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Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...
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Related Experiment Video

Updated: Apr 23, 2026

Control of Eating Behavior Using a Novel Feedback System
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Orexin-A controls sympathetic activity and eating behavior.

Giovanni Messina1, Carmine Dalia1, Domenico Tafuri2

  • 1Section of Human Physiology and Clinical Dietetic Service, Department of Experimental Medicine, Second University of Naples Naples, Italy.

Frontiers in Psychology
|September 25, 2014
PubMed
Summary

Understanding orexin-A

Keywords:
behaviorbody weightenergy expenditureorexin-Asympathetic nervous system

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Area of Science:

  • Neuroendocrinology
  • Metabolic regulation
  • Physiology

Background:

  • Energy expenditure regulation is crucial for health and body weight.
  • The hypothalamus integrates peripheral signals to control energy balance.
  • Orexin-A, a neuropeptide, influences feeding, sleep, and homeostasis.

Purpose of the Study:

  • To review the relationship between the sympathetic nervous system and orexin-A.
  • To explore orexin-A's role in controlling eating behavior and energy expenditure.
  • To analyze the thermoregulatory hypothesis of food intake.

Main Methods:

  • Literature review focusing on orexin-A and sympathetic nervous system interactions.
  • Analysis of existing research on orexin-A's effects on feeding and metabolism.
  • Examination of the thermoregulatory hypothesis in relation to orexin-A.

Main Results:

  • Orexin-A modulates sympathetic activation, impacting metabolic status.
  • Orexin-A plays a role in regulating food intake, particularly concerning body temperature.
  • Paradoxical eating behaviors induced by orexin-A are highlighted.

Conclusions:

  • Orexin-A is a key player in the sympathetic control of energy expenditure and feeding.
  • The neuropeptide's influence on thermoregulation is central to its role in appetite.
  • Further research into orexin-A mechanisms can inform body weight management strategies.