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[Lipogenesis, lipolysis and feeding rhythms].

J Le Magnen1

  • 1Collège de France, Paris.

Annales D'Endocrinologie
|January 1, 1988
PubMed
Summary

Analyzing rat feeding rhythms reveals diurnal cycles in energy balance, fat storage, and hormone levels. These findings offer insights into the regulation of food intake and obesity mechanisms.

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Area of Science:

  • Physiology
  • Endocrinology
  • Chronobiology

Context:

  • Understanding the regulation of food intake is crucial for addressing metabolic disorders.
  • Diurnal feeding patterns and energy balance are key factors in maintaining metabolic homeostasis.
  • Previous research has indicated a link between feeding rhythms and energy metabolism.

Purpose:

  • To investigate the diurnal feeding patterns in rats and their relationship to energy balance and metabolic regulation.
  • To explore the neuroendocrine mechanisms underlying diurnal lipogenesis and lipolysis cycles.
  • To correlate feeding rhythms with hormonal changes and glucose metabolism.

Summary:

  • Simultaneous recordings of feeding patterns and respiratory exchanges in rats revealed nocturnal hyperphagia and positive energy balance, primarily due to nutrient diversion to fat deposition.
  • Daytime hypophagia and negative energy balance were associated with fat mobilization and oxidation.
  • A diurnal neuroendocrine cycle, characterized by nocturnal hyperinsulinism and daytime hypoinsulinism, underlies the lipogenesis-lipolysis cycle, influencing glucose tolerance and metabolism.

Impact:

  • This study provides evidence for a lipostatic mechanism regulated by hypothalamic ventromedial nuclei, influencing obesity and seasonal cycles.
  • Findings suggest that diurnal feeding rhythms and associated metabolic shifts play a significant role in energy homeostasis.
  • The research offers potential targets for understanding and managing human feeding behaviors and metabolic health.

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