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University of Hawaiʻi at Mānoa researchers found that gut bacterial communities were associated with blood-based measures of biological aging in 123 adults. The study links some microbes with slower or faster aging, but does not show that the bacteria cause those differences or that changing the microbiome would slow aging.
Researchers at the University of Hawaiʻi at Mānoa found that gut bacterial communities were associated with blood-based measures of how quickly adults were biologically aging, according to a study published in Scientific Reports. The analysis of 123 adults linked some bacterial species with slower aging and others with faster aging, but it does not establish that the microbes cause those differences.
The researchers examined stool and blood samples from 123 adults spanning a range of ages. They identified participants’ gut bacteria and compared the bacterial communities with molecular markers in blood, including DunedinPACE, a measure intended to estimate the pace of biological aging. Unlike chronological age, this measure concerns aging-related changes rather than the number of years a person has lived.
The study found that differences in gut bacterial communities accounted for approximately 15% of the variation in participants’ biological aging rates. The researchers reported that Bifidobacterium adolescentis was among the bacteria most strongly associated with slower biological aging. Succinivibrio dextrinosolvens showed one of the strongest associations with faster aging. These are observed associations, not evidence that either species changes a person’s aging rate.
Senior author Alika K. Maunakea said the microbial patterns were associated with molecular aging measures even when chronological age was accounted for. Lead author Braden P. Kunihiro said the results add to research into precision health, which examines how health patterns differ among individuals. The study also included Native Hawaiian and Pacific Islander participants, populations that the source report says have been underrepresented in research on aging and gut microorganisms.
What the Gut Signals May Reveal
The findings add to evidence that the gut microbiome may be associated with health processes beyond digestion. Because gut bacteria can vary with diet, lifestyle and environmental conditions, researchers see the microbiome as a potential source of information about differences in biological aging. That could eventually help scientists investigate why people with the same chronological age show different molecular aging patterns.
For readers, the study is an early research result, not a basis for choosing supplements, changing diets to target particular bacteria or expecting to slow aging. The reported 15% figure describes variation in this study’s participants; it does not show that changing gut bacteria could alter aging by 15%, nor does it predict an individual’s health or lifespan.
Including Native Hawaiian and Pacific Islander participants also broadens the population represented in this area of research. Co-author Ruben Juarez said examining the microbiome may help researchers explore how behavior, environment and social conditions relate to long-term health. The study does not, by itself, identify which of those factors produced the bacterial or aging patterns.
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How Researchers Measured Aging
The study compared two kinds of biological information: gut bacteria identified from stool and aging-related molecular markers measured in blood. DunedinPACE is intended to estimate the rate at which aging-related changes are occurring. It is distinct from a person’s chronological age, and it should not be read as a direct measure of lifespan or as a diagnosis.
The research team’s analysis looked for relationships between the bacterial communities and the blood-based measures. According to the report, the microbial patterns remained significantly associated with molecular measures of aging independently of chronological age. The study was observational: it recorded patterns in samples rather than assigning participants to interventions that changed their microbiomes.
The source report describes the findings as an early step toward understanding the microbiome’s relationship with healthy aging. It does not provide evidence that a specific food, probiotic or other intervention would produce the bacterial patterns associated with slower aging. Nor does it establish whether the microbial differences precede, follow or develop alongside differences in biological aging.
“The gut microbiome is highly responsive to lifestyle, diet, environment and other everyday exposures.”
— Braden P. Kunihiro, lead author
Cause and Effect Remain Unknown
The study does not establish that gut bacteria cause a slower or faster pace of biological aging. It is possible that the microbial patterns reflect other influences, that aging-related changes affect the gut environment, or that multiple factors are involved. The results do not determine which explanation is correct.
It also remains unknown whether deliberately changing the microbiome could alter DunedinPACE or improve long-term health. The report does not describe a clinical trial testing a diet, probiotic or other treatment. The sample of 123 adults also limits how confidently these associations can be applied to wider populations. Further research is needed to test the findings and clarify how they may differ across groups.
Studies Must Test Microbiome Changes
The researchers say future studies will need to examine the mechanisms behind the associations and test whether microbial signatures can contribute to personalized approaches to healthy aging. A key next step will be determining whether the relationships hold in larger or different groups and whether they persist when other relevant factors are taken into account.
Research that follows participants over time, or directly tests interventions that change gut bacteria, could help address whether microbiome changes precede changes in biological aging. Until such evidence is available, the present findings are best understood as a reported link between gut bacterial patterns and a molecular aging measure—not proof that modifying the microbiome slows aging.
Key Questions
What did the study find?
In 123 adults, researchers found that gut bacterial communities were associated with blood-based measures of biological aging. The study reported different associations for particular bacterial species, but did not show that those species cause aging changes.
Which bacteria were linked to slower or faster aging?
Bifidobacterium adolescentis was among the species most strongly associated with slower biological aging. Succinivibrio dextrinosolvens showed one of the strongest associations with faster aging. These findings describe associations in the study, not proven effects.
Does the research show that changing gut bacteria slows aging?
No. The study was observational and did not test a treatment or other intervention. Researchers say further studies are needed to determine whether changing the microbiome can affect biological aging or long-term health.
What does the 15% figure mean?
The report says differences in gut bacterial communities accounted for approximately 15% of the variation in participants’ biological aging rates. It is a result from this study’s analysis, not an estimate that changing bacteria would slow aging by 15%.
Source: sciencedaily.com
