The Neurobiology of Hunger: Clinical Implications for Psychiatry
In this video, Dr Sanil Rege, consultant psychiatrist, examines the neurobiology of hunger through a contemporary psychiatric lens, drawing on a New England Journal of Medicine review to reframe appetite as a complex brain-gut-microbiome system rather than a matter of willpower. He outlines three interacting hunger systems – homeostatic, hedonic, and microbiota-driven- and explores how each manifests in clinical practice.
The discussion links these mechanisms to obesity, metabolic syndrome, anorexia nervosa, and binge-eating presentations, while also addressing medication-related appetite changes and the cautious use of GLP-1 receptor agonists, particularly in adolescents. This framework supports more nuanced diagnostic formulation, patient psychoeducation, and treatment planning when appetite dysregulation complicates psychiatric care.
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KEY TAKEAWAYS
- Hunger is regulated by multiple interacting systems, not a single energy-balance mechanism.
- Homeostatic hunger reflects physiological energy needs mediated by gut–hypothalamic signalling.
- Hedonic hunger is driven by reward, emotion, learning, and environmental cues, independent of caloric need.
- Gut microbiota and their metabolites can influence appetite via hormonal and neural pathways.
- Differentiating the dominant hunger system can inform formulation and reduce stigma in clinical discussions.
- Appetite-modifying treatments, including GLP-1 receptor agonists, require a developmental and psychiatric context.
To build on the neurobiological and clinical concepts discussed in this video, clinicians may find value in the Antipsychotic-Induced Weight Gain and Metabolic Syndrome (MetS) course on The Academy by Psych Scene. This curriculum provides a detailed exploration of the mechanisms underlying metabolic dysfunction in psychiatric practice and practical strategies to mitigate weight gain and cardiometabolic risk associated with psychotropic medications.
The Psychopharmacology Masterclass Series further complements this content by examining core neurobiological mechanisms across major psychiatric disorders and linking symptom profiles with evidence-based psychopharmacological strategies. This series supports clinicians in understanding how medications interact with neural circuits and metabolic systems, enhancing safe prescribing and long-term management.
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- Understanding and Managing Weight Gain and Obesity in Psychiatry: Pharmacological Approaches
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