Researchers at the University of Gothenburg have identified a clear link between the composition of gut bacteria and frailty in older women. When people are at high risk of illness and death and have high levels of frailty, gut bacterial diversity is reduced and their function is impaired.
Research published in journals nature communications, Based on a population of 2,081 Swedish women aged 75 to 80 years. This study clearly shows that frailty is associated with reduced gut microbiota diversity and reduced functional capacity. These results were largely confirmed by an independent Chinese cohort of 1,448 older men and women.
Frailty is a common geriatric disease characterized by increased vulnerability to illness, falls, functional disability, and death. This condition is related to several factors such as physical and mental functioning, physiological changes, etc. In this study, we analyzed the genetic material of the gut microbiota in relation to the degree of frailty and clinical outcomes associated with frailty.
To measure frailty, the researchers used an in-house developed and validated index, the Frailty Mortality Index (FMI). This index combines functional, physiological, and psychological aspects related to frailty and mortality risk.
Gut microbiota reflects frailty
This study shows that higher FMI is associated with higher estimated frailty and mortality risk, and is associated with lower microbial diversity, fewer microbial genes, and lower predicted functional capacity within the gut microbiota. These microbial signatures were found to be associated with physical function, mortality, and fall-related injuries.
Researchers identified a total of 404 species of bacteria that are significantly associated with FMI. Many of these associations were also observed in Chinese cohorts, suggesting that certain microbial signatures associated with frailty and mortality may be shared across different geographic and cultural environments.
Our results demonstrate that the gut microbiota reflects an important aspect of frailty in older adults. Of particular interest, some of the associations were replicated in an independent cohort in China, supporting the relevance of our findings. ”
Marina Villar Gerardi, Researcher at Sahlgrenska Academy, University of Gothenburg
Understanding frailty and aging
This result may contribute to a better understanding of the biological processes underlying frailty and aging. In the long term, this knowledge could pave the way for new ways to identify older adults at high risk of adverse health outcomes.
However, the researchers emphasize that this study shows a link and that further research is needed to determine whether changes in the gut microbiome contribute to the development of frailty or could be a target for preventive interventions.
“Frailty is a complex condition and our findings suggest that the gut microbiome may be an important part of the picture. The next step is to investigate whether these microbial patterns can help in risk assessment or form the basis for future interventions,” says Matthias Lorenzon, Professor at the University of Gothenburg and Senior Consultant at Sahlgrenska University Hospital. The study is based on data from the SUPERB cohort of 2,081 older Swedish women. An independent Chinese cohort of 1,448 older adults aged 75–80 years.
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Reference magazines:
Gerardi, V. Others. (2026) Gut microbiota is associated with frailty in older women. nature communications. DOI: 10.1038/s41467-026-75176-5. https://www.nature.com/articles/s41467-026-75176-5
