A common sugar substitute has been shown to impair the cells that form the brain\u2019s protective barrier. <\/p>\n\n\n\n
By disrupting how those cells regulate blood flow and dissolve clots, the sweetener introduces a direct biological link to stroke risk that consumers rarely consider.<\/p>\n\n\n\n
Inside the delicate lining of the brain\u2019s smallest blood vessels, erythritol exposure altered the behavior of the very cells that guard neural tissue. <\/p>\n\n\n\n
Working with cultured human brain<\/a> microvascular endothelial cells, Professor Christopher A. DeSouza at the University of Colorado Boulder (CU Bolder) documented clear signs of dysfunction after short-term exposure to amounts comparable to a single sweetened drink.\u00a0<\/p>\n\n\n\n Rather than maintaining balanced vessel signaling, the treated cells shifted toward a state associated with constriction and reduced protective capacity. <\/p>\n\n\n\n Those early cellular changes do not prove harm in living people, but they establish a focused biological pathway that demands closer scrutiny.<\/p>\n\n\n\n These brain vessel cells form much of the blood-brain barrier, a filter that controls what reaches brain tissue.<\/p>\n\n\n\n Tight connections between endothelial cells, the lining cells inside blood vessels, help stop toxins and germs from leaking through.<\/p>\n\n\n\n Damage to that lining can also disturb how blood moves, since the same cells control vessel relaxation and constriction.<\/p>\n\n\n\n When those controls fail in the brain, even a small clot can cut off oxygen fast and raise stroke danger.<\/p>\n\n\n\n In the lab, erythritol pushed cells into oxidative stress, a buildup of reactive chemicals that harm cells.<\/p>\n\n\n\n That reaction increased free radicals, highly reactive molecules that damage proteins and membranes, while the cells scrambled to boost defenses.<\/p>\n\n\n\n Reactive oxygen production rose to about double the untreated level, at a dose designed to mimic a single sweetened drink.<\/p>\n\n\n\n Cells under that chemical pressure cannot keep their barriers tight, which could make brain vessels more fragile over time.<\/p>\n\n\n\n One of the clearest changes involved nitric oxide, a gas signal that relaxes blood vessels and supports steady flow.<\/p>\n\n\n\n Erythritol exposure led the cells to release less nitric oxide, so vessel walls would stay tighter during demand swings.<\/p>\n\n\n\n At the same time, endothelin-1, a signal that tightens blood vessels, rose by about 30% in treated cells.<\/p>\n\n\n\n With the relaxing signal down and the tightening signal up, brain microvessels could constrict when they should dilate.<\/p>\n\n\n\n Another warning appeared when the cells met a clotting signal that normally starts a cleanup response.<\/p>\n\n\n\n Healthy vessels release tissue plasminogen activator, a protein that helps dissolve blood clots, before a blockage grows dangerous.<\/p>\n\n\n\n After erythritol exposure, that clot-dissolving burst barely rose, while untreated cells increased release by about 25%.<\/p>\n\n\n\n Such blunted release could leave more clots intact in narrow brain vessels, raising ischemic stroke, a clot that blocks blood flow in the brain.<\/p>\n\n\n\n Lab results matter more when they match patterns in real people, and erythritol already sits in that category.<\/p>\n\n\n\n “Erythritol, a common non-nutritive sweetener, is associated with increased risk of cardiovascular and cerebrovascular events,” wrote DeSouza.<\/p>\n\n\n\n In a large analysis<\/a>, the top quarter for blood erythritol faced about double the 3-year event risk. Those studies cannot prove erythritol caused the harm, yet they make the lab damage harder to dismiss.<\/p>\n\n\n\n Manufacturers use erythritol because it tastes close to sugar and does not spike blood glucose for most people.<\/p>\n\n\n\n As a sugar alcohol, a carbohydrate that tastes sweet but digests differently, it passes through the body with little energy.<\/p>\n\n\n\n In a 2023 World Health Organization guideline<\/a>, the advice covered non-sugar sweeteners, but it excluded sugar alcohols like erythritol.<\/p>\n\n\n\n That exclusion helped the sweetener keep a healthy image, even as scientists kept looking for hidden downsides.<\/p>\n\n\n\n Across the United States, the Food and Drug Administration, FDA<\/a>, has allowed erythritol in foods and beverages.<\/p>\n\n\n\n In one FDA response letter<\/a>, the agency accepted a company’s conclusion that erythritol is safe for intended uses.<\/p>\n\n\n\n FDA reviews focus on toxicology and exposure estimates, so they rarely test how a single ingredient affects a specific tissue.<\/p>\n\n\n\n Labels like “sugar-free<\/a>” and “keto-friendly” can make erythritol feel like a sure bet, even when evidence gets complicated.<\/p>\n\n\n\n Cell-dish experiments can reveal early damage, but they cannot capture digestion, hormones, and repair systems working in a living body.<\/p>\n\n\n\n To bridge that gap, scientists are building models like organ-on-a-chip, tiny devices that mimic blood vessels under flow.<\/p>\n\n\n\n At CU Boulder, DeSouza called for longer testing and more realistic flow, since brain vessels respond to constant pressure changes.<\/p>\n\n\n\n Until those studies report, the current findings mark a plausible mechanism rather than a verdict on every can.<\/p>\n\n\n\n The findings link a common sugar substitute to weaker brain vessel defenses and less control over blood flow and clots.<\/p>\n\n\n\n People who lean on keto or diabetic-friendly products may want to scan ingredients, and scientists will need better real-world exposure studies.<\/p>\n\n\n\n The study is published in the Journal of Applied Physiology<\/em><\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":" A common sugar substitute has been shown to impair the cells that form the brain\u2019s protective barrier. By disrupting how … <\/p>\nRead More: For years they were believed to be the last mammoth bones, until scientists discovered they were whales found 400 kilometers from the coast<\/a><\/h3>\n<\/div>\n<\/div><\/div>\n<\/div>\n\n\n\n
Barrier cells under strain<\/h2>\n\n\n\n
A chemical stress surge<\/h2>\n\n\n\n
Signals steer blood flow<\/h2>\n\n\n\n
When clots persist longer<\/h2>\n\n\n\n
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Human data raises alarms<\/h2>\n\n\n\n
Why industry picked erythritol<\/h2>\n\n\n\n
What regulators have said<\/h2>\n\n\n\n
Next tests that matter<\/h2>\n\n\n\n
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What changes now<\/h2>\n\n\n\n