Gut microbiome of the Hadza hunter-gatherers.
Level 4 - case-series / case-control
Cross-sectional comparative observational study
PubMed 24736369 · doi:10.1038/ncomms4654
What was done
The authors analyzed the phylogenetic diversity and metabolite profiles of gut microbiota sampled from a community of Hadza hunter-gatherers in Tanzania and compared them to urban Italian controls and two rural farming African cohorts.
What was found
No numerical values, test statistics, or effect sizes were reported in the abstract. Qualitatively, the Hadza exhibited higher microbial richness and biodiversity compared to Italian urban controls. Compared to rural African farming groups and urban controls, the Hadza gut microbiome featured an absence of Bifidobacterium, differences in composition between sexes, an enrichment in Prevotella, Treponema, and unclassified Bacteroidetes, and a distinct configuration of Clostridiales taxa.
Why it matters
The study characterizes the gut microbiome of one of the few remaining traditional foraging populations, suggesting how human gut ecology may have functioned prior to agricultural and industrial lifestyle transitions.
Limits
Sample sizes, participant demographics, sequencing depth, and quantitative effect estimates are not provided in the abstract. As a cross-sectional observational comparison across geographically separated populations, the study cannot isolate diet from other environmental, genetic, or lifestyle confounders, nor prove causal metabolic mechanisms.
Cited by
- supports Indigenous hunter-gatherer populations can have a gut microbiome diversity that is tenfold higher than that of individuals living in modern industrialized societies.