Artificial Sweeteners May Impact the Health of Future Generations

New research in mice suggests that widely used artificial sweeteners may cause metabolic changes that can be passed down to future generations, even if those offspring never consume the sweeteners themselves.

The study, published in the journal Frontiers in Nutrition, found that mice given sucralose or stevia passed on alterations in metabolism-related genes, glucose tolerance, and gut microbiome composition to their children and grandchildren. These changes were observed despite the later generations not being exposed to the sweeteners directly.

When we compared generations, these effects were generally strongest in the first generation and tended to decrease in the second generation

Francisca Concha Celume, lead author, Universidad de Chile

The researchers divided 47 male and female mice into three groups: one received plain water, another received water with sucralose, and a third received water with stevia. After observing the effects across generations, they noted that the sweeteners appeared to trigger changes in gut bacteria and gene activity that were then transmitted to subsequent generations.

These findings raise concerns about the long-term biological effects of zero-calorie sweeteners, which are commonly used in diet sodas, sugar-free snacks, and other low-sugar products. While the study does not prove that the same effects occur in humans, it adds to a growing body of research questioning whether non-nutritive sweeteners truly have no impact on the body, as many consumers believe.

Dr Francisca Concha Celume, the lead author of the study, noted that despite the increasing consumption of these additives, rates of obesity and metabolic disorders such as insulin resistance have not declined. This observation prompted the researchers to investigate whether sweeteners might influence metabolism in ways not yet fully understood.

The changes observed by the scientists—including altered gene expression, reduced glucose tolerance, and shifts in the fecal microbiome—could potentially increase vulnerability to metabolic health conditions like type 2 diabetes and cardiovascular disease. This represents particularly notable because many people choose artificial sweeteners specifically to reduce their risk of such conditions.

Health organizations have previously expressed concerns about the potential long-term impacts of artificial sweeteners, suggesting they may interfere with energy metabolism and increase the eventual risk of diabetes or heart disease. The mouse study provides new evidence that these effects might extend beyond the individual consuming the sweeteners to affect future generations.

The study contributes to ongoing scientific debate about the safety of widely used sugar substitutes. While regulatory agencies currently approve sweeteners like sucralose and stevia for human consumption, researchers emphasize that more investigation is needed—particularly long-term and multigenerational studies—to fully understand their biological effects.