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The biological clock is involved in many aspects of regulating complex physiology in all animals. It was in 1935 when German zoologists, Hans Kalmus and Erwin Bünning, discovered the existence of circadian rhythm in Drosophila melanogaster. However, the internal molecular mechanisms behind the circadian clock remained a mystery until 1984, when Jeffrey C. Hall, Michael Rosbash, and Michael W. Young discovered the expression of the Per gene oscillating over a 24-hour cycle. In subsequent years,...
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Related Experiment Video

Updated: May 19, 2026

Manipulation of Rhythmic Food Intake in Mice Using a Custom-Made Feeding System
07:34

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Published on: December 16, 2022

Nutrition and the circadian timing system.

Dirk Jan Stenvers1, Cora F Jonkers2, Eric Fliers1

  • 1Department of Endocrinology and Metabolism, Academic Medical Center (AMC), University of Amsterdam, Amsterdam, The Netherlands.

Progress in Brain Research
|August 11, 2012
PubMed
Summary

The mammalian circadian timing system regulates food intake, digestion, and metabolism. Understanding this biological clock is crucial for improving human health and managing conditions like type 2 diabetes.

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Area of Science:

  • Chronobiology
  • Metabolic Physiology
  • Nutritional Science

Background:

  • Life on Earth is synchronized with daily light-dark cycles, influencing food availability and biological rhythms.
  • The mammalian circadian timing system involves a central clock in the suprachiasmatic nucleus (SCN) and peripheral clocks in metabolic tissues.
  • Peripheral clocks are synchronized by the SCN and metabolic signals, influencing bodily functions.

Purpose of the Study:

  • To review the mammalian circadian timing system and its influence on feeding behavior and metabolism.
  • To explore the implications of circadian control of digestion and metabolism for human health, including meal timing and nutritional support.
  • To examine the relationship between the circadian timing system and type 2 diabetes.

Main Methods:

  • Review of mammalian circadian timing system components and synchronization mechanisms.
  • Analysis of the influence of circadian rhythms on food intake, gastrointestinal activity, glucose, and lipid metabolism.
  • Examination of human literature on meal timing, frequency, breakfast consumption, and nutritional support.
  • Exploration of the link between circadian rhythms and type 2 diabetes.

Main Results:

  • The circadian timing system significantly impacts food intake, gastrointestinal function, and metabolic processes like glucose and lipid metabolism.
  • Meal timing, frequency, and breakfast consumption in humans are influenced by circadian rhythms, with potential health implications.
  • Disruptions in the circadian timing system are linked to metabolic disorders, including type 2 diabetes.

Conclusions:

  • The circadian timing system plays a vital role in regulating feeding behavior and energy metabolism.
  • Understanding the interplay between biological clocks and metabolism is essential for developing strategies to improve human health.
  • Further research is needed to fully elucidate the relationship between circadian rhythms and metabolic health, particularly in the context of type 2 diabetes and nutritional interventions.