As a Psychotherapist, I often hear clients ask: “Why does my brain feel like it’s working against me?” or “Does therapy really change the brain?”
The good news is that the brain is not fixed. It is plastic, meaning it can adapt, learn, and rewire throughout our lives. MRI and neuroscience research now shows us how the brain works differently in conditions such as Obsessive–Compulsive Disorder (OCD), Complex Post-Traumatic Stress Disorder (cPTSD), and Eating Disorders. We also know that many clients experiencing these conditions are also neurodivergent, for example, living with Autism or ADHD. This overlap is not a coincidence. Differences in brain wiring can make certain people more sensitive to anxiety, trauma, or rigid patterns of thought and behaviour.
Importantly, none of these changes mean the brain is “broken.” They reflect adaptations, survival strategies, that the brain has learned over time. With the right therapy, these patterns can shift.
Let’s explore how the brain is affected in each condition, and how therapy can help.
OCD: When the Brain Gets Stuck on Repeat
OCD is strongly linked to an overactive cortico-striato-thalamo-cortical (CSTC) circuit, a loop that keeps thoughts and behaviours circling.
- Orbitofrontal Cortex (OFC): Judges risk, importance, and value. In OCD, it can “overestimate danger” or inflate responsibility.
- Anterior Cingulate Cortex (ACC): Detects when something feels wrong or incomplete. In OCD, this “error detector” can be hyperactive, making people feel constant doubt.
- Striatum (Caudate/Putamen): Important for habits and routines. In OCD, it struggles to switch gears, keeping the same thoughts or actions repeating.
- Thalamus: Relays signals back to the cortex, directing attention. In OCD, it reinforces the loop rather than helping to move on.
For neurodivergent people, especially those with Autism or ADHD, these loops can feel even stronger. Autistic clients may experience heightened sensitivity to uncertainty or a powerful drive for control, while ADHD can add impulsivity that fuels compulsive cycles.
Therapy connections:
- CBT with ERP retrains the CSTC circuit by breaking the link between intrusive thoughts and compulsions.
- Schema Therapy addresses perfectionism, shame, or self-critical patterns often underlying OCD.
- EMDR helps when OCD symptoms are rooted in trauma.
Therapist tip:
When a thought feels urgent, try saying: “This is my brain’s loop, not reality.” Then delay the compulsion for just a few minutes. Over time, these pauses help weaken the OCD cycle.
cPTSD: Trauma’s Lasting Imprint on the Brain
Trauma reshapes how three major areas of the brain interact:
- Amygdala: The alarm system, constantly scanning for danger. In cPTSD, it becomes hyperactive, explaining flashbacks, hypervigilance, and strong emotional reactions.
- Hippocampus: The memory and context centre. Often smaller or underactive in trauma survivors, it can blur the line between past and present, making old memories feel like they are happening “right now.”
- Prefrontal Cortex (PFC): The rational, calming centre. In trauma, it can be suppressed, making it harder to soothe distress or think clearly in moments of overwhelm.
For neurodivergent people, these effects can be magnified. Autistic and ADHD brains already process sensory input intensely; when combined with trauma, the amygdala may go into “high alert” more quickly. Many neurodivergent clients also experience a lifetime of misunderstanding, bullying, or masking, which in itself can create complex trauma.
Therapy connections:
- EMDR helps the brain reprocess traumatic memories, calming the amygdala and strengthening the PFC.
- Schema Therapy reshapes deep-rooted beliefs such as “I am worthless” or “I cannot trust others.”
- CBT and integrative trauma approaches focus on grounding, regulation, and safety.
Therapist tip:
Try the 5-4-3-2-1 grounding technique: name 5 things you see, 4 things you feel, 3 things you hear, 2 things you smell, and 1 thing you taste. This gently re-engages the prefrontal cortex and helps the brain realise, “I am safe now.”
Eating Disorders: When the Brain and Body Struggle to Connect
Eating Cisorders affect multiple brain areas:
- Insula: Helps sense hunger, fullness, and body awareness. In eating disorders, it often misfires, making it difficult to trust body signals.
- Striatum and Reward Pathways: In Bulimia or Binge Eating Disorder, food cues can trigger stronger “reward” responses, while self-control systems struggle to balance urges.
- Prefrontal Cortex: Important for decision-making and control. In Anorexia, it may over-activate in rigid, rule-based ways, supporting extreme self-control around food.
- Brain volume: In starvation states, brain volume can shrink, but importantly, this often reverses with recovery and nourishment.
Neurodivergence is common in Eating Disorders. Many autistic clients describe feeling disconnected from internal body cues, relying instead on rules or routines to manage eating. ADHD can increase impulsivity, making binge-eating cycles harder to interrupt.
Therapy connections:
- CBT-E addresses rigid thinking and eating behaviours.
- Schema Therapy works with core fears such as rejection, abandonment, or inadequacy.
- EMDR helps process painful memories linked to body image, bullying, or trauma.
- Integrative therapies rebuild compassion and trust in the body.
Therapist tip:
Before meals, pause and ask: “Am I feeling hunger, emotion, or habit?” Even if the answer is unclear, this mindful check-in helps strengthen the insula’s connection over time.
Shared Themes Across Conditions and Neurodivergence
Though OCD, cPTSD, and eating disorders look very different, they share important patterns:
- Overactive alarm systems: Whether it’s the amygdala in trauma or the error detector in OCD, the brain often signals “danger” too often.
- Difficulty switching states: The striatum and related circuits struggle to move from one thought, feeling, or behaviour to another. This is also common in neurodivergence, explaining why change feels so effortful.
- Disconnect from internal cues: Whether hunger, safety, or trust, the brain struggles to accurately interpret body or emotional signals.
- Plasticity and hope: These patterns are not permanent. With therapy, the brain learns new connections and healthier pathways.
Therapist tip
Remind yourself daily: “My brain is adaptable. Healing is possible.” Neuroplasticity means the brain can grow new patterns at any stage of life.
Note: Research findings are based on group studies and cannot diagnose an individual. Each person’s experience is unique, and therapy is always tailored to you as a whole person.
A Message of Hope
If you are struggling with OCD, cPTSD, an Eating Disorder, or if you’re also neurodivergent and feel like the world wasn’t built for your brain, please know:
- You are not broken, your brain adapted to survive.
- Change is possible, the brain can reorganise and heal.
- Therapy helps not only reduce symptoms but also build new pathways for connection, resilience, and self-trust.
In my practice, I integrate CBT, Schema Therapy, EMDR, and other evidence-based approaches to help clients create real change at both the emotional and neurological level.
If you’d like to explore how therapy could support your recovery journey, I would love to hear from you. For more visit: foodforthoughttherapy.co.uk or e-mail agi@foodforthoughttherapy.co.uk
