The Study
The Effectiveness of Time-Restricted Eating as an Intermittent Fasting Approach on Shift Workers’ Glucose Metabolism: A Systematic Review and Meta-Analysis
This study looked at lots of small experiments where people tried eating only during the day, but the results were all over the place—sometimes glucose went down a little, sometimes it didn’t. We can’t say for sure if it helps because the studies were too small and messy.
Analysis score
Maximum 100 for a systematic review with meta-analysis.
Where the score came from
Scientists looked at six small studies where night workers tried eating only during the day and fasting at night to see if it helped their blood sugar and sleep.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 560 / 100
Quality score
The highest quality evidence. Systematic reviews and meta-analyses that pool randomized controlled trials, giving the most reliable summary of experimental evidence.
Key takeaways
Summary
Based on the study abstract and findings.
- 1The changes were so small and uncertain that they don't mean anything practical for night workers — it's like flipping a coin and getting slightly more heads, but not enough to say the coin is rigged.
- 2Blood sugar and insulin didn't change much — the differences were tiny and could be due to chance.
- 3Sleep didn't get better either.
- 4Only one study had a long enough fast (14 hours); others were shorter.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Nutrients
Year
2025
Authors
Jia Ying Jennell Koh, Celine Yu Han Tan, Meng Li, M. Liu, H. S. J. Chew
Related Content
Claims (5)
The meta-analysis primarily included studies that used nighttime fasting, not time-restricted eating with a 6–10 hour eating window, so it cannot be used to determine the effects of time-restricted eating specifically.
In shift workers, eating within a restricted daily window did not change the total amount of sleep or the quality of sleep.
In shift workers, time-restricted eating did not produce a statistically significant change in fasting blood glucose, fasting insulin, HOMA-IR, or 2-hour postprandial glucose levels.
Current scientific evidence on how time-restricted eating affects glucose metabolism in shift workers is considered very uncertain because of methodological flaws, inconsistent results, small study sizes, and possible selective reporting, making it impossible to draw reliable conclusions.
Most studies used fasting periods shorter than 14 hours, and these shorter durations did not trigger metabolic changes like ketosis or circadian rhythm shifts.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.