UCLA study links gut bacteria to faster brain aging in healthy adults
Researchers at the University of California Los Angeles Health Sciences published findings on October 4, 2026, connecting specific gut bacteria to accelerated brain aging.
Study examines young healthy participants
Previous research focused mostly on older adults or people with existing neurological conditions. This new investigation asked whether an older-looking brain matters in younger, generally healthy adults. Scientists examined brain scans to estimate a person's biological age compared to their chronological age.
Bacteria and chemicals drive changes
The study links the pace of brain aging to specific bacteria found in the gut. Chemical byproducts produced by these bacteria also appear connected to the rate of decline. Older-looking brains in the sample were associated with poorer memory, focus, and mood.
Findings published in eBioMedicine
The results suggest biological signs of brain aging can appear decades before obvious symptoms. These findings offer a new perspective on changes that begin long before noticeable problems with thinking arise. The gut could eventually become a target for prevention strategies based on these links.
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