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Mouse study links sucralose and stevia to multi-generational metabolic and microbiome changes

Researchers found that exposing mice to zero-calorie sweeteners led to altered gut bacteria and gene activity that persisted in unexposed descendants.

Updated Aug 31, 2026 · 15:30 UTC1 reports

The short version

  • A new study in mice suggests that the zero-calorie sweeteners sucralose and stevia can alter the gut microbiome, reduce beneficial bacterial compounds, and change metabolic gene expression.
  • Some biological shifts, including altered fasting blood sugar and reduced short-chain fatty acids, persisted for up to two generations in offspring that were never directly exposed to the sweeteners.
  • The study showed that sucralose had stronger and longer-lasting multi-generational effects than stevia.
  • Researchers caution that the findings demonstrate associations rather than direct causation, and further study is needed to determine if these effects occur in humans.

Key facts

  • Researchers divided 47 mice into groups receiving either plain water or water containing sucralose or stevia at doses mimicking normal human consumption.[ScienceDaily]
  • Mice exposed to either sweetener developed a more diverse fecal microbiome but had lower concentrations of beneficial short-chain fatty acids, which persisted into two subsequent generations of offspring.[ScienceDaily]
  • First-generation male offspring of the sucralose-exposed group showed signs of impaired glucose tolerance.[ScienceDaily]
  • By the second generation of offspring, elevated fasting blood sugar was observed in male descendants of the sucralose group and female descendants of the stevia group.[ScienceDaily]
  • Sucralose exposure increased the activity of genes linked to inflammation and reduced the activity of metabolism-associated genes, with effects detectable two generations later.[ScienceDaily]
  • Stevia altered gene expression as well, but these changes were weaker than those from sucralose and did not persist beyond the first generation of offspring.[ScienceDaily]

What remains uncertain

  • Because the study was conducted on mice, it is unknown whether the biological responses to non-nutritive sweeteners will translate to humans.[ScienceDaily]
  • The findings show associations rather than proving direct causation, and the mice did not actually develop diabetes during the study.[ScienceDaily]

Sources