Popular Sugar Substitute Erythritol Linked to Brain Damage and Stroke Risk in New Study

A widely used sugar substitute found in everything from keto snacks to diet drinks may pose serious health risks, according to new research from the University of Colorado Boulder. Scientists discovered that erythritol can disrupt brain blood vessel cells, reducing their ability to relax, increasing harmful oxidative stress, and impairing the body's natural ability to break down blood clots. These cellular changes create conditions that could significantly raise stroke risk, even at typical consumption levels found in everyday sugar-free products.

Erythritol gained FDA approval in 2001 and has since become a staple ingredient in hundreds of food products targeting health-conscious consumers. The sugar alcohol, typically made by fermenting corn, contains almost no calories while delivering about 80 percent of the sweetness of regular sugar with minimal impact on insulin levels. These properties have made it particularly popular among people following ketogenic diets, managing diabetes, or seeking to reduce their overall carbohydrate intake without sacrificing sweetness in their foods.

The new study, published in the Journal of Applied Physiology, exposed human brain blood vessel cells to erythritol concentrations similar to those found in a typical sugar-free beverage for three hours. The results revealed several concerning changes at the cellular level. Treated cells produced significantly less nitric oxide, a crucial compound that helps blood vessels relax and widen to maintain healthy blood flow. Simultaneously, the cells generated more endothelin-1, a substance that causes blood vessels to constrict and potentially restrict circulation.

Perhaps most troubling, the research found that erythritol-exposed cells had reduced ability to produce tissue plasminogen activator (t-PA) when exposed to thrombin, a blood-clotting substance. This compound serves as the body's natural mechanism for breaking down dangerous blood clots that can cause strokes and heart attacks. The treated cells also generated higher levels of reactive oxygen species, commonly known as free radicals, which can damage cellular structures, accelerate aging processes, and trigger inflammatory responses throughout the cardiovascular system.

The findings add to growing concerns about erythritol's safety profile following a large-scale study of 4,000 people in the United States and Europe that found individuals with higher blood levels of erythritol were significantly more likely to experience heart attacks or strokes within three years. Senior author Christopher DeSouza emphasized that their study used only single serving amounts of erythritol, suggesting people who consume multiple servings daily could face even greater health risks. The researchers stress that while their findings come from laboratory cell studies rather than human trials, the results provide a clear biological mechanism explaining how this popular sweetener could contribute to cardiovascular disease.