Research
Mixed
Aging is associated with a decline in gut microbiota diversity, a decrease in beneficial butyrate-producing bacteria, and an increase in opportunistic pathogens, correlating with increased frailty and inflammation.
As you age, your gut bacteria change, often becoming less diverse and producing fewer beneficial compounds. This is linked to frailty. Maintaining a high-fiber diet and social engagement (if in care) may help preserve microbiota diversity.
GoodSupportsHIGH confidence
In general, the elderly microbiota has been characterised by a decline in microbial diversity, an increase in the abundance of opportunistic pathogens and a decrease in species associated with short chain fatty acid (SCFA) production, in particular butyrate [52].
Why this rating
Based on multiple observational studies linking microbiota changes to frailty.
Source
Precision Nutrition and the Microbiome, Part I: Current State of the Science
Susan Mills et al. · Nutrients · 2019
DOI 10.3390/nu11040923
narrative_reviewCited 386×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Short-chain fatty acids (SCFAs) like butyrate, produced by gut bacteria from dietary fiber, have anti-inflammatory, anti-cancer, and barrier-integrity functions, and their production declines with age and frailty.Strong
- Dietary composition (specifically carbohydrate vs. animal fat/protein intake) shapes gut microbiota enterotypes (Prevotella vs. Bacteroides dominance), which in turn influences host health outcomes including inflammation, metabolic disease risk, and immune function via microbial metabolite production.Good
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