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Updated: Aug 20, 2025

An In Vitro Batch-culture Model to Estimate the Effects of Interventional Regimens on Human Fecal Microbiota
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Diet standardization reduces intra-individual microbiome variation.

Clara Delaroque1, Gary D Wu2, Charlene Compher3

  • 1INSERM U1016, Team "Mucosal Microbiota in Chronic Inflammatory Diseases", CNRS UMR 8104, Université Paris Cité, Paris, France.

Gut Microbes
|November 25, 2022
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Summary
This summary is machine-generated.

Diet variation significantly impacts gut microbiota composition daily. Standardizing diets reduced this intra-individual variation, revealing individual microbial responses and a potential decrease in pro-inflammatory markers.

Keywords:
Intestinal microbiotadietmicrobiota stability

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Area of Science:

  • Microbiome research
  • Human gut microbiome
  • Dietary impact on microbiota

Background:

  • The human gut microbiota is complex and varies significantly between individuals and daily within individuals.
  • Diet is a major factor influencing gut microbial composition, but the extent of its impact on daily variation is not fully understood.

Purpose of the Study:

  • To investigate how diet normalization affects the heterogeneity of the human gut microbiota.
  • To determine if standardizing diet reduces day-to-day variations in gut microbial composition and associated inflammatory markers.

Main Methods:

  • Analysis of fecal microbiota composition from nine healthy individuals consuming a standardized diet for 10 days.
  • Assessment of inter-individual and intra-individual variations in microbial taxa.
  • Measurement of fecal lipopolysaccharide (LPS) and flagellin levels to gauge pro-inflammatory potential.

Main Results:

  • Diet normalization did not alter inter-individual microbiota differences.
  • A significant reduction in intra-individual, day-to-day variation of fecal microbiota composition was observed.
  • Decreased heterogeneity correlated with individual-specific microbial taxa shifts and a trend towards reduced pro-inflammatory markers (LPS, flagellin).
  • Some individuals showed stable microbiota, suggesting resilience or similar baseline diets.

Conclusions:

  • Short-term dietary variations contribute to daily fluctuations in gut microbiota composition within individuals.
  • Standardized diets can reduce gut microbiota heterogeneity, highlighting individual microbial responses to dietary changes.
  • Further research is needed to understand microbiota resilience to dietary interventions.