Last year researchers from Washington University led by Kathleen Holton PhD reported a caste study of a man who's long time resistant OCD disapeared after taking glutamate free diet for fybromialgia.ncbi.nlm.nih.gov/pmc/articl...
I contacted her and she gave me the plan, which can be found here.
There is also great interview with her where she mentions it.
I tried it for 25 days but unfortunatelly it did nothing for me. My source of excitotoxicity is probably coming from my high blood homocysteine, so you can check that alongside with B12 and folate levels too.
Anyway, it's a really really healthy diet, and you can't lose anything with it. Def worth a try!
P.S. I also wrote a thread how magnesium helped me and which I took here healthunlocked.com/my-ocd/p...