The Study
Post-intervention sustainability of time-restricted eating versus caloric restriction: a secondary analysis
This study watches what happened to people after they finished a diet program, but doesn’t control what they did next. It can tell us what people reported doing and how they felt, but it can’t prove that one diet caused better results than the other.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
Researchers asked people who tried either an 8‑hour eating window or a 15% calorie cut to keep doing it for up to six months and see what happened to their weight and how they felt.
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 558 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1For a person trying to lose weight, the time‑window method kept weight steady, while the calorie‑cut gave a short‑term drop that didn’t last.
- 2Both groups kept about half of the people doing the diet after six months.
- 3The time‑window group didn’t lose or gain weight.
- 4The calorie‑cut group lost about 1.6 kg after one month but went back to their original weight by three months.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
International Journal of Obesity (2005)
Year
2025
Authors
De-An Chen, Raul Herrera Pena, Niki Oldenburg, Qi Wang, Erika Helgeson, Brad P. Yentzer, A. Taddese, Nicole LaPage, Emily N. C. Manoogian, S. Panda, Lisa S. Chow
Related Content
Claims (8)
About half of the people who finished a 12-week diet program were still sticking to their diet plan six months later, whether it was eating within a certain time window or cutting calories.
People with obesity who tried time-restricted eating kept their weight steady after finishing the program, but those who cut calories lost about 1.6 kilos a month later—though they gained it back within three months.
People stuck with time-restricted eating and calorie cutting about the same amount after their supervised program ended — neither one was clearly better for long-term follow-through.
People who keep eating only within a set time window say they sleep better, feel more energetic during the day, and have happier digestion, but they also notice they get hungry in the morning and find it hard to fit the eating schedule into work or family life.
People staying on a low‑calorie diet say they’re more aware of what they eat and portion sizes, yet they also feel anxious about counting food, get stronger cravings, and sometimes binge eat.
Some people find it easier to stick to time-restricted eating — like only eating during an 8-hour window — than to cutting calories every day.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.