Researchers at the University of Minnesota found that kombucha consumption was associated with reduced anxiety- and depression-related behaviors in mice.
Kombucha is a fermented drink that may do more than support digestive health. Researchers at the University of Minnesota found that kombucha consumption was associated with reduced anxiety- and depression-related behaviors in mice, along with changes in gut bacteria that may influence communication between the gut and brain.
The study, published in Food Bioscience, explored whether the potential mood benefits of kombucha were linked to changes in the gut microbiome, the community of microorganisms living in the digestive tract.
To investigate the effects of kombucha, researchers studied mice eating two different diets: one high in fat and sugar and another lower in fat and sugar. For seven weeks, the mice received kombucha three times a week. A control group received water on the same schedule.
The results revealed several notable findings:
Reduced anxiety- and depression-related behaviors: Mice that consumed kombucha displayed behavioral changes associated with improvements in mood.
Changes in gut bacteria: Kombucha consumption altered the diversity of gut microbes and increased certain bacteria, microbial functions and metabolites associated with gut health.
Potential gut-brain communication benefits: Researchers identified changes in biological processes involved in communication between the digestive system and the brain.
Although both groups of mice experienced behavioral benefits, the effects differed depending on their diets. This suggests that diet may influence how fermented foods affect the gut-brain connection.
"This work shows preliminary and preclinical evidence that frequent consumption of kombucha could be associated with improvements in mental health," said lead author Noor e Huma, a graduate student in the University of Minnesota's College of Food, Agricultural and Natural Resource Sciences.
The findings highlight the importance of considering diet not only in the context of physical health but also as a potential factor in mental well-being.
Kombucha tea contains microorganisms and compounds produced during fermentation. Other fermented foods, including yogurt and sauerkraut, can also provide beneficial microbes and fermentation-derived compounds that may influence the gut microbiome.
Scientists are increasingly investigating the gut-brain axis, the two-way communication network connecting the digestive system and the brain. Gut microbes may influence this system through several pathways, including the production of metabolites and other compounds involved in signaling.
Changes in the gut microbiome have been linked to a variety of health processes, making fermented foods an area of growing scientific interest. However, researchers are still working to understand which microorganisms and compounds may be responsible for specific effects.
While these findings are promising, the study was conducted in mice, not humans, so the results do not necessarily mean that drinking kombucha will reduce anxiety or depression in people.
Researchers plan to conduct additional behavioral tests and investigate more thoroughly how fermented foods influence signaling between gut microbes and the brain.
In the meantime, fermented foods such as kombucha, yogurt and sauerkraut can be considered as part of a varied, balanced diet. Kombucha's sugar content can vary considerably by product, so checking the nutrition label is worthwhile.
The larger takeaway is that nutrition may influence more than digestion and physical health. As researchers learn more about the gut-brain connection, fermented foods could offer valuable clues about how dietary choices affect mental well-being.
For now, however, more human research is needed before kombucha can be recommended as a proven strategy for improving mood.
