The Study
Intended isocaloric time-restricted eating shifts circadian clocks but does not improve cardiometabolic health in women with overweight.
This study is like a fair test where two groups of women ate at different times, but ate the exact same amount of food. It found that changing when they ate didn't make their blood sugar or heart health better — but it did change their body clocks. So we can say eating time affects body clocks, but not that it fixes metabolism unless you eat less.
Analysis score
Maximum 90 for a randomized controlled trial.
Where the score came from
Scientists tested if eating only during the day (like 8am–4pm) makes your body healthier — even if you eat the same amount of food. They compared it to eating later (1pm–9pm).
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 575 / 100
Quality score
Participants are randomly assigned to treatment or control groups, minimizing bias. The gold standard for testing whether an intervention causes an effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1The weight loss was small and likely from accidentally eating less, not from timing.
- 2The sleep benefit is real, but metabolic health didn’t change — meaning timing alone doesn’t fix insulin or fat metabolism.
- 3Eating early led to a tiny calorie drop (167 kcal/day) and more weight loss (1.08 kg vs.
- 40.44 kg).
- 5But blood sugar, insulin, and cholesterol didn’t improve.
- 6Sleep happened 15 minutes earlier with early eating.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Science translational medicine
Year
2025
Authors
Beeke Peters, J. Schwarz, B. Schuppelius, A. Ottawa, D. Koppold, D. Weber, N. Steckhan, K. Mai, Tilman Grune, A. F. H. Pfeiffer, Andreas Michalsen, A. Kramer, O. Pivovarova-Ramich
Related Content
Claims (10)
In women with overweight or obesity, changing the time window for eating from morning to evening, without reducing calories, does not improve insulin sensitivity, blood sugar levels, cholesterol, or inflammation markers over two weeks, even when eating is closely followed and some weight is lost.
In women with overweight or obesity, eating later in the day shifts the daily rhythm of immune cells in the blood by 24 minutes and moves the midpoint of sleep earlier by 15 minutes, showing that when meals are eaten directly influences internal biological clocks and sleep timing without changes in metabolism.
In women with overweight, eating meals earlier or later in the day has no measurable effect on blood glucose, lipid levels, or oxidative stress markers over 24 hours when total calorie intake is held constant.
Women with overweight or obesity who eat only between 8:00 and 16:00 lose more weight than those who eat between 13:00 and 21:00, even when both groups consume the same number of calories, because the early eating group consumes 167 fewer calories per day on average.
In women with overweight or obesity, eating later in the day shifts the daily rhythm of immune cells in the blood by 24 minutes and moves the midpoint of sleep forward by 15 minutes, showing that when meals are eaten can directly influence circadian rhythms and sleep timing without changes in metabolism.
Women with overweight or obesity who eat only between 8 a.m. and 4 p.m. go to sleep 15 minutes earlier on average than those who eat between 1 p.m. and 9 p.m., regardless of changes in metabolism.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.