Cited by 523Circadian rhythm and melatoninSleep and Work-Related FatiguePancreatic function and diabetes

Endogenous circadian system and circadian misalignment impact glucose tolerance via separate mechanisms in humans

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Morris, Christopher J., Yang, Jessica N., Garcia, Joanna I., Myers, Samantha, Bozzi, Isadora, Wang, Wei, Buxton, Orfeu M., Shea, Steven A. +1 more·2015·Proceedings of the National Academy of Sciences

Abstract

Glucose tolerance is lower in the evening and at night than in the morning. However, the relative contribution of the circadian system vs. the behavioral cycle (including the sleep/wake and fasting/feeding cycles) is unclear. Furthermore, although shift work is a diabetes risk factor, the separate impact on glucose tolerance of the behavioral cycle, circadian phase, and circadian disruption (i.e., misalignment between the central circadian pacemaker and the behavioral cycle) has not been systematically studied. Here we show--by using two 8-d laboratory protocols--in healthy adults that the circadian system and circadian misalignment have distinct influences on glucose tolerance, both separate from the behavioral cycle. First, postprandial glucose was 17% higher (i.e., lower glucose tolerance) in the biological evening (8:00 PM) than morning (8:00 AM; i.e., a circadian phase effect), independent of the behavioral cycle effect. Second, circadian misalignment itself (12-h behavioral cycle inversion) increased postprandial glucose by 6%. Third, these variations in glucose tolerance appeared to be explained, at least in part, by different mechanisms: during the biological evening by decreased pancreatic β-cell function (27% lower early-phase insulin) and during circadian misalignment presumably by decreased insulin sensitivity (elevated postprandial glucose despite 14% higher late-phase insulin) without change in early-phase insulin. We explored possible contributing factors, including changes in polysomnographic sleep and 24-h hormonal profiles. We demonstrate that the circadian system importantly contributes to the reduced glucose tolerance observed in the evening compared with the morning. Separately, circadian misalignment reduces glucose tolerance, providing a mechanism to help explain the increased diabetes risk in shift workers.

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Crossref · 10.1073/pnas.1418955112

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Authors
Morris, C. J., Yang, J. N., Garcia, J. I., Myers, S., Bozzi, I., Wang, W., Buxton, O. M., Shea, S. A., & Scheer, F. A. J. L.
Affiliations
Brigham and Women's Hospital (US)
Venue
Proceedings of the National Academy of Sciences
Published
2015-04-13
Volume
112
Issue
17
Pages
E2225-34
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2081139788
Cited by
523
References
67
Citations by year
2026: 77 · 2025: 58 · 2024: 53 · 2023: 45 · 2022: 48 · 2021: 52 · 2020: 48 · 2019: 36 · 2018: 34 · 2017: 33 · 2016: 26 · 2015: 13
FWCI
19.33
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • HHS | NIH | National Heart, Lung, and Blood Institute (HL094806, HL118601, HL076446)
  • National Aeronautics and Space Administration (NCC 9-58)
  • HHS | NIH | National Institute on Aging (P01 AG009975)
  • HHS | NIH | National Institute of Diabetes and Digestive and Kidney Diseases (DK099512)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
Keywords
circadian misalignment, circadian system, glucose tolerance, postprandial blood glucose, circadian phase, shift work, diabetes risk, beta-cell function, insulin sensitivity, sleep
MeSH terms
Adult, Blood Glucose, Circadian Rhythm, Diabetes Mellitus, Female, Glucose Tolerance Test, Humans, Male, Middle Aged, Sleep, Postprandial Period, Insulin-Secreting Cells

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