Major sugar substitute found to impair brain blood vessel cell function

Summary

Credit: Pixabay/CC0 Public Domain Erythritol may impair cellular functions essential to maintaining brain blood vessel health, according to researchers at the University of Colorado Boulder. Findings suggest that erythritol increases oxidative stress, disrupts nitric oxide signaling, raises vasoconstrictive peptide production, and diminishes clot-dissolving capacity in human brain microvascular endothelial cells. Erythritol has become a fixture in the ingredient lists of protein bars, low-calorie beverages, and diabetic-friendly baked goods. Its appeal lies in its sweetness-to-calorie ratio, roughly 60–80% as sweet as sucrose with a tiny fraction of the energy yield, and its negligible effect on blood glucose. Erythritol is also synthesized endogenously from glucose and fructose via the pentose phosphate pathway, leaving baseline levels subject to both dietary and metabolic influences. Concerns about erythritol's safety have escalated following epidemiological studies linking higher plasma concentrations with increased cardiovascular and cerebrovascular events. Positive associations between circulating erythritol and incidence of heart attack and stroke have been observed in U.S. and European cohorts, independent of known cardiometabolic risk factors. A causal mechanism for the link has remained elusive. In the study, "The Non-Nutritive Sweetener Erythritol Adversely Affects Brain Microvascular Endothelial Cell Function," published in the Journal of Applied Physiology, researchers designed in vitro experiments to test the cellular consequences of erythritol exposure on cerebral endothelial function. Human cerebral microvascular endothelial cells were cultured and exposed to an amount of erythritol equivalent to consuming a typical beverage. Experimental conditions included five biological replicates per group. Cellular assays measured oxidative stress, antioxidant protein expression, nitric oxide bioavailability, endothelin production, and fibrinolytic capacity. Cap...