New Study Links Common Sweeteners to Long-Term Metabolic Changes Across Generations

That "zero-calorie" sweetener in your drink might not be as metabolically neutral as it seems.

A new study published in Frontiers in Nutrition suggests that commonly used non-nutritive sweeteners like sucralose and stevia may influence metabolism in unexpected ways—potentially even across generations. While these sweeteners are widely used as sugar substitutes, concerns have been growing about their long-term health effects.

In this study, researchers from the Universidad de Chile tested the effects of these sweeteners in mice. The animals were given water containing either sucralose, stevia, or no sweetener, at doses comparable to typical human consumption. The researchers then tracked metabolic changes not only in the original mice but also in their offspring across two generations.

The results revealed subtle but notable changes. Mice exposed to sweeteners showed altered glucose tolerance—an early indicator of metabolic dysfunction. These effects varied by sex and type of sweetener, but were more consistent and long-lasting with sucralose.

The study also found disruptions in the gut microbiome. While microbial diversity increased, the production of beneficial compounds called short-chain fatty acids decreased. These compounds are important for gut health and metabolic regulation. Additionally, changes in gene expression linked to inflammation and metabolism were observed, suggesting possible epigenetic effects—biological changes that can be passed to future generations.

Interestingly, these changes did not lead to immediate disease, such as diabetes, but may represent early warning signs of metabolic imbalance. Researchers emphasize that the findings do not prove causation and may not directly translate to humans.

Still, the study raises important questions about how artificial sweeteners interact with the body over time. While not a cause for alarm, the researchers suggest moderation and further investigation into their long-term effects on human health.

REFERENCE: Concha Celume, F., et al. (2026). Artificial and natural non-nutritive sweeteners drive divergent gut and genetic responses across generations. Frontiers in Nutrition. DOI: 10.3389/fnut.2026.1694149. https://www.frontiersin.org/journals/nutrition/articles/10.3389/fnut.2026.1694149/full