Study Finds Unexpected Gut Bacteria Effects From Sweeteners, Especially in Drug Combinations
A comprehensive laboratory study has revealed that many commonly used sweeteners can directly affect the growth of gut bacteria, raising new questions about their safety and potential interactions with other substances.
Researchers tested 39 different sweeteners and identified more than 100 cases where these sweeteners behaved differently than expected when combined with medications, caffeine, or flavorings. The study highlights the complexity of how sweeteners interact with the gut microbiome.
One particularly notable finding involved the combination of isosteviol—a sweetener derived from stevia—and duloxetine, an antidepressant. This specific pairing was found to be especially disruptive, reducing both beneficial bacteria populations and overall microbial diversity in the gut.
The study underscores the importance of considering sweetener interactions beyond their direct consumption, particularly when people are taking medications or consuming sweeteners as part of a mixed diet. While laboratory findings require further validation through human studies, the research suggests that sweetener safety assessments may need to account for combination effects rather than evaluating sweeteners in isolation.