Profiling the human intestinal environment under physiological conditions.
Level 4 - case-series / case-control
Small observational physiological sampling study in healthy volunteers without a comparative clinical control group.
PubMed 37165188 · doi:10.1038/s41586-023-05989-7
What was done
Fifteen healthy individuals used an ingestible sampling device designed to collect samples across multiple regions of the human intestinal tract during normal digestion. A total of 240 intestinal samples were retrieved and analyzed using multi-omics approaches (bacteria, phages, host proteins, and metabolites) and compared directly against stool samples.
What was found
The abstract reports no exact numerical values or effect sizes. It reports qualitative differences between direct intestinal samples and stool: distinct enrichment of specific bacterial taxa, higher prevalence of prophage induction in the intestine, and significant differences in host proteomes and bile acid profiles. Intestinal bile acid gradients correlated with microbial deconjugation activity, and microbially conjugated bile acids showed amino acid-dependent patterns that were absent in stool.
Why it matters
Stool samples do not accurately capture the localized biochemistry and microbiology of the upper digestive tract. Ingestible sampling devices provide a non-invasive method to map regional human intestinal physiology and host-microbiome interactions under normal digestive conditions.
Limits
The sample size is very small (15 participants), limited exclusively to healthy individuals, and gives no insight into disease cohorts. The abstract provides no exact quantitative metrics, error estimates, or data regarding device recovery and spatial localization precision.
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