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Updated: Jan 17, 2026

Using the Activity-based Anorexia Rodent Model to Study the Neurobiological Basis of Anorexia Nervosa
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Cholinergic network modulation in disinhibited eating behavior.

Swen Hesse1,2, Michael Rullmann3,4, Tilman Günnewig3,4

  • 1Department of Nuclear Medicine, University Medical Center Leipzig, University of Leipzig, Leipzig, Germany. swen.hesse@medizin.uni-leipzig.de.

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|September 17, 2025
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Summary
This summary is machine-generated.

Obesity is linked to increased nicotinic acetylcholine receptors (nAChR) in the brain

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Area of Science:

  • Neuroscience
  • Obesity Research
  • Neuroimaging

Background:

  • Cholinergic systems modulate brain reward pathways crucial for salience processing in obesity.
  • In vivo evidence of altered acetylcholine transmission in human obesity and abnormal eating behavior is lacking.

Purpose of the Study:

  • To investigate in vivo changes in nicotinic acetylcholine receptors (nAChR) availability and brain network activation in individuals with obesity compared to normal-weight controls.
  • To explore the relationship between nAChR availability, eating behavior, and brain activation patterns in response to food cues.

Main Methods:

  • Simultaneous positron emission tomography (PET) and functional magnetic resonance imaging (fMRI) were used.
  • Twenty individuals with obesity and sixteen normal-weight controls were studied.
  • Participants were exposed to visually salient food cues.

Main Results:

  • Individuals with obesity showed increased α4β2* nicotinic acetylcholine receptors (nAChR) availability in response to food cues, particularly those with high disinhibited eating.
  • Normal-weight controls showed no change in nAChR availability.
  • Brain activation shifted from the dorsal attention network in controls to the salience network in individuals with obesity.

Conclusions:

  • Increased α4β2* nAChR availability and altered network activation in response to food cues are observed in human obesity.
  • These findings suggest fundamental differences in sensory cue detection and reward processing in obesity.
  • Further research into α4β2* nAChR is warranted for potential weight loss treatments targeting hedonic overeating.