A study published in Frontiers in Nutrition reports on Apr. 13 that the consumption of non-nutritive sweeteners by parents may influence the gut bacteria, metabolic signals, and gene expression in their offspring, with sucralose showing the most pronounced effects across generations.
This research is significant because it questions the assumption that artificial sweeteners are metabolically inert and suggests potential health implications for future generations exposed indirectly through parental diet.
Researchers examined how stevia and sucralose intake by four-week-old male and female mice (the F0 generation) affected not only their own gut microbiota but also that of two subsequent generations (F1 and F2), which did not receive direct exposure to these sweeteners. The study tracked changes over time using tests such as oral glucose tolerance, gene expression analysis related to inflammation and metabolism, as well as sequencing to assess fecal microbiota composition.
The results showed that while some glycemic changes were modest or selective—such as lower glucose levels at certain times for males in both stevia- and sucralose-exposed groups—there were more marked differences observed in microbial diversity, short-chain fatty acid production, and gene expression. In particular, "sucralose was associated with elevated Tnf and Tlr4 expression in the intestine and reduced hepatic Srebp1 expression in F0 mice relative to controls." These effects persisted into subsequent generations even when those animals had no direct contact with non-nutritive sweeteners.
According to the researchers, "parental NNS intake induced inter-generational changes in gut microbiota composition, microbial metabolite production, host glycemic responses, and hepatic and intestinal gene expression in the offspring." They further noted that while some of these changes diminished by the second generation (F2), others remained evident—especially among descendants of sucralose-consuming parents.
The findings suggest a need for further studies on how sugar substitutes consumed before conception might impact health outcomes beyond just those who directly consume them. The authors conclude: "These findings challenge the assumption that NNS are metabolically inert and highlight their potential to impact offspring health."
