Everything you need to know about TMS for Eating Disorders: Targeting the Compulsive Overvaluation of Shape and Weight — how it works, what it costs, and how to find a provider who actually knows what they're doing.

Eating disorders have the highest mortality rate of any psychiatric condition, yet treatment options remain limited. Anorexia nervosa, bulimia nervosa, and binge eating disorder share a common psychological hallmark: the compulsive overvaluation of shape and weight, where concerns about body image drive pathological eating behaviors. Emerging research suggests that TMS may be able to modulate the neural circuits underlying this core feature, offering a novel approach to treatment.

What You’ll Learn

• How the salience network, reward network, and executive control network are dysregulated in eating disorders
• Why the DLPFC is a key target for TMS across different eating disorder types
• What research shows about TMS for anorexia, bulimia, and binge eating disorder
• Novel targeting approaches including the insula and cerebellum
• Limitations and challenges in the current evidence base

The Neurobiology of Eating Disorders

Modern neuroimaging has revealed that eating disorders involve dysfunction in several interconnected brain networks:

The salience network, centered on the anterior insula and dorsal anterior cingulate cortex, governs attention to body-related stimuli and interoceptive awareness (the perception of internal bodily states). In anorexia, this network may be hyperactive, leading to heightened awareness of hunger and fullness signals. In binge eating, it may drive excessive attention to food cues.

The reward network, involving the ventral striatum and orbitofrontal cortex, processes the rewarding aspects of food and eating. Anorexia patients may show reduced reward responses to food, while binge eating disorder may involve enhanced reward activation in response to highly palatable foods.

The executive control network, centered on the dorsolateral prefrontal cortex (DLPFC), normally regulates impulsive responses and inhibits inappropriate behaviors. This network is often underactive in eating disorders, contributing to the inability to control eating impulses.

These networks interact with the default mode network, which is involved in self-referential processing and body image attitudes. The overvaluation of shape and weight may represent a self-referential belief system maintained by hyperconnectivity within these circuits.

Why the DLPFC Is a Key Target

The DLPFC serves as a regulatory hub that can influence both the salience and reward networks. When the DLPFC is underactive, the normal “top-down” control over eating impulses and body-related concerns is diminished. TMS targeting the DLPFC may enhance this regulatory function, reducing the intensity of compulsive overvaluation and binge/purge urges.

Different eating disorders may require different targeting approaches:

• Anorexia nervosa may benefit from left DLPFC stimulation to enhance cognitive control
• Bulimia nervosa and binge eating disorder may respond to both left and right DLPFC targets, addressing both the impulsive binge behaviors and the compensatory purging or restrictive thoughts

Research Findings by Disorder

Anorexia Nervosa

Anorexia presents unique challenges for neuromodulation. The cognitive deficits associated with malnutrition can affect treatment engagement, and the condition carries significant medical risks. However, several pilot studies have shown promising results.

A 2019 study published in PLOS ONE used high-frequency TMS to the left DLPFC in 28 patients with anorexia and found significant reductions in core eating disorder psychopathology, including reductions in the Eating Disorder Examination Questionnaire (EDE-Q) scores. The effects persisted at 4-week follow-up.

Research teams at the University of Toronto and King’s College London are currently conducting larger randomized controlled trials of TMS for anorexia, with particular attention to whether treatment effects differ before and after weight restoration.

Bulimia Nervosa

Bulimia nervosa has perhaps the most promising evidence base for TMS. The impulsive nature of binge-purge cycles aligns well with the executive dysfunction seen in prefrontal networks.

A 2021 randomized sham-controlled trial in the American Journal of Psychiatry found that 20 sessions of high-frequency left DLPFC TMS over 4 weeks produced significant reductions in binge eating and purging behaviors compared to sham treatment. Patients also reported reduced feelings of shape and weight overvaluation.

The compulsive overvaluation that drives bulimia may be particularly amenable to DLPFC modulation because it involves sustained self-referential processing that executive networks normally regulate.

Binge Eating Disorder

Binge eating disorder, the most common eating disorder, involves recurrent episodes of eating large quantities of food in discrete time periods without compensatory behaviors. Neuroimaging studies have shown heightened activation in reward regions (striatum, orbitofrontal cortex) in response to food cues.

A 2020 study targeting the medial prefrontal cortex (mPFC) found that active TMS reduced self-reported cravings for high-calorie foods and decreased neural activation in response to food images. Other studies targeting the DLPFC have shown reductions in binge eating frequency.

Novel Targeting Approaches

Researchers are exploring several innovative targeting strategies:

The insula: As the hub of interoceptive awareness, the anterior insula is a compelling target. However, its deep location requires specialized coils (H-coils or double-cone coils) for effective stimulation. Early studies suggest insula-targeted TMS may reduce sensitivity to hunger cues.

The posterior superior frontal gyrus: This region is involved in self-referential processing and may be specifically relevant for the overvaluation of shape and weight. Connectivity-guided targeting using resting-state fMRI may help personalize stimulation sites.

The cerebellum: Often overlooked, the cerebellum plays important roles in motor learning and habit formation. Cerebellar TMS may address the automatic, habitual nature of binge eating behaviors.

Limitations and Challenges

The current evidence base has several limitations:

• Small sample sizes in most studies
• Variable outcome measures making cross-study comparison difficult
• Unclear durability of treatment effects
• Nutritional status may influence TMS effects in anorexia
• Comorbid conditions such as trauma or personality disorders may affect response
• Ethical considerations in treating minors with neuromodulation

Future Directions

The field is moving toward personalized, connectivity-guided TMS protocols that use individual neuroimaging to identify optimal stimulation targets. Combination approaches using TMS alongside psychotherapy (particularly Enhanced Cognitive Behavioral Therapy, or CBT-E) may prove most effective. Wearable devices for at-home maintenance stimulation are also being investigated.

Is TMS Right for an Eating Disorder?

TMS for eating disorders remains an investigational treatment. It should be considered adjunctive to, not a replacement for, evidence-based psychotherapies and medical monitoring. Patients interested in TMS should seek specialized treatment centers with experience in both eating disorders and neuromodulation.

For those with treatment-resistant eating disorders who have failed multiple rounds of evidence-based therapy, TMS may offer a new avenue of hope.

If you or someone you know is struggling with an eating disorder, contact the National Eating Disorders Association helpline at 1-800-931-2237 for support and resources.