Gut-to-brain signals in feeding control

Area of Science:

• Neuroscience
• Physiology
• Behavioral Science

Background:

• Feeding behavior and body weight are regulated by integrating internal (interoceptive) and external (sensory) cues.
• The brain's neural circuits process these signals to maintain homeostatic control.

Purpose of the Study:

• To describe mechanisms of gastrointestinal nutrient stimulation and signal transduction to the brain.
• To explore how these signals influence hindbrain activity and motivated feeding behaviors.
• To examine the organization of neural circuits controlling feeding.

Main Methods:

• In vivo neural recordings to observe hunger neuron activity.
• Analysis of recent technical developments in tracking peripheral and sensory signals.
• Review of neuroanatomical circuits involved in feeding regulation.

Main Results:

• Interoceptive and sensory signals modulate multiple layers of hunger neurons.
• Eating behavior involves both feedback correction and anticipatory regulation.
• Nutrient signals from the gut are conveyed to the brain via specific neural pathways.

Conclusions:

• Understanding the neural control of feeding requires integrating information on peripheral signaling and central circuit organization.
• Multidirectional hypothalamic circuits provide a framework for comprehending feeding regulation.
• Advances in technology are crucial for elucidating the neural basis of motivated behaviors like feeding.