Young gut microbiota transplantation improves the metabolic health of old mice.
Level 5 - mechanism / opinion, no new human data
Animal research (mouse model)
PubMed 40444969 · doi:10.1128/msystems.01601-24
What was done
Fecal microbiota transplantation (FMT) was performed using young or old male donor mice into aged male recipient mice. The authors evaluated recipient gut microbial alpha diversity, body weight, fat accumulation, frailty scores, grip strength, and depression- and anxiety-like behaviors. They also performed untargeted metabolomic analysis of serum and stool, along with bulk RNA sequencing of the amygdala.
What was found
Old recipient mice receiving young microbiota had higher alpha diversity than those receiving old microbiota. Compared to old-microbiota FMT, young-microbiota FMT reduced body weight, prevented fat accumulation, lowered frailty scores, increased grip strength, and reduced depression- and anxiety-like behaviors. In serum and stool metabolomics, young-donor FMT reduced age-related long-chain fatty acids and increased amino acid levels. In amygdala transcriptomics, young-donor FMT downregulated inflammatory pathways and upregulated oxidative phosphorylation. No numerical values or effect sizes were reported in the abstract.
Why it matters
This paper demonstrates that restoring a youthful microbiome in aged mice improves body composition, frailty markers, and metabolic and neuroinflammatory profiles, supporting a gut-brain-metabolism link in aging models.
Limits
This is an animal study conducted exclusively in male mice, limiting generalizability to females and humans. Sample sizes, quantitative effect sizes, duration of the intervention, and long-term durability of the effects were not reported in the abstract.
Cited by
- supports Transplanting gut microbiota from young mice into aged mice produces rejuvenative effects.