Constant light induces alterations in melatonin levels, food intake, feed efficiency, visceral adiposity, and circadian rhythms in rats

Sep 19, 2009Nutritional neuroscience

Constant light changes melatonin, eating habits, fat storage, and daily rhythms in rats

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Circadian BiologyCircadian Biology on OpenScience ↗PubMed ↗DOI ↗

Abstract

LL animals had lower melatonin levels in the subjective dark compared to LD and DD animals.

  • Animals exposed to continuous light (LL) showed decreased melatonin levels and altered metabolic parameters.
  • Food and water intake were lower in LL animals, while feed efficiency was more positive compared to those in light/dark (LD) and continuous dark (DD) conditions.
  • LL animals exhibited increased visceral fat compared to LD and DD animals.
  • Circadian activity patterns in LL animals became free-running, along with a decrease in overall activity levels.
  • Behavioral changes in LL animals included increased irritability and excitability.

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