Chrononutrition and Gut Health: Exploring the Relationship Between Meal Timing and the Gut Microbiome.
Level 5 - mechanism / opinion, no new human data
Narrative literature review synthesizing 31 heterogeneous preclinical and human studies
PubMed 40488812 · doi:10.1007/s13668-025-00670-z
What was done
The authors reviewed 31 peer-reviewed publications from the past decade retrieved from PubMed, Google Scholar, and Scopus to evaluate how circadian rhythm disturbances and meal timing variations affect gut microbiota composition, intestinal barrier integrity, and metabolic outcomes.
What was found
The abstract reports no numerical values or effect sizes. Qualitatively, circadian misalignment from shift work, irregular eating, or social jet lag is reported to alter lipid metabolism, reduce short-chain fatty acid synthesis, and disrupt microbial rhythms. Irregular meal timing is linked to tight junction protein changes that increase intestinal permeability and inflammation, while early time-restricted feeding is reported to enhance microbial diversity and function.
Why it matters
This review highlights chrononutrition and early time-restricted feeding as potential non-pharmacological strategies to support gut barrier integrity and microbiome balance. It emphasizes the bidirectional relationship between host circadian rhythms and gut microbes.
Limits
The abstract reports no quantitative results, effect sizes, or participant numbers. It summarizes 31 studies without detailed systematic review protocols, risk-of-bias evaluation, or differentiation between animal models and human clinical trials. Specific dietary composition and long-term outcomes were not reported.
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