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A UCLA study found that adults whose brain scans appeared older than their chronological age tended to perform worse on working-memory and executive-function tests and report more depressive symptoms. In one of three groups, a higher brain-aging index was also associated with specific gut bacteria and metabolic compounds; the study does not show that gut microbes cause brain aging.
Researchers at UCLA Health found that adults whose brains appeared older than their chronological age tended to score worse on tests of working memory and executive function and report more depressive symptoms. In one of three study groups, the brain-age measure was also associated with particular gut bacteria and metabolic compounds, suggesting a possible connection that the study does not establish as causal.
The study, published in eBioMedicine, examined brain scans from nearly 1,500 adults across three groups. The researchers analyzed how brain regions communicated while participants were at rest, then used a computer model to estimate an age from those patterns. They compared that estimate with each person’s chronological age; the difference was called the Brain Aging Index (BAI).
Across the three groups, participants with a higher BAI generally performed worse on working-memory and executive-function tests. These abilities support holding information in mind, concentrating, planning and organizing. A higher BAI was also associated with more self-reported depressive symptoms. The study described recurring patterns in brain areas linked to memory and self-referential thought.
For one group, the team also analyzed stool samples. A higher BAI was associated with certain gut bacteria and several metabolic byproducts, including some fat molecules, a cholesterol-related compound and lower levels of the hormone estetrol. The researchers linked these signals to pathways involving immune activity, blood-vessel function, communication between brain cells and cellular energy production. The microbiome analysis was limited to that group, and the reported associations do not show that the bacteria or compounds caused the brain or cognitive differences.
Early Signals Across Brain and Gut
The findings add to research into whether measurable differences in brain aging can appear before obvious problems with memory or thinking. Earlier work, as described in the study report, largely examined older adults or people who already had neurological conditions. Studying generally healthy adults broadens the question to whether brain-age patterns are also associated with cognitive and mood measures earlier in life.
The gut findings may help researchers identify biological pathways to investigate, but they do not establish a way to predict an individual’s future decline or prevent it. The results also do not show that changing diet, taking supplements or altering gut bacteria would improve brain health. For readers, the current value is a research lead—not a validated test or a basis for personal health decisions.
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How the Brain-Age Measure Works
Brain age is an estimate derived from features of a brain scan, not a person’s actual age or a diagnosis. In this study, the model used patterns of communication between brain regions at rest. A brain estimated to be older than the participant’s chronological age produced a higher Brain Aging Index.
The researchers compared this index with cognitive test results and reported mood symptoms. They also looked for microbiome links in stool samples from one of the three groups. Because the gut analysis was not described across all participants, its results should not be read as a finding about every person included in the broader brain-scan analysis.
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Causation and Prediction Remain Open
The reported results show associations, not that gut bacteria or their chemical products speed up brain aging. The source report does not establish whether microbiome differences precede changes in brain-age estimates, follow them, or share other influences. Nor does it show that modifying the gut microbiome changes cognitive performance or mood.
It is also unclear from the report how well the brain-age measure would predict later decline for an individual, or whether the associations apply beyond the study groups. The gut-sample findings came from one group, and the report does not provide enough detail to determine how specific microbes or compounds performed as predictors. The measure is not presented as a clinical diagnostic test.
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Testing Risks and Possible Interventions
Church said the findings could guide further work on whether gut health can be targeted to support healthier brain aging. The next research steps would need to test whether the observed links hold in other groups, clarify the direction of the relationships and determine whether changes to gut-related factors affect brain or cognitive outcomes.
Until those questions are answered, the study supports continued investigation rather than a change in clinical practice. The report does not identify a proven gut-based strategy for preventing cognitive or mood-related decline.
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Key Questions
What did the UCLA researchers find?
Across three groups, a higher Brain Aging Index was generally associated with weaker working-memory and executive-function test results and more reported depressive symptoms. In one group, it was also associated with specific gut bacteria and metabolic compounds.
Does the study show that gut bacteria cause the brain to age faster?
No. The study reported associations and does not establish that gut bacteria or their byproducts cause changes in brain aging, memory or mood.
What is the Brain Aging Index?
It is the difference between a computer model’s estimate of a participant’s age based on resting brain-communication patterns and that participant’s chronological age. It is a research measure, not described as a diagnosis.
Can people use the findings to predict their own brain health?
The report does not establish the measure as an individual prediction tool or clinical test. It also does not show that changing gut bacteria would prevent cognitive or mood-related decline.
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