What are the natural cures for obsessive compulsive disorder?

No "cures" exist: Well established ocd is a challenge even with good psychotherapy and pharmaceutical support but is can often be managed and greatly relieved. No doubt that a person with a healthy life-style and good nutrition will be better able to win the struggle, but it's probably best not to think in terms of cure - natural or not. Seek an ocd expertised cbt therapist and work together. Best!

Therapy: If when you say natural you mean without psychotropic medications, then psychotherapy is the way to go. Typically, the emotional impetus behind OCD is unresolved fear or anger, which gets explored in treatment by a clinician who specializes in OCD.