Brian Pollack, LCSW, CEDS-C
Brian is the Founder and Clinical Director of Hilltop Behavioral Health, a boutique eating disorder specialty practice in Summit, NJ. He is one of the few male master’s-level Certified Eating Disorder Specialists in the country, with expertise in FBT, male clients, athletes, and muscle dysmorphia. He hosts the Minding Men podcast and serves as an adjunct professor at Yeshiva University.
Learn more about Brian →He counted his chews. Not roughly, not as a habit – exactly. Thirty-two per bite, every bite, and if he lost count he started the bite over. His parents thought it was a strange eating disorder ritual. His prior therapist treated it as one. It took months before anyone asked the question that mattered: was the counting about the food, or was the food just where his obsession had landed this time.
That distinction changes everything about how treatment should go. It is also one of the most commonly missed pieces of the puzzle in eating disorder care, because the OCD eating disorder overlap so often gets treated as a single problem when it is really two conditions feeding each other.
Understanding the OCD Eating Disorder Overlap
Obsessive-compulsive disorder is built on a cycle: an intrusive thought creates unbearable anxiety, a compulsion temporarily relieves it, and the relief reinforces the compulsion. Eating disorders often run on a related but distinct cycle involving control, body image, and emotional regulation through food.
Where they meet is in the behaviors. Ritualized eating, rigid food rules, checking behaviors around calories or weight, mental rules that must never be broken, a need for symmetry or exactness in how food is prepared or consumed. From the outside, an OCD-driven food ritual and an eating disorder-driven food ritual can look identical. The difference is what’s actually running underneath: is the goal to reduce anxiety about contamination, harm, or “wrongness,” or is the goal to control weight, shape, or an unbearable feeling. Often, for a given client, it’s both, tangled together.
OCD vs. Eating Disorder Rituals: How Can You Tell the Difference?
The behavior alone usually doesn’t tell you which disorder is driving it. Clinicians look at the feared consequence and the function the ritual serves.
More suggestive of OCD: fear of contamination, fear of causing harm, a need for symmetry or exactness, a “just right” feeling that has to be reached before eating can happen, catastrophic intrusive thoughts.
More suggestive of an eating disorder: fear of weight gain, calorie or intake control, compensating for what was eaten, body checking.
Can point to either, or both: reading every label, following the same eating sequence every time, repetitive checking, avoiding certain foods or situations altogether.
What the Research Actually Shows
This overlap is not rare. A large-scale meta-analysis of the literature found a lifetime OCD prevalence of roughly 14 percent and current OCD prevalence of roughly 9 percent across people with eating disorders, with the risk highest among those with anorexia nervosa‘s binge-eating and purging subtype [1]. Other researchers pooling decades of comorbidity studies found the range climbs even higher in prospective, longer-term follow-up: OCD comorbidity affects almost one fifth of eating disorder patients in cross-sectional studies and up to nearly 40 percent when patients are followed over time [2], showing that OCD symptoms can become apparent at different points over the course of an eating disorder rather than being fully captured at a single assessment. A systematic review focused specifically on childhood and adolescence found the comorbidity runs in both directions, with bulimia nervosa showing a 14 to 17 percent lifetime comorbidity with OCD in general community studies, and anorexia showing comorbidity rates as high as 69 percent in clinical populations [3].
The clinical takeaway from all of this research points the same direction: patients with both OCD and an eating disorder tend to show higher clinical severity and more comorbid conditions than patients with either condition alone [4]. Treating one without recognizing the other is not a minor gap. It can change what needs to be assessed, targeted, and monitored in treatment.
Why the OCD Eating Disorder Overlap Gets Missed
A lot of eating disorder treatment, understandably, focuses on the food behaviors themselves: what was eaten, what wasn’t, what the compensatory behavior looked like. That focus can accidentally treat OCD-driven rituals as if they were purely eating disorder-driven, which means the treatment targets the wrong mechanism.
If a client’s rigid food rules are actually rooted in OCD’s need for certainty and control over contamination or “wrongness,” then teaching flexible, intuitive eating without addressing the underlying obsessive-compulsive process is treating the symptom while leaving the engine running. The rules may shift, target something else entirely, or the anxiety underneath them may simply resurface somewhere new. This is part of why clinicians who understand the OCD eating disorder overlap ask different questions at intake: not just “what are you eating,” but “what happens in your body and mind in the seconds before and after the ritual.”
What Integrated Treatment Looks Like
At Hilltop, when a clinician suspects OCD is part of the picture, treatment doesn’t split into two separate tracks running in parallel and ignoring each other. It becomes one coordinated plan.
That typically includes exposure-based work adapted for the eating disorder context, since exposure and response prevention may need to be adapted carefully when eating disorder symptoms are also present, particularly when an exposure could inadvertently reinforce restriction or another eating disorder behavior. It includes careful assessment of whether a “food rule” is serving an OCD function, an eating disorder function, or both, because the answer changes what the intervention targets. And it includes ongoing reassessment, because these presentations shift over the course of treatment. A client’s OCD symptoms may become more visible once the eating disorder behaviors start to loosen, since the eating disorder was, in some cases, functioning as one more layer of control on top of an already anxious system.
What This Might Look Like in Real Life
Maybe it’s a teenager who cannot eat unless the food on the plate is arranged a specific way, and who describes the anxiety as unbearable, not as being about weight at all. Maybe it’s an adult who checks nutrition labels repeatedly not to restrict intentionally but because an intrusive thought about contamination or harm will not quiet down otherwise. Maybe it’s someone whose eating disorder recovery has stalled because every time the rigid rules loosen, a different obsessive pattern shows up to take their place.
None of these presentations are unusual, and none of them mean treatment has failed. They mean the full picture hasn’t been named yet.
There’s also a version of this that shows up less dramatically: the client who has technically “recovered” by every behavioral marker, weight restored, meals consistent, and who is still exhausted by an internal world of rules, checking, and mental review that never fully quiets. That client is not failing recovery. That client may be describing OCD symptoms that were always present, partially obscured by the louder eating disorder behaviors, and now visible because there’s finally room to see them. Naming that accurately, instead of calling it a relapse risk or a personality trait, often opens the door to the treatment that actually helps.
Getting the Full Picture
If food rules in your life or your child’s life feel less like preference and more like rules that cannot be broken without unbearable anxiety, that combination deserves a closer look than a standard eating disorder assessment alone. This is often where restrictive eating patterns intersect with the broader spectrum discussed in our piece on orthorexia nervosa versus anorexia nervosa, since food purity rules and OCD-driven rigidity frequently overlap. Parents navigating this in a child or teenager can find more on supporting a child through eating disorder treatment.
Frequently Asked Questions About OCD and Eating Disorders
Not always, and that’s exactly why this gets missed so often. OCD and eating disorders can produce food rules and rituals that look almost identical from the outside. What matters is what’s driving the behavior underneath. We help you figure that out.
Yes. Contamination fears, a need for symmetry, intrusive thoughts about harm, a feeling that something has to be “just right” before eating can happen. All of it can attach itself to food. You’re not imagining it, and you’re not alone in it.
You may not be able to tell on your own, and that’s okay. We ask what you’re afraid will happen if the rule gets broken. Fear of contamination or harm points toward OCD. Fear of weight or shape points toward an eating disorder. Often it’s both, and we untangle that together.
Yes. We build one coordinated plan instead of treating them as two separate problems. What that looks like depends on you: your eating disorder, your OCD symptoms, your medical needs, your age, your life.
No. Rituals show up in OCD, eating disorders, anxiety, and more. What matters is why the ritual happens and what happens when you try to stop it. A real assessment can tell you what you’re actually dealing with.
Hilltop Behavioral Health provides eating disorder treatment in New Jersey with clinicians trained to recognize where OCD and disordered eating are working together, not just where the eating disorder shows up on the surface. If this sounds like what you or your family has been navigating, Reach Out Today. The first conversation is free.
Sources
1. Drakes, D.H., Fawcett, E.J., Rose, J.P., Carter-Major, J.C., & Fawcett, J.M. (2021). “Comorbid obsessive-compulsive disorder in individuals with eating disorders: An epidemiological meta-analysis.” Journal of Psychiatric Research, 141, 176-191. DOI: 10.1016/j.jpsychires.2021.06.035.
2. Mandelli, L., Draghetti, S., Albert, U., De Ronchi, D., & Atti, A.R. (2020). “Rates of comorbid obsessive-compulsive disorder in eating disorders: A meta-analysis of the literature.” Journal of Affective Disorders, 277, 927-939. DOI: 10.1016/j.jad.2020.09.003.
3. Di Luzio, M., Bellantoni, D., Bellantoni, A.L., Villani, V., Di Vincenzo, C., Zanna, V., Vicari, S., & Pontillo, M. (2024). “Similarities and differences between eating disorders and obsessive-compulsive disorder in childhood and adolescence: a systematic review.” Frontiers in Psychiatry, 15, 1407872. DOI: 10.3389/fpsyt.2024.1407872.
4. Sallet, P.C., Alvarenga, P.G., Ferrão, Y., Mathis, M.A., Torres, A.R., Marques, A., Hounie, A.G., Fossaluza, V., Rosario, M.C., Fontenelle, L.F., Petribu, K., & Fleitlich-Bilyk, B. (2010). “Eating disorders in patients with obsessive-compulsive disorder: Prevalence and clinical correlates.” International Journal of Eating Disorders, 43(4), 315-325. DOI: 10.1002/eat.20697.
