Shift work was associated with gut-microbe differences in a small evidence base
A systematic review linked night work with lower gut microbial diversity and altered bacterial patterns, but could not draw firm causal conclusions.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Night shift work was associated with lower gut microbial diversity and changes in the relative abundance of several bacterial groups. These patterns also tracked gastrointestinal complaints and markers of cardiometabolic dysfunction. The review cannot establish that shift work caused the microbial changes or that those changes caused disease, because the evidence was limited and heterogeneous.
The abstract describes small observational studies and heterogeneous evidence. The genetic analysis was preliminary, so it does not resolve uncertainty about cause and effect.
What the studies observed
The observational studies reported less diversity within gut microbial communities and higher relative abundance of several genera described as pro-inflammatory. These are findings about microbiota composition, not direct proof of inflammation or a specific disease outcome.
What the genetic study adds
The genetic analysis explored relationships among disrupted daily rhythms, altered gut microbiota and cardiovascular risk. Its preliminary findings offered another line of evidence, but the review still concluded that firm causal claims were not justified.
The original publication
Disrupted Rhythms, Disrupted Microbes: A Systematic Review of Shift Work and Gut Microbiota Alterations.
Grasa-Ciria D, Couto S, Samatán E et al.
Nutrients · 2025
- PubMed ID
- 40944282
- Record checked
AI-assisted research and writing. This explains one selected publication; it is not a complete review of everything known. Our approach.
One more question, understood.
Keep track of the research you’ve explored.