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The gut microbiota greatly influences host physiology, including immune regulation, metabolic balance, and brain health. Aging is associated with alterations in the gut microbiome, including reduced microbial diversity and increased pro-inflammatory bacteria, which are linked to age-related decline and chronic diseases. This review examines the impact of the gut microbiota on key indicators of aging, including cellular senescence, mitochondrial dysfunction, alterations in gene expression, and immune system modifications. It also examines microbiome-related diseases associated with aging, including neurodegeneration, cardiovascular issues, metabolic syndrome, and frailty. Additionally, it highlights evidence-based methods to restore a youthful microbial profile. New findings suggest that certain microbial substances, including short-chain fatty acids, urolithins, and bile acids, play a role in regulating inflammation, maintaining barrier integrity, and influencing metabolism. Age-related diseases are often associated with molecular pathways driven by an imbalance in the gut microbiome. Various intervention strategies, from dietary changes and probiotics to personalized nutrition and fecal microbiota transplantation, have shown promise in reversing signs of microbial aging and improving health outcomes in both lab and human studies. Overall, the gut microbiome serves as both a marker and a regulator of healthy aging. Treatments that restore microbial balance offer hopeful ways to extend healthy living. Future studies should focus on developing long-term, multifaceted, and personalized methods to identify causal pathways and enhance microbiota-based strategies for various aging populations.
Chatterjee et al. (Sun,) studied this question.