Timing and intensity of light correlate with body weight in adults

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 ye...

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Bibliographic Details
Published in:PloS one 2014-04, Vol.9 (4), p.e92251-e92251
Main Authors: Reid, Kathryn J, Santostasi, Giovanni, Baron, Kelly G, Wilson, John, Kang, Joseph, Zee, Phyllis C
Format: Article
Language:English
Subjects:
Adult
Adults
Analysis
Appetite
Biology and Life Sciences
Body fat
Body mass
Body Mass Index
Body size
Body weight
Circadian Rhythm - physiology
Circadian rhythms
Data points
Diabetes
Diet
Energy Intake - physiology
Exposure
Female
Food
Health care
Humans
Light
Light levels
Lighting
Luminous intensity
Male
Males
Medicine
Medicine and Health Sciences
Melatonin
Metabolism
Models, Biological
Neurology
Physiological aspects
Regression models
Rodents
Sleep
Sleep - physiology
Studies
Time Factors
Weight reduction
Wrist
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Summary: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
ISSN:1932-6203
1932-6203
DOI:10.1371/journal.pone.0092251