Neuroscientific Mechanisms of Eating Behavior and Obesity

Eating behaviour and obesity arise from the dynamic interplay between homeostatic and hedonic neural circuits. Homeostatic control centres in the hypothalamus integrate peripheral signals—such as leptin, insulin and ghrelin—to regulate energy balance. Parallel mesolimbic pathways, notably the ventral tegmental area–nucleus accumbens dopamine system, assign incentive value to food cues and drive reward‐related feeding. Prefrontal cortical regions mediate executive control, enabling restraint and decision‐making, while limbic structures, including the hippocampus and amygdala, contribute to memory of food context and emotional modulation. Dysregulation at any node—for example, hypersensitivity of reward circuits or diminished inhibitory control—can promote overeating and weight gain. Neuroimaging studies reveal altered activation in reward‐related areas of individuals with obesity, and circuit‐level manipulations in animal models have delineated subpopulations of neurons controlling the balance between intake and expenditure. Understanding these mechanisms offers avenues for targeted interventions, from neuromodulation to cognitive training, to curb the global rise in obesity.

Research from Nature Portfolio

Recent studies have uncovered a specialised orexigenic subnetwork linking the lateral hypothalamus to a specific hippocampal subregion in humans. Multimodal mapping combining tractography, intracranial electrophysiology and 3D histology demonstrated that this circuit exhibits heightened responsiveness to sweet-fat cues and that its connectivity inversely correlates with body mass index, suggesting a role in dysregulated eating. Complementary work in mice has dissected dopaminergic control within the nucleus accumbens core, showing that D1‐receptor neurons promote effortful reward seeking and voluntary activity while reducing intake, whereas D2‐receptor neurons drive feeding. Bidirectional chemogenetic manipulation of these populations can shift the balance between energy intake and expenditure, with potential implications for disorders spanning obesity to anorexia.

Neuroscientific Mechanisms of Eating Behavior and Obesity publication trend

The graph below shows the total number of articles in neuroscientific mechanisms of eating behavior and obesity across all publications each year (not limited to Nature Index journals).

Technical terms

Orexigenic: Pertaining to neural signals or circuits that stimulate appetite.

Chemogenetics: A technique using engineered receptors to selectively activate or inhibit target neurons with designer molecules.

Tractography: Imaging method for visualising white-matter pathways in the brain.

Electrophysiology: Recording of electrical activity from neurons or neural circuits.

Interoception: Sensory process by which the brain monitors internal bodily states.

Mesolimbic dopamine system: Neural pathway from the ventral tegmental area to the nucleus accumbens that mediates reward processing.

References

1. An orexigenic subnetwork within the human hippocampus. Nature (2023).
2. Nucleus accumbens D1- and D2-expressing neurons control the balance between feeding and activity-mediated energy expenditure. Nature Communications (2024).
3. Causes of Emotional Eating and Matched Treatment of Obesity. Current Diabetes Reports (2018).
4. Depression, emotional eating and long-term weight changes: a population-based prospective study. International Journal of Behavioral Nutrition and Physical Activity (2019).
5. Neural Responses to Visual Food Cues According to Weight Status: A Systematic Review of Functional Magnetic Resonance Imaging Studies. Frontiers in Nutrition (2014).