Observational studyThe Journal of nutrition2025
The Effect of Habitual Sleep Duration on Weight Loss during a Behavioral Weight Loss Intervention in a Mediterranean Population.
Observational study in The Journal of nutrition, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT02829619 (Meal Timing, Genetics and Weight Loss in a Mediterranean Population), which is not on this map. Cited by 1 paper.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Meal Timing, Genetics and Weight Loss in a Mediterranean Population
Who cites it
1 citing paper in PubMed.
- Optimal nap timing and body mass index: beyond duration.Journal of translational medicine · 2026Observational
Corrections and comments
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Authors and funding
4 authors.
Funding
Abstract
backgroundSleep duration affects metabolic health and regulates appetite, but its role in behavioral weight loss interventions remains unclear as prior studies are limited by small sample sizes, cross-sectional designs, and inconsistent findings.
objectivesThis study aims to examine the associations between nighttime sleep duration and weight loss during a behavioral intervention in adults with overweight or obesity in Spain.
methodsThis secondary analysis included adults with overweight or obesity from the Obesity, Nutrigenetics, Timing, and Mediterranean study, a 25-wk behavioral weight loss program. Participants self-reported sleep duration at enrollment and were categorized as short (<7 h), recommended (7-8 h), or long (>8 h) sleepers. Outcomes included percentage of weight loss, clinically meaningful or successful weight loss (≥5% of initial body weight), rate of weight loss (high/rapid rate ≥0.53 kg/wk), and attrition. Associations were examined using logistic regression and linear mixed-effects models adjusted for age, sex, baseline weight, intervention duration, and clinic site.
resultsAmong 3628 participants (mean age 41.2 ± 14.1 y; 77.6% women), 23.7% reported sleeping >8 h, 60.9% reported sleeping 7-8 h, and 15.4% reported sleeping <7 h per night. Long sleepers had significantly lower average weight loss (7.42% of baseline weight) compared with recommended sleepers (7.90%, P = 0.015). Long sleep was associated with 21% lower odds of achieving a weight loss ≥5% of baseline weight [odds ratio (OR): 0.79; 95% confidence interval (CI): 0.66, 0.96], 25% lower odds of rapid weight loss (OR: 0.75; 95% CI: 0.63, 0.89), and 21% higher odds of attrition (OR: 1.21; 95% CI: 1.03, 1.43) compared with recommended sleep. No significant associations were observed for short sleepers. Linear mixed-effects models indicated lower weight loss among long sleepers [β: 0.099; standard error (SE): 0.040; P = 0.015], but not for short sleepers (β: -0.031; SE: 0.048; P = 0.514).
conclusionsHabitual long sleep duration is associated with reduced weight loss success and increased risk of attrition in a behavioral weight loss intervention. This trial was registered at clinicaltrials.gov as NCT02829619.
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