Successful weight loss maintenance associated with morning chronotype and better sleep quality
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It is not known whether individuals successful at long term weight loss maintenance differ in chronotype (i.e., being a “morning” or “evening” person) or sleep habits compared to those who are overweight and obese. We compared Morningness–Eveningness Questionnaire (MEQ) and Pittsburgh Sleep Quality Index scores of 690 National Weight Control Registry (NWCR) members (73 % female, 93 % white, age = 51.7 ± 12.5, BMI = 26.4 ± 5.1) to 75 enrollees in two behavioral weight loss interventions (INT; 77 % female, 88 % white, age = 55.7 ± 10.4, BMI = 36.2 ± 4.7). Controlling for age, MEQ scores were higher in NWCR than INT, p = .004, such that more NWCR than INT were morning-types and fewer were evening types, p = .014. Further, NWCR participants reported better sleep quality, longer sleep duration, and shorter latency to sleep onset compared to INT, ps < .05, and fewer NWCR participants reported <6 or <7 h of sleep, ps < .01. Future studies should examine if these factors change as a result of weight loss or are predictors of weight outcome.
KeywordsObesity Weight loss maintenance Sleep Chronotype Morningness/eveningness
This study was funded by the National Cancer Institute (National Institutes of Health) under award number 5U01CA150387 awarded to RRW, and by the National Institute of Diabetes Digestive and Kidney Diseases (National Institutes of Health) under award number F32DK100069 awarded to KMR. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
Compliance with ethical standards
Conflict of interest
Kathryn M. Ross, J. Graham Thomas and Rena R. Wing declare that they have no conflict of interest.
Human and animal rights and Informed consent
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
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