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A UCLA study found that adults whose brains appeared older than their chronological age tended to score lower on working-memory and executive-function tests and report more depressive symptoms. In one of three study groups, higher brain-aging scores were also associated with specific gut bacteria and metabolic compounds; the findings do not show that gut changes cause brain aging.
UCLA Health researchers found that adults whose brains appeared older than their actual age tended to have weaker scores on memory and executive-function tests and report more depressive symptoms; in one of three groups, the brain-aging measure was also associated with specific gut bacteria and metabolic compounds. The study, published in eBioMedicine, identifies links rather than proof that gut microbes cause changes in the brain.
The team analyzed brain scans from nearly 1,500 adults across three separate groups. The scans measured how brain regions communicated while participants were at rest. Researchers used those patterns to build a computer model estimating each participant’s age, then compared that estimate with chronological age. The difference was called the Brain Aging Index (BAI); a higher index meant the brain appeared older relative to the person’s actual age.
Across all three groups, a higher BAI was associated with poorer performance on tests of working memory and executive function, abilities involved in holding information in mind, focusing, planning and organizing. Participants with higher scores also reported more symptoms of depression. The researchers said the patterns repeatedly involved brain regions associated with memory and self-referential thought.
For one group, the researchers also analyzed stool samples. A higher BAI was associated with particular gut bacteria and several metabolic byproducts, including certain fat molecules, a cholesterol-related compound and lower levels of the hormone estetrol. The associated biological pathways related to immune activity, blood-vessel function, communication between brain cells and cellular energy production. The source report does not identify a causal direction for these relationships.
Early Clues Beyond Brain Scans
The results extend brain-aging research to adults who were not selected for being older or having neurological conditions, the populations that much earlier work emphasized. The associations suggest that brain-age estimates may track with cognitive performance and mood before obvious memory or thinking problems arise. They also give researchers a reason to investigate whether gut-related signals could help explain differences in brain health.
That possibility is not yet a basis for a screening test or a gut-focused treatment. The study found associations, and stool and brain measures from one group cannot establish that changing a person’s microbiome would alter their brain-aging score, memory, mood or future risk. The findings matter as a research lead: they point to biological relationships that future studies can test, rather than a proven way to prevent decline.
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How Researchers Estimated Brain Age
“Brain age” is an estimate derived from biological measurements, not a person’s calendar age or a standalone diagnosis. In this study, the model used patterns of communication among brain regions at rest to estimate age. The Brain Aging Index represented the gap between that estimate and chronological age; it was not described as a direct measure of how quickly an individual’s brain was changing over time.
Previous studies had linked older-appearing brains with poorer cognition and mood, according to the report, but had mainly focused on older adults or people with neurological conditions. The UCLA team’s analysis asked whether similar relationships were present among generally healthy adults and whether gut samples might provide another associated biological signal. The gut analysis was conducted in one of the three groups, not across the full study population.
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Cause, Prediction and Treatment Unresolved
The findings do not establish whether gut bacteria or their byproducts influence brain aging, whether brain-related changes affect the gut, or whether other factors contribute to both. The report describes associations in one study group’s stool samples, so it is not clear how broadly those gut findings apply to the other participants or to the general population.
The available report also does not provide enough detail to determine how well the BAI predicts future cognitive or mood-related decline, or whether it adds useful information beyond other measures. It does not report that participants were followed to test whether their brain-age estimates changed over time. No gut-based prevention or treatment was evaluated, and the findings do not show that altering diet, bacteria or metabolites would improve brain health.
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Further Studies Must Test the Links
The next step is for researchers to test whether the associations hold in other groups and over time, and to clarify how the gut, its metabolites and brain function may relate to one another. Studies that follow participants could assess whether a higher BAI predicts later changes in cognition or mood; research testing possible interventions would be needed before claiming that targeting gut health changes those outcomes.
Church said the findings may help researchers investigate who could be at risk and where intervention might be possible. For now, the study offers early research leads, not a clinical test or a recommendation for individuals. The source report does not specify a timetable for follow-up studies.
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Key Questions
What does a higher Brain Aging Index mean?
It means the study’s scan-based computer model estimated a participant’s brain age as older relative to their chronological age. It is a research measure, not a diagnosis or a direct measurement of how quickly the brain is changing.
What did the study find about gut bacteria?
In one of the three groups, a higher Brain Aging Index was associated with specific gut bacteria and metabolic byproducts, including certain fat molecules, a cholesterol-related compound and lower estetrol levels. The researchers did not establish that these gut differences caused the brain-related findings.
Does the study show that changing gut health can slow brain aging?
No. The study reported associations and did not test whether changing gut bacteria or metabolites affects brain age, memory, mood or future decline.
Were all participants tested for gut bacteria?
No. The report says stool samples were examined for one of the study’s three groups. Brain scans were analyzed across nearly 1,500 adults in the three groups.
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