A new mouse study has raised concerns that the effects of artificial sweeteners such as sucralose and stevia may extend beyond direct consumption and could potentially influence metabolic health across generations. The research, published in the journal Frontiers in Nutrition, suggests that changes in gut microbiome composition and gene expression linked to these sweeteners may be passed from parents to offspring. The study was conducted by a team led by Francisca Concha Celume and explored how long-term exposure to sweeteners could affect metabolic markers.

In the experiment, researchers divided 47 male and female mice into three groups: one consuming plain water, and the others receiving water containing sucralose or stevia at levels comparable to typical human dietary intake. The mice were then bred over two generations, both of which were given plain water to observe whether earlier exposure had lingering biological effects.

The study found that offspring of sweetener-exposed mice showed altered glucose tolerance, changes in gut microbiome diversity, and reduced levels of short-chain fatty acids—compounds important for metabolic and digestive health. These effects were more pronounced and persistent in mice exposed to sucralose compared to stevia, with some metabolic changes observed even in the second generation.

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Researchers also reported changes in gene expression linked to inflammation and metabolism, particularly in sucralose-exposed groups. While the mice did not develop diabetes, the study noted early biological signals that could indicate increased vulnerability to metabolic disorders under conditions such as a high-fat diet.

The authors cautioned that the findings do not prove artificial sweeteners cause metabolic diseases in humans but suggest they may influence biological pathways that are not yet fully understood. They added that further research is needed to determine whether similar generational effects could occur in people who regularly consume these additives.

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