Scientists are uncovering surprising links between aging and the microscopic communities living in the gut.
Gut health may depend in part on the age of the microbes that live inside us. Scientists suggest that the biological “age” of the gut could be influenced by the bacteria that populate the intestines.
A study published in Stem Cell Reports explored this idea using mice. Researchers from Cincinnati Children’s and Ulm University in Germany found that introducing microbiota from young mice into older mice stimulated intestinal stem cells responsible for producing new tissue. When these stem cells became more active, the intestines recovered more quickly after injury.
Such damage can occur for many reasons, including surgery, radiation therapy, infections, disease, or the gradual effects of aging on the body.
“As we age, the constant replacement of intestinal tissue slows down, making us more susceptible to gut-related conditions. Our findings show that younger microbiota can prompt older intestine to heal faster and function more like younger intestine,” says corresponding author Hartmut Geiger, PhD, director of the Institute of Molecular Medicine at Ulm University and former member of the Division of Experimental Hematology and Cancer Biology at Cincinnati Children’s.
Although prebiotic and probiotic supplements have become increasingly popular, the researchers note that their study used carefully controlled bacterial communities that are not available in consumer products. They also emphasize that these microbes must be introduced through fecal microbiota transfer rather than through over-the-counter supplements.
The power of young bacteria
Experiments using mouse models revealed that aging alters the balance of commensal (or helpful) microbes in the gut. These age-related shifts reduced important biological signals that regulate intestinal stem cells located in the lining of the intestine.
“This reduced signaling causes a decline in the regenerative potential of aged ISCs,” says co-author Yi Zheng, PhD, director, Division of Experimental Hematology and Cancer Biology at Cincinnati Children’s. “However, when older microbiota were replaced with younger microbiota, the stem cells resumed producing new intestine tissue as if the cells were younger. This further demonstrates how human health can be affected by the other life forms living inside us.”
Zheng and Geiger have previously worked together on research aimed at rejuvenating blood stem cells. They are also co-founders of a related start-up company called Mogling Bio. According to Zheng, the new findings build on aspects of their earlier work by examining similar regenerative processes in intestinal stem cells.
The team cautions that more research is necessary before these results can be applied to people. Future studies will need to confirm whether the same benefits occur in humans, determine safe dosing levels, and identify the most effective combinations of microbial species for fecal microbiota transfer.
Reference: “Microbiota from young mice restore the function of aged ISCs” by Kodandaramireddy Nalapareddy, David B. Haslam, Ann-Kathrin Kissmann, Theresa Alenghat, Selina Stahl, Frank Rosenau, Yi Zheng and Hartmut Geiger, 22 January 2026, Stem Cell Reports.
DOI: 10.1016/j.stemcr.2025.102788
Funding sources included grants from the U.S. National Institutes of Health (R01DK104814, R01AG063967, P30DK078392, and R01AG040118) and the Baden-Württemberg Foundation in Germany.
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