Does Erythritol Cause Strokes? What the Research Actually Says
The alarming headline goes further than the evidence. Human, laboratory and genetic studies have raised legitimate questions about erythritol and clotting—but no long-term randomized trial has shown that eating erythritol causes strokes.
No—the research does not prove that erythritol causes strokes.
It does, however, give scientists several reasons to keep investigating the sweetener more aggressively.
The newest headlines trace largely to a 2025 laboratory study that exposed human brain microvascular endothelial cells—the cells lining tiny blood vessels in the brain—to erythritol. Researchers observed more oxidative stress, lower nitric-oxide production, higher endothelin-1 and a weaker release of tissue-type plasminogen activator (t-PA), a protein involved in breaking down clots.[1]
Those findings matter because all four changes point in a direction that could make blood vessels less protective against ischemic stroke. But the experiment was conducted on cultured cells. No participants ate erythritol and then suffered strokes in this study.
The evidence now spans observational cohorts, a very small human intervention, cell experiments and genetic analyses. That is more than a random scare—but still less than proof of long-term clinical harm from dietary erythritol.
Your current U.S. Google Trends export shows both “erythritol” and “erythritol stroke risk research” as breakout searches, which is why this older paper is suddenly receiving a fresh wave of attention.
A 2025 paper is getting a second life.
The University of Colorado Boulder study was published in the Journal of Applied Physiology in 2025, but it has resurfaced in 2026 health coverage and social discussion. That timing matters: readers may reasonably assume a headline appearing today describes a brand-new human trial. It does not.
This distinction is not word games. A mechanistic cell study answers a different question from a randomized clinical trial. It can show how harm might happen. It cannot tell us how often that harm actually occurs in people eating ordinary diets.
What is erythritol?
Erythritol is a sugar alcohol, or polyol. It occurs naturally in small amounts in some foods and can also be manufactured for use as a sweetener. It is common in sugar-free, reduced-sugar, low-carbohydrate and keto-oriented products.
Unlike table sugar, erythritol has little effect on blood glucose. That is one reason it became attractive to people trying to reduce sugar or carbohydrate intake. The FDA permits sugar alcohols including erythritol for use as sugar substitutes in foods.[4]
There is another complication that becomes very important when interpreting blood studies: the human body can make erythritol too. Research has shown endogenous erythritol production through the pentose-phosphate pathway, meaning a high blood level does not automatically tell researchers how much sweetener someone ate.[6]
Chemical structure of erythritol · Su-no-G / Wikimedia Commons · public domain.
Four kinds of evidence—and four different questions.
The strongest way to understand the erythritol debate is to stop treating every study as interchangeable. Observational research can detect associations. Intervention studies can test short-term biological effects. Laboratory studies can probe mechanisms. Genetic studies can attempt causal inference under specific assumptions.
Higher blood erythritol tracked with more cardiovascular events
A Nature Medicine study analyzed several cohorts of people undergoing cardiac evaluation. Participants with higher circulating erythritol had higher rates of major adverse cardiovascular events—including heart attack, stroke or death—over three years. Comparing the highest with lowest erythritol quartiles, adjusted hazard ratios were about 1.8 in the U.S. validation cohort and 2.2 in the European cohort.[2]
What it adds: A substantial association worth investigating.
What it cannot prove: That dietary erythritol caused the events. Blood erythritol can also reflect endogenous metabolism.
Thirty grams acutely increased platelet reactivity
Researchers gave 10 healthy volunteers 30 grams of erythritol and another 10 volunteers 30 grams of glucose. Thirty minutes after erythritol, plasma levels rose sharply and platelet responses became more reactive across the measures tested. Glucose did not produce the same response.[3]
What it adds: Direct human evidence of a short-term clotting-related biological effect.
What it cannot prove: Long-term stroke incidence. The study was tiny, short and measured platelet behavior—not cardiovascular events.
Brain-vessel cells showed a less protective profile
Human brain microvascular endothelial cells exposed to erythritol showed more oxidative stress, lower nitric-oxide production, higher endothelin-1 and a blunted t-PA response.[1]
What it adds: A plausible pathway connecting erythritol exposure with blood-vessel and clotting biology relevant to ischemic stroke.
What it cannot prove: That a person eating erythritol will experience the same effect throughout the body or suffer a stroke.
Genetic analyses have not all agreed
A 2024 Mendelian-randomization analysis did not find supportive evidence that higher erythritol increased coronary artery disease.[7] Later analyses reported positive genetic associations with coronary heart disease and ischemic stroke.[8]
What it adds: Another way to test whether the association might be causal rather than simple confounding.
What it cannot settle: The question by itself. Mendelian randomization depends on the validity of the genetic instruments and assumptions used.
Diabetes may explain part of the signal
In a nested case-control analysis from the Nurses' Health Study, higher plasma erythritol was associated with coronary heart disease after several adjustments. But the erythritol association was no longer statistically significant after diabetes was added to the model.[9]
Why that matters: It supports the possibility that elevated erythritol can sometimes be a marker of metabolic dysfunction rather than a simple record of sweetener intake.
FDA has not concluded that erythritol causes cardiovascular disease
The FDA says it reviewed the 2023 cardiovascular paper and concluded that the observational studies cited did not establish a causal link between consuming erythritol and the reported outcomes. It says it will continue monitoring new information.[4]
What it means: The scientific concern has not translated into an FDA finding that normal erythritol consumption causes stroke.
How could erythritol theoretically affect stroke risk?
The 2025 cell experiment points toward several processes that normally help tiny blood vessels regulate flow and manage clotting.
Put together, those changes create a biologically coherent concern: vessels that constrict more, relax less and release less clot-dissolving t-PA could theoretically become less resilient to a clot-related event.
But coherence is not the same thing as clinical proof. Human bodies regulate absorption, metabolism, kidney clearance, hormones, blood flow and dozens of interacting systems that a dish of cultured cells cannot reproduce.
What we still do not know.
There is a real scientific signal here. There is also a long list of unanswered questions.
“Allowed” does not mean “the science is finished.”
Regulatory status is useful context, but it should not be treated as a substitute for the evolving evidence.
The FDA permits sugar alcohols including erythritol and says the 2023 observational evidence did not establish a causal link between consumption and cardiovascular outcomes. The agency says it continues to monitor new information.[4]
EFSA's re-evaluation set an acceptable daily intake of 0.5 g/kg body weight per day. Importantly, that level was designed primarily around the immediate laxative effect and potential consequences of diarrhea—not around proving or disproving stroke risk.[5]
WHO's 2023 recommendation against using non-sugar sweeteners for weight control does not apply to sugar alcohols such as erythritol; WHO explicitly excluded polyols from that recommendation.[10]
Should you stop eating erythritol?
The evidence supports caution and attention—not panic.
There is not enough evidence to say that an occasional erythritol-sweetened food causes strokes. There is enough evidence to justify asking whether habitual high intake is wise, especially while researchers are still trying to determine whether the clotting signals seen in short-term studies translate into long-term disease.
Erythritol may appear on its own or inside products marketed as stevia, monk-fruit, keto or zero-sugar blends. The front label does not always tell you which sweetener provides the bulk.
A diet built around repeatedly replacing sweetness with another sweetener is different from occasionally eating a product that contains erythritol.
If you have cardiovascular disease, diabetes, kidney disease or another condition that changes clotting or vascular risk, discuss major dietary changes with a qualified clinician rather than treating a headline as personalized medical advice.
There is also a false choice worth avoiding: “If erythritol might have risks, regular sugar must be better.” That conclusion does not follow. Excess added sugar has its own well-established health costs. The better long-term strategy may be reducing how intensely sweet the overall diet needs to be rather than assuming every gram of sugar must be replaced one-for-one with another sweetener.
Erythritol and stroke risk FAQ
Does erythritol cause strokes?
Current research does not prove that dietary erythritol causes strokes in humans. Observational studies, a small human intervention and laboratory research have raised concerns about clotting and vascular mechanisms, but long-term randomized outcome trials are still missing.
Why are people talking about erythritol and stroke risk now?
A 2025 laboratory paper examining human brain-vessel cells has resurfaced in 2026 news coverage and social discussion. The paper found several changes that could theoretically make vessels less protective against ischemic stroke, but it did not measure strokes in people.
What did the 2025 erythritol study actually find?
Researchers reported increased oxidative stress, reduced nitric-oxide production, increased endothelin-1 and a weaker t-PA response in erythritol-treated human brain microvascular endothelial cells.
What did the human erythritol study find?
In a 2024 intervention involving 20 healthy volunteers, 10 people consumed 30 grams of erythritol and 10 consumed 30 grams of glucose. Platelet reactivity increased after erythritol but not glucose. The study measured a short-term biological response, not actual strokes.
Is erythritol banned by the FDA?
No. The FDA permits erythritol as a sugar alcohol sweetener. The agency says the 2023 observational research did not establish that consuming erythritol caused the observed cardiovascular outcomes and that it continues to review new information.
What is EFSA's acceptable daily intake for erythritol?
EFSA set an ADI of 0.5 grams per kilogram of body weight per day. That threshold was primarily based on preventing diarrhea and related effects, not on a demonstrated cardiovascular threshold.
Can your body make erythritol?
Yes. Humans can synthesize erythritol through glucose metabolism in the pentose-phosphate pathway. This is one reason researchers must be careful when interpreting high erythritol levels in blood.
The answer is not “safe” or “dangerous.” It is “not settled yet.”
Erythritol is no longer a sweetener that can be discussed as though cardiovascular safety has never been questioned. But the evidence also does not justify telling readers that it has been proven to cause strokes.
The responsible interpretation is narrower: several independent lines of research have identified associations and biological effects that deserve long-term human testing. Until those trials exist, certainty in either direction goes beyond the data.
Sources
- Berry AR, et al. The non-nutritive sweetener erythritol adversely affects brain microvascular endothelial cell function. Journal of Applied Physiology (2025).
- Witkowski M, et al. The artificial sweetener erythritol and cardiovascular event risk. Nature Medicine (2023).
- Witkowski M, et al. Ingestion of erythritol, but not glucose, enhances platelet reactivity and thrombosis potential in healthy volunteers. Arteriosclerosis, Thrombosis, and Vascular Biology (2024).
- U.S. Food and Drug Administration. Aspartame and Other Sweeteners in Food.
- European Food Safety Authority. Re-evaluation of erythritol (E 968) as a food additive.
- Mammalian metabolism of erythritol: a predictive biomarker of metabolic dysfunction.
- Khafagy R, et al. Erythritol as a Potential Causal Contributor to Cardiometabolic Disease: A Mendelian Randomization Study.
- Role of erythritol in coronary heart disease, ischemic stroke, and venous thromboembolism: A Mendelian randomization analysis (2025).
- Plasma levels of polyols erythritol, mannitol, and sorbitol and incident coronary heart disease among women (2024).
- World Health Organization. Guideline on non-sugar sweeteners (2023), including scope exclusions for sugar alcohols/polyols.
Medical disclaimer: This article is for general educational purposes and does not diagnose, treat or replace individualized advice from a qualified healthcare professional.
Image licensing: Erythritol crystal photograph by Thomas Kniess, Wikimedia Commons, CC BY-SA 4.0. Erythritol structural formula by Su-no-G, Wikimedia Commons, public domain.