Eating disorders and obsessive compulsive disorder are often diagnosed at the same time. The different ways these disorders interact can have a vastly different effect on treatment.
One effect of food restriction is the increase in obsessive thinking about food. Our brains are designed to focus more on food when our intake is limited—an adaptive mechanism to survive periods of famine.
The longer the period of restriction continues, the more the OCD behaviors can spread to other parts of life not connected with food.
Many eating disorders involve periods of food restriction. Even if someone binges or overeats at times, any consistent restriction of eating can trigger obsessive thinking about food.
This type of OCD typically responds to normalizing eating. As the body and mind get used to regularly, obsessive thoughts around food, and other things, tend to diminish.
For some people with eating disorders, OCD is an independent disorder that may be exacerbated by, but not a consequence of, the eating disorder. These people have OCD thoughts and behaviors prior to the eating disorder. The obsessions may be about food and also about many other things. Sometimes the OCD itself is the primary issue which focuses solely on the eating disorder at its height and switches to other obsessions through recovery.
For these people, OCD treatment is a necessary part of recovery. If the eating disorder and medical state are severe at first, then the eating disorder needs immediate attention. Once enough stability is achieved, OCD treatment becomes essential.
Medication for OCD largely entails high doses of antidepressants. This treatment can decrease symptoms significantly but is much more effective with concomitant therapy.
Two types of OCD therapy are common. The first is exposure therapy which encourages facing the obsessive fear directly and leads to decreased anxiety around the obsession. This treatment is the gold standard for OCD and is very effective for many obsessions but is harder to do for eating disorder thoughts. Facing the fear of weight gain directly typically is not very effective.
A second type of therapy is called Inference Based Therapy (IBT) which confronts the thought process and lack of logic in OCD. This type of therapy highlights the self-doubt caused by OCD and instead reinforces the idea that there is no real world evidence for the obsession because these thoughts are illogical. This approach can be helpful for OCD related to food thoughts as well.
Distinguishing types of OCD for people with eating disorders increases the likelihood of recovery. Eating disorders are very prevalent and come in all shapes and sizes. Thus, recovery and treatment need to focus on the myriad paths people follow toward health.