Research
Mixed
Aging is associated with a significant decrease in the abundance of beneficial gut bacteria, particularly Bifidobacteria, and a reduction in the production of short-chain fatty acids (SCFAs) like butyrate, which contributes to gut inflammation and immune system decline.
As you age, your gut naturally loses some beneficial bacteria and produces fewer anti-inflammatory compounds. To counter this, prioritize fiber-rich plant-based diets and consider probiotics/prebiotics to support Bifidobacteria and SCFA production, helping to reduce inflammation and support immune health.
ModerateSupportsMEDIUM confidence
at old age, deterioration of physiological functions of the human body enforces the decrement in count of beneficial species (e.g. Bifidobacteria) in the gut microbiota... The level of SCFAs, especially acetate, butyrate, and propionate, in the intestine of aged people is reduced compared to young subjects.
Why this rating
Review paper citing multiple observational and animal studies; not a single clinical trial.
Source
Human gut microbiota and healthy aging: Recent developments and future prospective
Manish Kumar et al. · Nutrition and Healthy Aging · 2016
DOI 10.3233/nha-150002
narrative_reviewCited 191×
Read the paper DOI resolved against Crossref · corpus check 2026-06-10
More from this paper
- Plant-based, high-fiber diets promote the growth of beneficial bacteria (e.g., Prevotella, Faecalibacterium prausnitzii) that produce short-chain fatty acids (SCFAs) like butyrate, which reduces inflammation and protects against age-related diseases.Moderate
- Supplementation with prebiotics (e.g., inulin, FOS) and probiotics (e.g., Bifidobacteria) can increase the abundance of beneficial bacteria, reduce inflammation markers, and improve stool frequency in the elderly.Moderate
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