Why Scientists Are Now Warning Us About This Popular Low-Calorie Sweetener
For a long time, I wholeheartedly believed that I was making the right decision every time I took a sugar-free snack. My uncle had taken advice from a doctor to lower blood sugar after a worrying blood pressure test, and he swapped almost everything — his teas, protein bars, keto-friendly cookies — with erythritol sweet products. He was proud of the change. We were all there. It seemed to be a clean, scientifically based solution to a real problem. Then, about two years later, he had a minor heart attack that caused us to lose control. His doctors could not pinpoint a single cause. But for several weeks after that, I read as much research I had done on the erythritol side effects — and what I found was very disturbing.
The science about this sweetener has changed in a way that most people don’t know about yet. A number of peer-reviewed studies published between 2023 and 2026 now raise serious questions about what this widely consumed sugar alcohol is doing to our bodies, especially our hearts and brains. If you are using Erithritol daily and think it is completely harmless, then this article is for you.
Table of Contents
What Is Erythritol — And Why Did We All Start Using It?
The Sugar Alcohol That Seemed Too Good to Be True
Erythritol is a sugar alcohol, a class of low-calorie sweeteners that also includes xylitol and sorbitol. It is produced commercially by fermenting glucose — typically from corn — and has been approved by the FDA since 2001. It contains almost no calories, registers at roughly 80% of the sweetness of table sugar, and — crucially — does not cause the blood glucose or insulin spike that ordinary sugar does.
That last point made it a darling of the keto movement, a staple in diabetic-friendly products, and a near-ubiquitous ingredient in sugar-free snacks, protein bars, low-calorie ice cream, and energy drinks. It was positioned as essentially nature’s gift — after all, small amounts of erythritol occur naturally in grapes, pears, and melons.
What the packaging never mentioned, however, was this: when erythritol is added to food as a sweetener, the resulting levels in your bloodstream are not like nibbling a grape. According to NIH-funded research, erythritol consumed from sweetened products creates blood levels more than 1,000 times higher than what your body would ever encounter from natural food sources. That is a fundamentally different exposure — and it changes the risk picture entirely.
Why It Is Hidden in Plain Sight
One of the most frustrating things I discovered in my research was just how invisible erythritol is on nutrition labels. In the UK and US, manufacturers are not required to list sugar alcohols individually. They are bundled under “sugar alcohols” in the ingredients, which most people skip straight past. My uncle had no idea how much he was consuming each day across multiple products.
This is the same issue I have written about before — when it comes to ultra-processed foods to always avoid, the real dangers are often buried in ingredient lists under names that sound innocuous. Erythritol is no different.
The Science That Raised the Red Flag
The 2023 Nature Medicine Study — What the Cleveland Clinic Found
The study that started the serious scientific conversation was published in Nature Medicine in February 2023. Researchers at the Cleveland Clinic, led by Dr. Stanley Hazen, ran one of the most comprehensive investigations into erythritol and cardiovascular health to date.
In an initial cohort of over 1,000 patients undergoing cardiac risk assessment, the team found that elevated blood levels of erythritol were strongly associated with major adverse cardiovascular events over a three-year follow-up period. They then validated these findings in two independent cohorts — one in the US (2,149 patients) and one in Europe (833 patients).
The numbers were striking. People in the highest erythritol quartile faced roughly 80 to 120% higher risk of heart attack, stroke, or death compared to those with the lowest levels — even after adjusting for age, blood pressure, diabetes, and other known risk factors.
📊 What the Cleveland Clinic Study Found
Study: Nature Medicine, February 2023 | Lead Researcher: Dr. Stanley Hazen, Cleveland Clinic
Patients with the highest blood erythritol levels were approximately 80–120% more likely to experience a heart attack, stroke, or cardiac death within three years — after controlling for all other known risk factors. The findings were replicated in both US and European patient cohorts.
How Erythritol Triggers Blood Clotting
The Cleveland Clinic team did not stop at the observational data. They conducted lab experiments that revealed a troubling mechanism: erythritol enhances platelet aggregation — the process by which blood platelets clump together to form clots. In healthy circulation, clotting is a controlled response. When erythritol accelerates that process, the risk of dangerous clots in arteries rises.
In a separate intervention study, 8 healthy adults were given a drink containing 30 grams of erythritol — the amount found in a typical sweetened beverage. Their blood plasma erythritol levels spiked dramatically and remained elevated for days after a single serving. Platelet reactivity increased in parallel. This was not a theoretical concern — it was a same-day biological response in real people.
The 2025 University of Colorado Brain Study
If the Cleveland Clinic findings were the first alarm, the 2025 University of Colorado Boulder study published in the Journal of Applied Physiology was the second. Researchers exposed human brain blood vessel cells — specifically, cerebral microvascular endothelial cells — to erythritol at concentrations equivalent to drinking just one sweetened beverage.
The results showed three separate damaging effects. First, the cells experienced significantly increased oxidative stress — the kind of cellular damage linked to ageing and disease. Second, they produced less nitric oxide, a critical compound that tells blood vessels to relax and dilate. Without adequate nitric oxide, blood vessels tighten, blood pressure rises, and clot risk increases. Third, erythritol impaired the brain cells’ ability to break down blood clots that had already formed.
“Our study adds to the evidence suggesting that non-nutritive sweeteners that have generally been purported to be safe, may not come without negative health consequences,” said senior author Professor Christopher DeSouza. I sat with that sentence for a long time after I read it. My uncle’s daily erythritol drink was providing precisely the dose used in that study.
🧠 What Happened to Brain Blood Vessel Cells
Study: Journal of Applied Physiology, June 2025 | University of Colorado Boulder
Exposure to erythritol at levels from one typical beverage serving caused: ↑ oxidative stress, ↓ nitric oxide production, ↓ ability to break down blood clots. All three effects contribute to increased stroke and heart attack risk.
Who Is Most at Risk from Erythritol Side Effects?
People with Pre-Existing Cardiovascular Risk
The original Cleveland Clinic cohort was drawn from patients already undergoing cardiac risk assessment — people with high blood pressure, high cholesterol, diabetes, or family history of heart disease. These are the very people most likely to have been told to swap sugar for a “healthier” alternative. My uncle fit this profile exactly.
The cruel paradox at the heart of erythritol’s story is that the population most aggressively marketed to is the population the research suggests should be most cautious. Erythritol does not raise blood sugar, which is why diabetics and people with metabolic conditions reached for it. But these groups already carry elevated cardiovascular risk — and the research suggests erythritol may compound that risk.
Heart health is something I think about a lot, particularly after following the evidence on what pomegranate juice does for cholesterol and cardiovascular health. The contrast is instructive — natural, whole-food compounds working to protect blood vessel health versus a heavily processed sweetener that may undermine it.
The Keto and Diabetic Community
The keto diet and diabetic-friendly food industry are the two biggest markets for erythritol-sweetened products. Browse the ingredients of almost any keto protein bar, sugar-free chocolate, low-carb biscuit, or diabetic dessert mix in a UK supermarket and erythritol is likely in the top four ingredients.
Many people in these communities have spent years carefully managing their health. The idea that a product they were told was safe — and which genuinely does not spike blood glucose — might be quietly increasing their clotting risk and stressing their brain blood vessels is difficult to absorb. But it is where the evidence is pointing.
People Who Do Not Know They Are Consuming It
The hidden nature of erythritol on labels means that many people consuming it daily have no idea it is even in their diet. It is listed under “sugar alcohols,” a category that most shoppers treat as synonymous with “safe.” This is the kind of label blindspot that makes the difference between informed choice and accidental overconsumption.
What the Science Does Not Yet Prove — And Why That Still Matters
The Honest Limitations of Current Research
I want to be clear about something important: the current research shows association, not definitive proof of causation. The 2023 Nature Medicine study was observational — it tracked people over time but did not randomly assign them to consume erythritol. It is scientifically possible that people who already had poor cardiovascular health happened to consume more erythritol-sweetened products, rather than erythritol causing that health decline.
Some researchers have also noted that elevated plasma erythritol might be a marker of metabolic dysfunction rather than a cause — the body itself produces small amounts of erythritol as a byproduct of normal glucose metabolism, and that production increases in people with metabolic stress.
⚠️ Science Note: What We Know and What We Don’t
Current studies show a strong association between erythritol and cardiovascular risk, backed by clear biological mechanisms (platelet activation, reduced nitric oxide, oxidative stress). However, causation has not been definitively proven. Researchers broadly agree that caution around daily high-dose consumption is warranted while further study is underway.
What Researchers Are Actively Calling For Right Now
Despite the limitations, the scientific community is not dismissing the concern. The University of Colorado team explicitly stated it would be “prudent for people to monitor their consumption” of erythritol. A clinical trial launched in 2025 by the University of California, Davis is now directly studying erythritol’s effects on platelet reactivity and vascular inflammation in human participants — not just cells in a lab.
The Cleveland Clinic team has continued publishing follow-up research through 2025, each study reinforcing the cardiovascular signal. A 2025 review in Cardiovascular Research also flagged erythritol and xylitol for further regulatory scrutiny. The scientific direction of travel is clear, even if the final verdict has not been written.
My Uncle’s Kitchen and What Changed After My Research
After spending several evenings going through these studies, I sat down with my uncle and showed him what I had found. Not in a dramatic, alarming way — but plainly, the way you would tell someone you care about that the safe-sounding thing in their kitchen may not be as safe as the packet claims.
He had five different erythritol-sweetened products in his kitchen. Keto protein bars. A bag of erythritol granules he used to sweeten his chai. Sugar-free chocolate. Low-calorie yoghurt. A box of protein powder. He had been consuming erythritol multiple times a day, every day, for over two years. He was consuming it precisely because he was trying to protect his heart.
The conversation was not easy. Changing a habit you built on health grounds feels counterintuitive. But he made gradual changes. He replaced the erythritol granules with a small amount of raw honey in his tea. He started checking labels more carefully on packaged snacks. He did not overhaul everything overnight — but he became intentional about what he was putting into his body and at what quantity.
That shift — from passive consumption of “healthy-labelled” products to active, informed label-reading — is something I have written about in the context of ultra-processed foods and the hidden ingredients that accumulate over time. The principle applies directly here.
Practical Steps to Reduce Your Erythritol Exposure
Start With a Label Audit
Go through your kitchen and check the ingredients of protein bars, keto snacks, sugar-free drinks, low-calorie ice cream, protein powders, and any product labelled “sugar-free” or “diabetic-friendly.” Look for erythritol explicitly, or look for “sugar alcohols” in the nutritional information — erythritol is the most common one in these product categories.
Pay particular attention to products where erythritol appears in the top three or four ingredients. The higher up the list, the larger the proportion in the product — and the more your daily intake accumulates across multiple servings.
Natural Sweetener Alternatives Worth Considering
If you are trying to reduce sugar, there are alternatives with fewer red flags in the current evidence base:
- Raw honey (in small amounts): retains antioxidants and has been associated with some anti-inflammatory properties in research.
- Pure maple syrup (sparingly): lower glycaemic impact than refined sugar, with trace minerals.
- Medjool dates (whole food): the fibre slows glucose absorption, making them a better option than concentrated sweeteners for most people.
- Monk fruit extract: currently has fewer cardiovascular concerns in the research literature, though long-term human data remains limited.
None of these are calorie-free, and none are a licence to overconsume. The goal is not to find a perfect sugar replacement — it is to be honest about trade-offs and choose with full information.
The Bigger Picture — Rethinking What “Healthy” Really Means on a Label
The erythritol story is a good example of why I am cautious about any product that leads with health claims on the front of the packet. “Zero calories,” “keto-friendly,” “diabetic-safe” — these phrases are not lies, but they are partial truths. They address one concern while potentially introducing another.
I have written before about how the gut microbiome responds to what we eat — and whole, minimally processed foods consistently come out ahead of refined and engineered alternatives. Erythritol is ultimately an industrial product built to mimic one property of sugar while sidestepping another. The research is beginning to reveal what it does not sidestep.
The wellness lesson I keep coming back to, whether writing about nutrition, weight management, or cardiovascular health, is that no engineered shortcut exists without its own set of consequences. The body is not fooled for long.
Conclusion
When I first started researching the side effects of erythritol, I expected to get the usual message, subtle but satisfying: “Some concerns, more research is needed, in moderation may be okay.” Instead, I found a growing body of evidence — from the Cleveland Clinic, the University of Colorado Boulder, and peer-reviewed journals in 2023, 2025 and 2026 — that tells a more serious story.
This is not an invitation to panic. It’s a call to get information. My uncle is not the only person who turned to Erithritol in an attempt to do the right thing for his health. Millions of people in the UK and beyond are in the same situation. They have a right to know what current science says — not just the food industry’s marketing that tells them.
If you consume erythritol regularly, especially in multiple products daily, consider reducing your intake while the research continues to develop. Check labels. Choose whole-food sweetener alternatives where you can. And if you have any cardiovascular risk factors, have that conversation with your GP. The information is out there now — and understanding what your gut and body need from real food is always going to serve you better than trusting a “sugar-free” label at face value.
Frequently Asked Questions
What are the main erythritol side effects?
Research has linked erythritol to increased platelet aggregation (raising blood clot risk), reduced nitric oxide production in brain blood vessels (impairing normal blood flow), and higher oxidative stress in cerebral cells. A major 2023 Cleveland Clinic study also associated high blood erythritol levels with nearly double the risk of heart attack or stroke in at-risk patients.
Is erythritol safe to use every day?
While erythritol is FDA-approved, daily high-dose consumption is now under scrutiny. Multiple studies from 2023 to 2026 show cardiovascular and vascular concerns. Current scientific guidance recommends monitoring and moderating intake, particularly for those with pre-existing cardiovascular risk factors.
Why might erythritol be bad for your heart?
Erythritol appears to enhance platelet clumping, which raises clot formation risk. It also reduces nitric oxide — the compound blood vessels use to dilate — and may impair clot breakdown in brain blood vessels. These three mechanisms together increase risk of heart attack and stroke.
Which sweeteners are considered safer than erythritol right now?
Based on current evidence, monk fruit extract has fewer cardiovascular concerns in the published research. Small amounts of raw honey or pure maple syrup are also commonly used alternatives. No sweetener is entirely risk-free — always use in moderation and consult your healthcare provider.
Does erythritol raise blood sugar?
No — erythritol does not significantly raise blood glucose or insulin. This glucose-safe profile made it popular among diabetics and keto dieters. However, the emerging cardiovascular research shows that not spiking blood sugar does not make erythritol without risk — the two concerns are separate.
⚕️ Medical Disclaimer:
This article is for informational purposes only and does not constitute medical advice. Always consult your GP or a qualified healthcare professional before making changes to your diet, especially if you have a cardiovascular condition, diabetes, or any chronic health issue.
