TL;DR
Get health and wellness essentials delivered free — and shop member deals
- Fast, free delivery on millions of items
- Access to Prime Big Deal Days deals on October 6–7
- Prime Video, Amazon Music and more included
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 depression symptoms. In one study group, brain-aging scores were also associated with specific gut bacteria and metabolic compounds; the findings show associations, not that gut microbes cause brain aging.
A study by UCLA Health researchers found that adults whose brain scans suggested their brains were older than their actual age tended to perform worse on some memory and thinking tests and report more depression symptoms. In one of three participant groups, the researchers also linked brain-age scores to specific gut bacteria and metabolic compounds, raising a research question about how the gut and brain may be connected—but not showing that gut microbes cause brain aging.
The researchers analyzed brain scans from nearly 1,500 adults across three groups. They used a method that measures communication between brain regions while a person is at rest, then used a computer model to estimate each participant’s age from those patterns. The gap between estimated and chronological age was termed the Brain Aging Index.
Across all three groups, a higher index—meaning a brain appeared older relative to a participant’s age—was generally associated with lower performance on tests of working memory and executive function. These skills include holding information in mind, focusing, planning and organizing. Higher scores were also associated with participants reporting more symptoms of depression. The study described recurring patterns in brain areas linked to memory and self-referential thought.
Stool samples were available for one group. In that group, the researchers reported associations between higher Brain Aging Index scores and certain gut bacteria, as well as several metabolic byproducts. The reported signals included certain fat molecules, a cholesterol-related compound and lower levels of estetrol, a hormone. The researchers connected these signals with pathways involving immune activity, blood-vessel function, communication between brain cells and cellular energy production. The findings do not establish that the bacteria or compounds caused the differences in brain scans or test results.
Early Signals Across Brain and Gut
The work extends research on brain-age estimates to younger, generally healthy adults, rather than focusing only on older people or those already diagnosed with neurological conditions. It suggests that differences in brain function associated with age estimates may be measurable before a person notices problems with memory or thinking. That could give researchers a way to study when such patterns emerge, though this study does not show that the index predicts an individual’s future health.
The gut findings offer a possible avenue for investigating links between the microbiome and brain health. If future research confirms the associations and clarifies how they work, scientists could test whether gut-related factors help identify people who may benefit from closer study or preventive approaches. For now, the results do not support changing diet, taking supplements or pursuing treatment to slow brain aging based on a stool test.
probiotic supplements for gut health
As an affiliate, we earn on qualifying purchases.
As an affiliate, we earn on qualifying purchases.
How Researchers Estimated Brain Age
“Brain age” in this study refers to a model-based estimate, not a direct measure of a person’s age or a clinical diagnosis. The researchers calculated it from patterns of communication between brain regions at rest, then compared that estimate with chronological age. A higher Brain Aging Index indicated that the brain appeared older relative to the participant’s age under this approach.
Earlier research had associated older-appearing brains with poorer memory, weaker thinking skills and mood changes, according to the supplied study report. Much of that work involved older adults or people with neurological conditions. The UCLA study asked whether similar relationships could be observed in younger, generally healthy adults and whether gut measurements might also be related. Its findings were published in eBioMedicine.
As an affiliate, we earn on qualifying purchases.
Association, Not Cause or Prediction
The reported results show associations; they do not establish that gut bacteria or their byproducts speed up or slow down brain aging. The study summary also does not say that the Brain Aging Index can predict who will later develop cognitive decline, depression or a neurological disorder. The gut analysis came from only one of the three groups, so the summary does not establish whether those microbiome findings would hold in the other groups or in different populations.
Further details needed to judge the findings’ reach include the participants’ age ranges and demographic composition, the specific bacteria and compounds identified, the size of the reported associations, and how the researchers accounted for possible confounding factors. The supplied report does not provide those details. It also does not describe a clinical test or show that changing the microbiome affects brain-age estimates or cognitive outcomes.
As an affiliate, we earn on qualifying purchases.
Testing the Gut-Brain Connection
The next research step is to test whether the reported gut-microbe and metabolite associations can be reproduced in other groups and to investigate possible biological mechanisms. Studies that follow participants over time could help establish whether brain-age estimates and microbiome measures are related to later changes in cognition or mood, rather than simply occurring together at one point.
Researchers would also need intervention studies to determine whether deliberately changing gut-related factors affects brain function or health outcomes. Church said the findings could help identify pathways for future work on risk and prevention, but no specific intervention or timetable was given in the supplied report. Until further evidence is available, the study is best understood as an early investigation of links among brain scans, cognitive and mood measures, and gut biology.
As an affiliate, we earn on qualifying purchases.
Key Questions
What does “brain age” mean in this study?
It is a computer-model estimate based on patterns of communication between brain regions during rest. Researchers compared that estimate with each participant’s chronological age to calculate the Brain Aging Index.
What did the study find about memory and mood?
Across three participant groups, higher Brain Aging Index scores were generally associated with lower working-memory and executive-function test performance and more reported depression symptoms. These are associations, not proof that an older-appearing brain caused those outcomes.
Does the research show gut bacteria cause brain aging?
No. The researchers reported links between brain-age scores and certain gut bacteria and metabolic compounds in one study group. The results do not establish cause and effect.
Can a stool test predict how quickly my brain is aging?
The supplied report does not describe a validated stool test for that purpose. It does not show that these findings can predict an individual’s future cognitive health or guide clinical decisions.
Could changing gut health slow brain aging?
The study raises that possibility as a topic for future research, but it did not test an intervention or show that changing gut bacteria affects brain aging. No gut-directed treatment was established by these findings.
Source: rss
Halloween Picks
halloween
As an affiliate, we earn on qualifying purchases.
