption on cardiovascular health remain unclear, and further studies assessing the long-term cardiovascular safety of xylitol are warranted.
Finally, the study didn’t distinguish between different sources of xylitol. It’s possible that occasional exposure through toothpaste or small amounts in food may have different effects than regular consumption of large quantities in sugar-free beverages or candies.
What About Toothpaste?
Dr. Hazen was careful to note that the findings don’t mean people should stop using toothpaste containing xylitol.
“It does not mean throw out your toothpaste if it has xylitol in it,” he said in a press release. “But we should be aware that consumption of a product containing high levels could increase the risk of blood clot-related events. “
The distinction is between topical use (where xylitol is applied to teeth and gums but is largely swallowed only in small amounts) and ingestion (where xylitol is consumed in significant quantities through food and beverages).
What Should Consumers Do?
For those concerned about these findings, the study authors offer practical guidance.
Talk to your doctor or a certified dietitian about healthy food choices and for personalized recommendations. This is particularly important for individuals with existing cardiovascular risk factors or those who regularly consume sugar-free products.
Read labels carefully. Xylitol may be listed under various names, including wood sugar, birch sugar, or birch bark extract. Products that commonly contain xylitol include:
- Sugar-free candy and mints
- Sugar-free gum
- Sugar-free desserts
- Mouthwashes and toothpastes
- Cough syrups
- Dietary supplements
Be particularly cautious with products that contain high amounts. The risk appears to be associated with ingestion of products containing high levels of xylitol, not incidental exposure.
Consider the broader context. Xylitol and other sugar alcohols are increasingly recommended as alternatives to sugar for people with diabetes or those trying to lose weight. However, this study adds to a growing body of evidence suggesting that these substitutes may not be as harmless as once thought.
The Broader Scientific Context
The study raises important questions about how we evaluate the safety of food additives.
Sugar alcohols like xylitol have historically been considered safe because they don’t raise blood sugar as much as regular sugar and have fewer calories. The European Food Safety Authority has recognized xylitol’s benefits for dental health.
However, the longstanding assumption that these compounds are universally beneficial may need to be reconsidered. As Dr. Hazen noted, “This study again shows the immediate need for investigating sugar alcohols and artificial sweeteners, especially as they continue to be recommended in combatting conditions like obesity or diabetes”.
The research also highlights the importance of studying the effects of food additives on specific biological pathways—in this case, platelet function and thrombosis—rather than assuming that because a substance is “natural” or “low-calorie,” it must be safe.
Conclusion: Key Takeaways
The Cleveland Clinic study on xylitol and cardiovascular risk represents an important contribution to our understanding of how sugar substitutes may affect human health. While further research is needed to fully understand the long-term implications, the findings suggest that consumers should be aware of potential risks associated with high xylitol consumption.
Key Takeaways from the Article:
- High blood levels of xylitol are associated with a 57% increased risk of cardiovascular events (heart attack, stroke, or death) over a three-year period.
- Xylitol appears to make blood platelets more reactive, potentially increasing the risk of dangerous blood clots.
- A human intervention study found that consuming a xylitol-sweetened drink increased platelet-clotting ability, while a glucose-sweetened drink did not.
- The study was observational, meaning it shows association but not definitive causation; larger and longer studies are needed.
- Occasional exposure through toothpaste or small amounts in food is unlikely to be harmful, but regular consumption of high-dose xylitol products may increase risk.
- People with cardiovascular risk factors should talk to their doctor or dietitian about whether to limit xylitol consumption.
- This is the second major study from Cleveland Clinic linking sugar alcohols to cardiovascular risk, following similar findings for erythritol in 2023.
- The findings suggest that sugar alcohols should not be assumed to be universally safe simply because they are “natural” or “low-calorie,” and further investigation is warranted.
As with many areas of nutrition science, the story of xylitol is more complex than it initially appeared. While the compound may offer benefits for dental health and provide a low-calorie alternative for those managing diabetes, the potential cardiovascular risks identified in this study suggest that moderation and awareness are warranted—particularly for individuals who regularly consume large quantities of sugar-free products.
Don’t Get Sick!
About Dr. Jesse Santiano, MD
Dr. Santiano is a retired internist and emergency physician with extensive clinical experience in metabolic health, cardiovascular prevention, and lifestyle medicine. He reviews all medical content on this site to ensure accuracy, clarity, and safe application for readers. This article is for educational purposes and is not a substitute for personal medical care.
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References:
- Witkowski, M., Nemet, I., Li, X. S., Wilcox, J., Ferrell, M., Alamri, H., Gupta, N., Wang, Z., Tang, W. H. W., & Hazen, S. L. (2024). Xylitol is prothrombotic and associated with cardiovascular risk. European Heart Journal, *45*(27), 2439–2452. https://doi.org/10.1093/eurheartj/ehae244
- Witkowski, M., & Hazen, S. L. (2025). Xylitol and cardiovascular risks. European Heart Journal, *46*(27), 2707–2708. https://doi.org/10.1093/eurheartj/ehaf059
- Witkowski, M., & Hazen, S. L. (2025). Erythritol and xylitol and cardiovascular disease risk: A growing concern. European Heart Journal, *46*(29), 2931–2932. https://doi.org/10.1093/eurheartj/ehae729
- Wölnerhanssen, B. K., Meyer-Gerspach, A. C., Arduini, A., D’Alessandro, A., Gronda, E., Carugo, S., Bonomini, M., Gallieni, M., Masola, V., Angelillo-Scherrer, A., Prosdocimi, T., & Lopaschuk, G. D. (2025). Sweeteners: Erythritol, xylitol and cardiovascular risk—friend or foe? Cardiovascular Research, *121*(9), 1319–1329. https://doi.org/10.1093/cvr/cvaf091
- Medscape. (2026, September 7). Xylitol linked to increased long-term cardiovascular risk. https://www.medscape.com/viewarticle/xylitol-linked-increased-long-term-cardiovascular-risk-2026a1000x7i
Disclaimer:
This article is for educational purposes and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your physician before making health decisions based on the TyG Index or other biomarkers.
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