Low-cal sweeteners can change gut bacteria

Key Points:

• A new University of Cambridge study found that many natural and artificial sweeteners commonly used in sugar-free and low-calorie products can interfere with the growth of gut bacteria important for digestive health.
• Researchers observed over 100 cases where sweeteners' effects on bacteria changed when combined with other substances like caffeine, vanilla, or medications, highlighting complex interactions within the gut microbiome.
• A notable finding was the combination of isosteviol (from stevia) and the antidepressant duloxetine, which significantly suppressed beneficial gut bacteria linked to metabolism and digestive health, potentially impacting millions of patients using the drug.
• The combined exposure to these substances reduced microbial diversity and altered the gut bacterial community in lab models, with additional effects on immune and inflammatory cell functions, suggesting possible broader health implications.
• While the study does not confirm direct harm in humans, it raises important questions about how sweeteners and their interactions with other compounds might influence health, warranting further research into real-world effects and safe consumption levels.