Gut Microbiota Dynamics in Aging and Health

The gut microbiota undergoes profound compositional and functional shifts across the human lifespan, with mounting evidence of its role in host ageing and health. In early life, microbial diversity expands rapidly, stabilising in adulthood and often declining in later decades. Age‐associated dysbiosis is characterised by reduced beneficial symbionts, enrichment of pro‐inflammatory taxa and altered production of key metabolites such as short‐chain fatty acids. These changes influence intestinal barrier integrity, immune homeostasis and systemic metabolism, contributing to chronic low‐grade inflammation, frailty and metabolic disorders. Interindividual variation in microbial trajectories reflects genetics, diet, lifestyle and environment, highlighting the potential of targeted microbiota modulation to promote healthy longevity on a global scale.

Research from Nature Portfolio

Recent studies have demonstrated that administration of heat‐inactivated probiotics can rejuvenate the aged intestinal niche. In ageing mouse models, treatment with inactivated Bifidobacterium adolescentis restored intestinal stem cell populations and reinforced barrier function via activation of Wnt/β-catenin signalling. This effect was mediated by Paneth-like cells producing soluble polysaccharides, which acted as key effectors in stimulating stem‐cell regeneration. Findings point to non-viable microbial preparations as promising interventions to delay colon senescence and to preserve epithelial homeostasis during ageing.

Gut Microbiota Dynamics in Aging and Health publication trend

The graph below shows the total number of articles in gut microbiota dynamics in aging and health across all publications each year (not limited to Nature Index journals).

Technical terms

Gut microbiota: The community of microorganisms residing in the gastrointestinal tract, including bacteria, archaea, viruses and fungi.

Dysbiosis: An imbalance in microbial composition that disrupts host–microbe symbiosis and can promote disease.

Intestinal barrier integrity: The capacity of the gut epithelium to prevent translocation of microbes and toxins into systemic circulation.

Metabolic endotoxemia: Low-grade elevation of circulating bacterial lipopolysaccharide that triggers chronic inflammation.

Paneth‐like cells: Specialized epithelial cells that secrete antimicrobial factors and support intestinal stem cells.

References

1. Heat-inactivated Bifidobacterium adolescentis ameliorates colon senescence through Paneth-like-cell-mediated stem cell activation. Nature Communications (2023).
2. Visceral adiposity in postmenopausal women is associated with a pro-inflammatory gut microbiome and immunogenic metabolic endotoxemia. Microbiome (2024).
3. Gut Microbiota is Associated with Aging‐Related Processes of a Small Mammal Species under High‐Density Crowding Stress. Advanced Science (2023).
4. Age-related changes in gut microbiota composition from newborn to centenarian: a cross-sectional study. BMC Microbiology (2016).
5. Age-Associated Microbial Dysbiosis Promotes Intestinal Permeability, Systemic Inflammation, and Macrophage Dysfunction. Cell Host & Microbe (2017).