Trial reportPloS one2014
Timing and intensity of light correlate with body weight in adults.
Trial report in PloS one, 2014. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to 2 registered trials, which are not on this map. Cited by 60 papers, 1 of them a synthesis that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
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.
Circadian Rhythms and Sleep in Familial Delayed Sleep Phase Syndrome (DSPS) and Advanced Sleep Phase Syndrome (ASPS)
Impact of Sleep Restriction on Cardiometabolic Risk Factors in Pre vs Postmenopausal Women
Who cites it
60 citing papers in PubMed, 1 synthesis or guideline pooled it.
- A systematic review of the amount and timing of light in association with objective and subjective sleep outcomes in community-dwelling adults.Sleep health · 2019Pooled it
- Greater Adherence to Recommended Morning Physical Activity is Associated With Greater Total Intervention-Related Physical Activity Changes in Bariatric Surgery Patients.Journal of physical activity & health · 2017Trial
- Acute Effects of Morning Light on Plasma Glucose and Triglycerides in Healthy Men and Men with Type 2 Diabetes.Journal of biological rhythms · 2017Trial
- Blunted light exposure amplitudes in patients with opioid use disorder.Npj biological timing and sleep · 2026Article
- Beyond composite scores in chronotype assessment: item-level predictive patterns in the Morningness-Eveningness Questionnaire.Scientific reports · 2026Observational
- Bright light exposure suppresses feeding and weight gain via a visual circuit linked to the lateral hypothalamus.Nature neuroscience · 2026Article
- Too noisy, too dark: sleep environment at a typical stroke unit.European stroke journal · 2026Article
- Goal-directed human factor experiment on the non-visual effect of luminous environment on indoor exercise.Scientific reports · 2026Article
- Collecting, detecting, and handling non-wear intervals in longitudinal light exposure data.Behavior research methods · 2026Article
- The Link Between Dietary Timing and Exercise Performance Through Adipocyte AMPKα2 Signaling.International journal of molecular sciences · 2025Review
- Characteristics of objectively-measured naturalistic light exposure patterns in U.S. adults: A cross-sectional analysis of two cohorts.The Science of the total environment · 2025Article
- Wearables in Chronomedicine and Interpretation of Circadian Health.Diagnostics (Basel, Switzerland) · 2025Review
- Unveiling the Hierarchical Network of Sleep Quality Determinants: Linking Behavioral, Environmental, and Psychosocial Pathways.Psychology research and behavior management · 2025Article
- Protocol for a prospective, multicentre, cross-sectional cohort study to assess personal light exposure.BMC public health · 2024Article
- Morning physical activity may be more beneficial for blood lipids than afternoon physical activity in older adults: a cross-sectional study.European journal of applied physiology · 2024Article
- Brighter nights and darker days predict higher mortality risk: A prospective analysis of personal light exposure in >88,000 individuals.Proceedings of the National Academy of Sciences of the United States of America · 2024Article
- Article
- Light exposure differs by sex in the US, with females receiving less bright light.Npj biological timing and sleep · 2024Article
- Blue Light and Temperature Actigraphy Measures Predicting Metabolic Health Are Linked to Melatonin Receptor Polymorphism.Biology · 2023Article
- Integrative Lighting Aimed at Patients with Psychiatric and Neurological Disorders.Clocks & sleep · 2023Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
6 authors.
Funding
Abstract
Light exposure can influence sleep and circadian timing, both of which have been shown to influence weight regulation. The goal of this study was to evaluate the relationship between ambient light, sleep and body mass index. Participants included 54 individuals (26 males, mean age 30.6, SD = 11.7 years). Light levels, sleep midpoint and duration were measured with wrist actigraphy (Actiwatch-L) for 7 days. BMI was derived from self-reported height and weight. Caloric intake was determined from 7 days of food logs. For each participant, light and activity data were output in 2 minute epochs, smoothed using a 5 point (10 minute) moving average and then aggregated over 24 hours. The mean light timing above 500 lux (MLiT500) was defined as the average clock time of all aggregated data points above 500 lux. MLiT500 was positively correlated with BMI (r = 0.51, p<0.001), and midpoint of sleep (r = 0.47, p<0.01). In a multivariable linear regression model including MLiT500 and midpoint of sleep, MLiT500 was a significant predictor of BMI (B = 1.26 SE = 0.34, β = 0.53 p = 0.001, r2Δ = 0.22). Adjusting for covariates, MLiT500 remained an independent predictor of BMI (B = 1.28 SE = 0.36, β = 0.54, p = 0.002, r2Δ = 0.20). The full model accounted for 34.7% of the variance in BMI (p = 0.01). Exposure to moderate levels of light at biologically appropriate times can influence weight, independent of sleep timing and duration.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.