Night work showed health associations in both morning and evening types
A review examined whether morning or evening preference changed links between shift work, cancer, and mental health. Associations appeared in both chronotype groups.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Both morning-type and evening-type night workers had higher odds of breast cancer and poor mental health than daytime workers. Evening-type night workers also showed an association with prostate cancer. These observational findings do not demonstrate that matching shifts to someone's preferred sleep timing prevents harm, or that chronotype itself causes the reported differences.
This abstract-based account lacks study follow-up periods and details of adjustment for other risk factors. The observational comparisons do not establish whether matching work schedules to chronotype would protect health.
Longer exposure was also examined
Among evening types working nights, longer exposure to night shifts was associated with greater prostate cancer risk. This pattern concerns years of exposure and does not by itself establish causation.
A missing outcome
The review also included diabetes studies, yet the abstract gives no diabetes result. Its conclusions about chronotype should therefore not be extended to a specific diabetes effect from this summary.
The original publication
Chronotype differences in the risk of cancers, diabetes mellitus, and poor mental health among shift workers: a meta-analysis.
Li B, Wang F, Tang NHY et al.
Scand J Work Environ Health · 2026
- PubMed ID
- 41498222
- Record checked
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