Cited by 796Circadian rhythm and melatoninImpact of Light on Environment and HealthSleep and Work-Related Fatigue

Light at night increases body mass by shifting the time of food intake

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Fonken, Laura K., Workman, Joanna L., Walton, James C., Weil, Zachary M., Morris, John S., Haim, Abraham, Nelson, Randy J.·2010·Proceedings of the National Academy of Sciences

Abstract

The global increase in the prevalence of obesity and metabolic disorders coincides with the increase of exposure to light at night (LAN) and shift work. Circadian regulation of energy homeostasis is controlled by an endogenous biological clock that is synchronized by light information. To promote optimal adaptive functioning, the circadian clock prepares individuals for predictable events such as food availability and sleep, and disruption of clock function causes circadian and metabolic disturbances. To determine whether a causal relationship exists between nighttime light exposure and obesity, we examined the effects of LAN on body mass in male mice. Mice housed in either bright (LL) or dim (DM) LAN have significantly increased body mass and reduced glucose tolerance compared with mice in a standard (LD) light/dark cycle, despite equivalent levels of caloric intake and total daily activity output. Furthermore, the timing of food consumption by DM and LL mice differs from that in LD mice. Nocturnal rodents typically eat substantially more food at night; however, DM mice consume 55.5% of their food during the light phase, as compared with 36.5% in LD mice. Restricting food consumption to the active phase in DM mice prevents body mass gain. These results suggest that low levels of light at night disrupt the timing of food intake and other metabolic signals, leading to excess weight gain. These data are relevant to the coincidence between increasing use of light at night and obesity in humans.

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  • Light at night and the corresponding longer active compared to rest phase intervals have led to an increase in food intake and excessive weight gain, as shown in rodent studies.

    “light at night and the corresponding longer active compared to rest phase intervals have led to an increase in food intake and therefore excessive weight gain, as shown in rodent studies (56).”

    From Meal timing and its role in obesity and associated diseases (2024) · cites this paper as [56]

    The paper reports weight gain in mice exposed to light at night, but its Energy intake results state that total 24-hour food consumption did not differ among groups. The Discussion attributes the gain to a shift in when mice ate, not to increased overall intake; it also reports similar total daily activity across groups, rather than establishing longer active intervals. (LLM, conf=0.90)

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  • Exposing mice to light (150 lux of continuous light or 16:8 150/5 lux cycle) during the habitual dark phase significantly increases body and fat mass and impairs glucose tolerance.

    “Exposing mice to light (150 lux of continues light or 16:8 150/5 lux cycle) during the habitual dark phase significantly increases body and fat mass and impairs glucose tolerance (Fonken et al., 2010).”

    From The impact of the circadian timing system on cardiovascular and metabolic function (2012) · cites this paper as Fonken et al., 2010

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Authors
Fonken, L. K., Workman, J. L., Walton, J. C., Weil, Z. M., Morris, J. S., Haim, A., & Nelson, R. J.
Affiliations
  • The Ohio State University (US)
  • University of Haifa (IL)
Venue
Proceedings of the National Academy of Sciences
Published
2010-10-11
Volume
107
Issue
43
Pages
18664-18669
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2049317326
Cited by
796
References
41
Citations by year
2026: 28 · 2025: 42 · 2024: 46 · 2023: 68 · 2022: 57 · 2021: 69 · 2020: 59 · 2019: 59 · 2018: 52 · 2017: 57 · 2016: 46 · 2015: 49 · 2014: 55 · 2013: 53 · 2012: 31
FWCI
15.68
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
  • National Science Foundation
  • United States-Israel Binational Science Foundation
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Circadian rhythm and melatonin
  • Physical Sciences › Environmental Science › Global and Planetary Change › Impact of Light on Environment and Health
  • Social Sciences › Psychology › Experimental and Cognitive Psychology › Sleep and Work-Related Fatigue
Keywords
light at night, circadian rhythm, meal timing, weight gain, obesity, glucose tolerance, circadian clock, metabolic disorders, shift work, light exposure, nocturnal feeding
MeSH terms
Animals, Energy Intake, Circadian Rhythm, Disease Models, Animal, Eating, Feeding Behavior, Glucose Tolerance Test, Humans, Male, Motor Activity, Obesity, Body Mass Index, Photoperiod, Metabolic Syndrome, Mice

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