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A University of Hawaiʻi at Mānoa study of 123 adults found that gut bacterial patterns were associated with blood-based measures of biological aging. The researchers reported that microbiome differences accounted for about 15% of variation in aging pace, but the study does not show that particular bacteria cause slower or faster aging.
Researchers at the University of Hawaiʻi at Mānoa found that gut bacterial patterns were associated with the pace of biological aging in a study of 123 adults. Published in Scientific Reports, the research linked the microbiome—the community of microorganisms in the digestive system—with a blood-based aging measure, but it does not show that gut bacteria cause the body to age faster or slower.
The research team analyzed participants’ stool and blood samples, identifying gut bacteria and comparing them with molecular markers used to estimate biological aging. The measure, called DunedinPACE, is intended to capture the pace of aging-related changes rather than a person’s chronological age.
The researchers reported that differences in gut bacterial communities accounted for approximately 15% of the variation in participants’ measured aging rates. Among individual species, Bifidobacterium adolescentis was strongly associated with slower biological aging, while Succinivibrio dextrinosolvens was strongly associated with faster aging. These are associations in the study population, not evidence that either species directly changes aging.
Lead author Braden P. Kunihiro said the microbiome is responsive to influences such as diet, lifestyle and environment. The study also included Native Hawaiian and Pacific Islander participants, populations the researchers said have been underrepresented in research on aging and gut microorganisms.
What the Microbiome May Reveal
The findings add evidence that gut microbial patterns may be useful to researchers studying differences in biological aging. Unlike chronological age, microbiome composition can vary with everyday exposures, making it a possible source of clues about how behavior and environment relate to health over time.
The reported 15% refers to variation in aging rates accounted for by differences in bacterial communities within this study. It is not a measure of how much an individual’s aging can be slowed, nor a prediction of any person’s lifespan or health. The results may guide further research, but they do not support changing a diet or taking a product to target the named bacteria as an anti-aging treatment.
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How Researchers Measured Aging
Chronological age counts the years a person has lived. Biological aging measures instead use molecular indicators to estimate age-related changes in the body. In this study, the team compared blood-based DunedinPACE measurements with bacteria identified from stool samples.
The study was published in Scientific Reports and examined adults across a wide range of ages. Its inclusion of Native Hawaiian and Pacific Islander participants could help broaden research into how social and environmental conditions relate to microbiome patterns and long-term health. The reported findings are an early association, not a test of an intervention or a demonstration of mechanism.
“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 found associations, not causation. It cannot establish whether particular bacteria influence biological aging, whether aging-related changes affect the gut microbiome, or whether other factors help explain both. The findings also do not show that altering the microbiome would change DunedinPACE or improve long-term health.
The study involved 123 adults; the source material does not provide details needed to judge how well the results generalize to other populations. The researchers have not established a mechanism for the observed relationships, and the reported bacterial associations should not be treated as proven health effects.
Further Studies Must Test the Links
The researchers said further work is needed to identify the mechanisms behind the microbiome-aging associations and determine whether the microbial signatures have a role in future precision-health research. Studies that track participants over time or test specific interventions would be needed to address whether changing gut bacteria can affect biological aging.
Until that evidence is available, the results are best understood as a research lead rather than personal guidance. The next key question is whether the associations persist in larger and more diverse groups, and whether experiments can separate the effects of microbiome changes from diet, environment and other influences.
Key Questions
What did the study find?
In 123 adults, gut bacterial patterns were associated with DunedinPACE, a blood-based measure of biological aging. The researchers said microbiome differences accounted for about 15% of variation in measured aging rates within the study.
Which bacteria were associated with aging pace?
Bifidobacterium adolescentis was associated with slower biological aging, while Succinivibrio dextrinosolvens was associated with faster aging. The results do not establish that these bacteria cause either outcome.
Does the research show that changing gut bacteria slows aging?
No. The study was observational and reported associations rather than cause and effect. It did not test a diet, supplement or other intervention to change the microbiome.
What does biological aging mean in this research?
It refers to molecular measures intended to estimate the pace of age-related changes in the body. The study used DunedinPACE, which differs from chronological age, or the number of years a person has lived.
Source: sciencedaily.com
