Gut microbiota at high altitude: microbial remodeling, immunity, and adaptation
A systematic review describes how high-altitude environments restructure gut microbiota and modulate immune responses via microbial metabolites.
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What the study showed
Long-term altitude adaptation associates with enrichment of anaerobic and SCFA-producing taxa, whereas acute exposure promotes dysbiosis and intestinal barrier impairment. Metabolites such as SCFAs, bile acids, and succinic acid are proposed as mediators of immune homeostasis through TLR4/NF-κB pathways. The review also describes interorgan communication via gut-lung, gut-heart, gut-brain, gut-kidney, and gut-testis axes.
How it was done
Systematic narrative review consolidating evidence from studies on high-altitude natives, immigrant populations, short-term visitors, and relevant animal models.
Risk of bias
As a narrative review, it performs no quantitative synthesis and does not assess risk of bias of included primary studies. Population and altitude heterogeneity limits mechanistic generalization.
What this study does NOT prove
The review does not demonstrate causality between microbiota changes and clinical outcomes at altitude, nor efficacy of any microbiome-based intervention.
In clinical practice
There is insufficient basis for microbiota-targeted clinical interventions in high-altitude settings. Findings are descriptive and mechanistically speculative.
Limitations
As a narrative review, it performs no quantitative synthesis and does not assess risk of bias of included primary studies. Population and altitude heterogeneity limits mechanistic generalization.
Technical appendix
Version history
- 1.0 · 2026-07-22 — Auto-generated under Evidence Standard v1.0
Paid access: structured summary from public metadata; consult the original study at the source.