UCLA study links gut bacteria to faster brain aging — SkimNews
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- UCLA Health researchers published a study in eBioMedicine analyzing brain scans from nearly 1,500 adults across three separate groups, using communication patterns between brain regions at rest to estimate each person's brain age.
- The team built a Brain Aging Index by comparing estimated brain age to chronological age; participants scoring higher performed worse on working memory and executive function tests and reported more depression symptoms.
- Stool sample analysis in one study group linked higher Brain Aging Index to specific gut bacteria and metabolic byproducts, including certain fat molecules, a cholesterol-related compound, and lower levels of the hormone estetrol.
- The associated biological pathways involved the immune system, blood vessel function, communication between brain cells, and the processes cells use to produce energy.
- Unlike prior research focused on older adults or people with neurological conditions, the study deliberately included younger, generally healthy adults to test whether brain aging matters earlier in life.
- Dr. Arpana Church, co-director of UCLA's Goodman-Luskin Microbiome Center, said biological signals of brain aging may be detectable decades before noticeable symptoms, framing the gut microbiome as a potential target for future prevention strategies.
- The patterns repeatedly involved brain regions associated with memory and self-referential thought — the mental processes people use when thinking about themselves and their own experiences.
Why it matters: The study extends brain-aging research from older and diagnosed populations to ~1,500 younger, generally healthy adults, providing evidence that brain-aging signals appear in people without obvious symptoms. The cross-sectional design keeps any gut-targeted intervention in the research phase, but identifies specific bacterial and metabolic signatures worth investigating further.
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