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Artificial sweeteners have long held a reputation as safer, low-calorie stand-ins for sugar: they’re labeled diabetes-friendly and even touted for dental health. Among them, Stevia and Erythritol are frequently paired in countless “sugar-free” products found on the market. However, a recent laboratory study has cast doubt on erythritol’s risk profile, suggesting a possible link to changes in the brain’s vascular system associated with stroke.
What Did the Study Find?
Researchers conducted the study in vitro—that is, outside the human body—using cultured human brain microvascular endothelial cells (the same cells lining blood vessels in the brain, crucial for controlling blood flow and clotting). These cells were exposed to erythritol amounts comparable to what you might find in a typical artificially sweetened beverage (roughly 30g).
The investigation centered on how erythritol affects:
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Oxidative stress (damage caused by unstable molecules called reactive oxygen species or ROS)
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Production of nitric oxide (NO) (a critical molecule for relaxing blood vessels)
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Markers influencing blood clotting and vessel function
Key Results: Higher Oxidative Stress and Disrupted Blood Flow
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Oxidative stress levels doubled in the erythritol-treated cells compared to untreated ones. Cells responded by producing more antioxidant proteins—like superoxide dismutase-1 and catalase—to try and counter the damage. But scientists warn that this “oxidative imbalance” may overwhelm cellular defenses, potentially weakening the blood-brain barrier and heightening the risk of neurovascular conditions, including stroke.
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Decreased nitric oxide (NO) production was another big concern. While the enzyme responsible for making NO (eNOS) itself did not change, its active and inactive forms were altered: the active form decreased, while the inhibitory form increased. This disruption could mean stiffer blood vessels, a higher likelihood of clot formation, and ultimately, a raised risk for ischemic stroke.
The Takeaway
While stevia alone has not been directly implicated, its frequent use with erythritol in many commercial “sugar-free” products means consumers may be getting a dose of both. The study raises important questions about the neurological safety of these sweetener blends, especially when consumed regularly.
Disclaimer:
This study was conducted in laboratory cell cultures, not in live animals or humans. The findings suggest possible mechanisms by which erythritol could affect the brain’s blood vessels, but more research—including clinical studies in people—is needed before definitive conclusions can be drawn. The results do not mean that consuming erythritol or stevia causes strokes in people. Always consult a medical professional before making changes to your diet or health routine.
