Bidirectional Regulatory Effects of Exercise on Emotional Eating in Depression: An ERP-Based Narrative Review

Why It Matters

Understanding how exercise differentially modulates neural circuits underlying overeating and undereating offers a route to personalized, low‑cost treatments for depression‑related eating disturbances, potentially reducing relapse and healthcare costs.

Key Takeaways

• Emotional eating splits into overeating and undereating phenotypes in depression
• EOE shows heightened reward response, weak inhibitory control in ERP studies
• EUE displays blunted reward processing and excessive conflict monitoring
• Exercise may boost control for EOE and reward for EUE, per hypothesis
• Future trials should test phenotype‑targeted exercise using ERP food‑cue tasks

Pulse Analysis

Depression frequently co‑occurs with dysregulated eating, yet research has traditionally treated emotional eating as a single, excessive behavior. Recent work distinguishes two opposing phenotypes—emotional overeating (EOE) and emotional undereating (EUE)—each driven by different neurocognitive mechanisms. Event‑related potentials (ERPs) provide millisecond‑level insight, revealing that EOE is characterized by heightened early attentional bias, reduced N2/P3 amplitudes indicating weak conflict monitoring and inhibitory control, and an amplified late positive potential (LPP) reflecting strong reward salience. By contrast, EUE shows attenuated reward anticipation (SPN), diminished P3 and LPP responses, and an exaggerated N2, suggesting excessive monitoring without adequate reward feedback.

These divergent ERP signatures suggest that a one‑size‑fits‑all approach to treatment is insufficient. While pharmacotherapy and cognitive‑behavioral therapy address mood symptoms, they often fail to correct the automatic neural responses that trigger maladaptive eating. Exercise emerges as a promising non‑pharmacological lever because aerobic and resistance training have been shown to modulate N2, P3, and LPP amplitudes in healthy and clinical populations. For individuals with EOE, regular physical activity may strengthen executive control networks, dampening the motivational pull of high‑calorie food cues. Conversely, for those with EUE, exercise could enhance reward system responsiveness, counteracting anhedonia‑related blunting and reducing excessive conflict monitoring.

The review’s bidirectional regulatory model is hypothesis‑generating, urging researchers to design phenotype‑stratified randomized controlled trials that pair exercise protocols with emotion‑induced food‑cue ERP tasks. Such studies would clarify dosage, intensity, and modality effects, paving the way for precision interventions that align neural targets with behavioral outcomes. If validated, this approach could transform clinical practice by offering tailored, low‑cost strategies to mitigate both depressive symptoms and disordered eating patterns, ultimately improving long‑term mental health outcomes.