Gut Microbe And Aging
Gut Microbe And AgingPosted by Malcolm on 16-09-2026
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A Nature Aging study suggests a gut bacterium, Bifidobacterium pseudocatenulatum (BP), and its molecule 5-AVAB may support healthy aging.
They were linked to younger biological age in humans and better age-related outcomes in older mice, but neither is yet proven to slow aging in humans.
A Gut Bacterium That Declines With Age
Researchers analyzed Chinese aging cohorts and found two broad gut microbiome patterns: one dominated by Bacteroides and the other by Prevotella. Among people with the Prevotella-dominant pattern, beneficial bacteria declined more rapidly with age, while microbes carrying virulence factors and antibiotic-resistance genes became more common.
One bacterium stood out across all groups. Levels of BP fell sharply with age in both women and men, regardless of their overall microbiome pattern.
Using a newly developed microbiome aging clock called MicroAge, the team also found that people with higher levels of BP tended to show a younger biological age. The same pattern was supported by several routine clinical health indicators.
A Metabolite May Explain The Effect
The researchers then investigated how BP might influence aging.
They traced much of its apparent effect to 5-AVAB, a small molecule produced by the bacterium. Circulating levels of 5-AVAB also declined with age in humans.
When older mice were given 5-AVAB directly, their memory, motor coordination and mood-related behaviors improved. Researchers also observed lower levels of chronic low-grade inflammation in several organs, including the liver, lungs, muscles, kidneys, heart and spleen.
Similar effects were seen when the animals received the live BP bacterium itself.
Researchers See A Possible New Approach
The study team explained that the results point to a potentially simple strategy for supporting healthy aging: restoring a beneficial bacterium that becomes less abundant with age or supplementing the key metabolite it produces.
According to the researchers, the close similarity between the effects of BP and 5-AVAB suggests that the metabolite may be an important mechanism behind the bacterium’s apparent benefits. They also noted that the findings connect age-related changes in the gut microbiome with measurable differences in inflammation, behavior and physical function.
However, the strongest experimental evidence comes from mice. The human data mainly show associations, so clinical trials would be necessary before BP or 5-AVAB could be considered an established treatment for slowing age-related decline.
What The Study Means
The research adds to growing evidence that the gut microbiome may influence aging far beyond the digestive system. Gut bacteria produce molecules that can circulate through the body and potentially affect multiple organs and biological processes.
For now, the study offers a possible explanation for how the age-related loss of one bacterium could be linked to changes in health. Whether restoring BP or supplementing 5-AVAB can safely produce similar effects in people remains an open question.
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