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Getting the latest healthcare news for you
Your diet soda habit might have longer-lasting effects than you think. A new mouse study found that sucralose and stevia altered gut bacteria, disrupted metabolic gene activity, and impaired blood sugar regulation — with some effects passing down to offspring that never consumed the sweeteners at all. Researchers say the findings call for more investigation and moderation, not alarm.
Your diet soda habit might have longer-lasting effects than you think. A new study published in Frontiers in Nutrition found that two of the most popular zero-calorie sweeteners — sucralose and stevia — altered gut microbiome composition, reduced beneficial short-chain fatty acids, and changed the activity of genes tied to metabolism and inflammation in mice. What's more surprising: some of those changes showed up in the next two generations of mice that never consumed the sweeteners themselves.
Sucralose appeared to produce stronger and more persistent effects. First-generation male offspring of sucralose-exposed mice showed impaired glucose tolerance, while second-generation descendants of both sweetener groups showed elevated fasting blood sugar. Stevia's effects were milder and faded after one generation. Researchers caution that these findings show associations, not causation, and that human responses may differ from those observed in animal models.
Key Takeaways
Why it matters: With obesity and metabolic disorders still rising despite widespread use of "healthier" sugar substitutes, these findings raise important questions about whether non-nutritive sweeteners are as benign as once thought — and whether their biological effects could extend beyond the individual consumer.
