Nutritional neuroscience

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

Circadian Biology Weekly Brief ↗PubMed ↗DOI ↗

Updated

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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