Antidepressant Mechanisms and Weight Management
Summary
Antidepressant therapies modulate monoaminergic neurotransmission, principally via serotonin, noradrenaline and dopamine pathways. Classes include selective serotonin reuptake inhibitors (SSRIs), serotonin–noradrenaline reuptake inhibitors (SNRIs) and tricyclic antidepressants (TCAs), each differing in receptor affinities and side-effect profiles. Weight change emerges as a clinically salient outcome, reflecting alterations in appetite control, basal metabolic rate, insulin sensitivity and adipose tissue distribution. Acute SSRI exposure often provokes transient weight loss through appetite suppression and enhanced energy expenditure, whereas chronic treatment may lead to progressive weight gain, potentially via compensatory hyperphagia and adaptive metabolic shifts. The 5-HT2C receptor has been identified as a critical nexus for feeding circuits and energy homeostasis, offering a target to mitigate treatment-related adiposity. In the context of rising rates of obesity and type 2 diabetes, these interactions carry global significance and demand personalised approaches that balance mood stabilisation with metabolic health.
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Antidepressant Mechanisms and Weight Management publication trend
The graph below shows the total number of articles in antidepressant mechanisms and weight management across all publications each year (not limited to Nature Index journals).
Technical terms
Selective serotonin reuptake inhibitor (SSRI): A class of antidepressants that block the serotonin transporter to increase extracellular serotonin levels.
Serotonin–noradrenaline reuptake inhibitor (SNRI): An antidepressant that inhibits reuptake of both serotonin and noradrenaline, thereby enhancing transmission of both neurotransmitters.
Tricyclic antidepressant (TCA): An older class of antidepressants characterised by a three-ring chemical structure, affecting multiple neurotransmitter systems and often associated with greater side-effect burden.
5-HT2C receptor: A subtype of serotonin receptor expressed in hypothalamic feeding centres; its activation reduces appetite and modulates energy expenditure.
Positive allosteric modulator (PAM): A compound that binds to a receptor at a site distinct from the orthosteric ligand-binding site, enhancing receptor response to its natural transmitter.
Body-mass index (BMI): A ratio of weight to height squared (kg/m2) used as a standard measure of overall adiposity.
References
- Long-term changes in adiposity markers during and after antidepressant therapy in a community cohort. Translational Psychiatry (2024).
- 5-HT2C Receptor Stimulation in Obesity Treatment: Orthosteric Agonists vs. Allosteric Modulators. Nutrients (2023).
- Antidepressants and type 2 diabetes: highways to knowns and unknowns. Diabetology & Metabolic Syndrome (2023).
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