Why is the reward system important?
Normally, food activates homeostatic hunger signals and hedonic reward systems together. In anorexia nervosa, while food reward may decrease, weight loss, a sense of control, exercise, or hunger itself can become reinforcing in certain individuals. Over time, voluntary restriction may become more automatic through habit and compulsivity circuits.
Dopamine system
The mesolimbic dopamine network plays a role in motivation, learning, and reward prediction. In anorexia, it is thought that dopaminergic responses may diverge from the “food = reward” pattern and that different weights may be given to stimuli such as uncertainty, control, or weight loss. Findings are heterogeneous; a single dopamine model does not explain all patients.
Orexin system
Hypothalamic orexin neurons connect energy status, wakefulness, movement, stress, and reward circuits. During hunger, orexin activity can increase and support food-seeking behavior. In anorexia nervosa, however, it is suggested that this system may be regulated differently in the context of prolonged energy restriction and excessive physical activity.
Endocannabinoid system
CB1 and CB2 receptors and endocannabinoids such as anandamide affect appetite, reward, stress response, and mood. Changes in this system have been reported in anorexia; however, findings may be influenced by illness stage, low weight, refeeding, and psychiatric comorbidities.
How accurate is “addiction to starvation”?
A comprehensive 2026 narrative review argues that addiction-like features in anorexia may intersect with dopaminergic, endocannabinoid, and orexinergic systems. The authors propose a “Starvation-Drive” model. This hypothesis is compelling, but it does not mean that anorexia nervosa is diagnostically an addictive disorder.
What does it change clinically?
This framework supports that treatment should not consist solely of weight restoration. Behavioral flexibility, compulsive exercise, fear learning, reward retraining, anxiety, body image, and nutritional rehabilitation should be addressed together. Pharmacologically, approaches targeting these circuits are being investigated; however, at present, there is no standard approved anorexia treatment targeting the orexin or endocannabinoid system.
Why does refeeding remain central?
Prolonged energy deficiency alters the brain’s hormone, neurotransmitter, and circuit function. Therefore, some neurobiological differences may be the consequence rather than the cause of the illness. Without nutritional rehabilitation, the approach of “fixing a single pathway in the brain” remains incomplete.
Limitations of the evidence
A significant portion of this field relies on small-sample imaging, biomarker, animal, and cross-sectional human studies. Causality is not definitive for most mechanisms. The 2026 article is not a randomized treatment trial, but a narrative review synthesizing 146 publications.
References
- Ziemichód W, et al. Rethinking anorexia nervosa through the lens of control, compulsion and reward. Neurosci Biobehav Rev. 2026;185:106615. DOI: 10.1016/j.neubiorev.2026.106615. PMID: 41763342.
- New Scientist, October 2026: analysis on anorexia, the reward system, and new neurobiological models.
Last medical review: October 17, 2026
