Scientists discover a hidden problem with this popular sugar substitute

Recent research published in Science Signaling has unveiled a hidden risk associated with a popular sugar substitute, sorbitol. Sorbitol, commonly found in low-calorie candy and chewing gum, may pose metabolic dangers that were previously underestimated. The study, led by Gary Patti's laboratory at Washington University in St. Louis, explores how sorbitol affects the liver and other body parts.

Patti, a renowned chemist, has previously investigated the detrimental effects of fructose on the liver. This new study reveals that sorbitol, essentially one transformation away from fructose, may produce similar harmful effects. The researchers conducted experiments on zebrafish to trace sorbitol's journey within the body. Sorbitol can be produced in the intestine from glucose after a meal, and its fate depends on glucose intake, sorbitol levels, and gut bacteria.

Surprisingly, sorbitol production is not exclusive to diabetic conditions. Under healthy circumstances, high gut glucose levels after eating can trigger significant sorbitol production. Certain bacteria in the gut, known as Aeromonas, can break down sorbitol into harmless byproducts, preventing it from reaching the liver. However, if the gut lacks these beneficial bacteria, sorbitol accumulates in the liver, potentially leading to metabolic issues.

The implications of this research are significant for individuals who opt for sugar-free products, believing them to be healthier alternatives. Sorbitol, like other sugar alcohols, is often marketed as a better choice than refined sugar. However, this study suggests that sorbitol may not pass through the body unscathed, especially when consumed in large quantities.

The findings highlight the complexity of metabolic consequences associated with alternative sweeteners, making it challenging to determine which sugar substitutes are genuinely healthier.