Anorexia Nervosa: Unpacking Addiction-Like Brain Pathways for New Treatments

Anorexia Nervosa (AN) is a severe and often chronic eating disorder characterized by extreme food restriction, an intense fear of gaining weight, and a distorted body image. Despite its high mortality rate and significant impact on quality of life, current treatments are often insufficient, highlighting a need for a deeper understanding of its underlying neurobiology. This review explores how neurobiological systems involved in addiction, such as reward, control, and compulsion, contribute to the complex pathology of AN.

The review identified significant neurobiological overlaps between Anorexia Nervosa (AN) and addiction-like features, particularly within the dopaminergic, endocannabinoid, and orexinergic systems. Dysregulation in the dopaminergic system was linked to altered reward processing, where AN patients may experience reduced pleasure from food but heightened reward from self-starvation and excessive exercise. The endocannabinoid system, crucial for appetite stimulation and mood, showed altered signaling that could contribute to both food restriction and anxiety. Furthermore, the orexinergic system, known for its role in arousal and appetite, appeared to drive compulsive behaviors and hyperactivity often seen in AN. The review strongly suggests that Anorexia Nervosa shares core neurobiological mechanisms with addictive disorders, particularly concerning altered reward pathways and compulsive behaviors. These insights point towards a re-conceptualization of AN that incorporates these addiction-like features.