This report details new research from the University of Colorado Boulder linking the popular sugar substitute erythritol to potential adverse effects on brain blood vessel health. Historically used as a low-calorie, non-glycemic sweetener, recent epidemiological studies have raised concerns about its association with increased cardiovascular and cerebrovascular events. The new in vitro study, published in the Journal of Applied Physiology, demonstrates that erythritol exposure can impair human brain microvascular endothelial cell function by increasing oxidative stress, disrupting nitric oxide signaling, raising vasoconstrictive peptide production, and diminishing clot-dissolving capacity. These cellular findings provide a potential causal mechanism for the observed links to stroke risk. The report also provides general information about erythritol's properties, absorption, regulatory status, and other biological effects, including its laxative potential at high doses and its surprising insecticide properties in fruit flies.
Erythritol: New Research on Brain Blood Vessel Health and General Properties
Erythritol's Popularity and Growing Concerns: Erythritol is a widely used sugar substitute in low-calorie and diabetic-friendly foods, valued for being 60-80% as sweet as sucrose with minimal calories and no effect on blood glucose. However, epidemiological studies have increasingly linked higher circulating erythritol levels to an increased incidence of heart attack and stroke, independent of other cardiometabolic risk factors.
New Study on Brain Microvascular Endothelial Function: Researchers at the University of Colorado Boulder conducted in vitro experiments, published in the Journal of Applied Physiology, to investigate the cellular consequences of erythritol exposure on human cerebral microvascular endothelial cells.
Increased Oxidative Stress: Cells exposed to erythritol showed a significant increase (approximately 75%) in reactive oxygen species, along with elevated antioxidant defense markers (SOD-1 by 45%, catalase by 25%).
Disrupted Nitric Oxide Signaling: Nitric oxide production decreased by nearly 20%. While total eNOS expression remained stable, its activation (phosphorylation at Ser1177) fell by approximately 33%, and inhibitory phosphorylation rose by approximately 39%. Nitric oxide is crucial for maintaining healthy blood vessel dilation.
Diminished Clot-Dissolving Capacity: Erythritol-treated cells exhibited blunted tissue-type plasminogen activator (t-PA) release in response to stimulation, indicating a reduced ability to dissolve blood clots.
Raised Vasoconstrictive Peptides: The study also found an increase in the production of endothelin-1 (ET-1), a peptide that causes blood vessel constriction.
Key Takeaway: These findings suggest that erythritol disrupts multiple vital mechanisms essential for cerebral endothelial health, providing a cellular basis that aligns with prior epidemiological associations linking it to elevated stroke risk.
Recommendations for Future Research: The authors emphasize the need for further long-term and in vivo studies, including clinical trials, to clarify the cerebrovascular consequences of repeated dietary exposure to erythritol.
General Properties and Safety (from Wikipedia):
Definition & Production: Erythritol is a naturally occurring sugar alcohol, produced commercially from corn starch via enzymatic hydrolysis and fermentation.
Caloric Value & Blood Glucose: It is nearly non-caloric (0.2 cal/gram in the US, zero-calorie in EU/Japan) and does not affect blood sugar or insulin levels (Glycemic Index 0%, Insulin Index 2%), making it suitable for people with type 2 diabetes.
Absorption & Digestion: 80-90% of an oral dose is rapidly absorbed in the small intestine and excreted unchanged in urine. The remaining ~10% enters the colon and is not digested by intestinal bacteria, minimizing typical sugar alcohol digestive issues in small doses.
Laxative Effect: While generally well-tolerated, large doses (e.g., >50 grams or >0.66-0.8 g/kg body weight) can cause nausea, stomach rumbling, watery feces, or diarrhea. In 2023, the European Food Safety Authority (EFSA) lowered its recommended daily intake limit to 0.5 grams per kg body weight due to concerns about laxative effects and potential electrolyte imbalance from prolonged exposure. In the US, it remains generally recognized as safe (GRAS).
Oral Health: Erythritol is tooth-friendly as it is not metabolized by oral bacteria and can even have antibacterial effects against streptococci, helping to reduce dental plaque and decay.
Other Biological Effects:
Insecticide: Erythritol has been observed to function as an insecticide, toxic to fruit flies (Drosophila melanogaster), impairing their motor ability and reducing longevity.
Bacterial Growth: It is preferentially used by Brucella spp. bacteria, which may explain their accumulation in the placentas of infected animals.