To answer your question: I hesitate to use the word "cure", because 3-4 months on, I'm starting to wonder if certain things have begun to slide back, or if it's just been a challenging week. Time will tell.
A datapoint that I did not mention in my first post was that there was a negative, persistent, digestive side-effect that paralleled the positive mental changes. As that has faded, so have some of the noticeable mental changes. I'm still doing better, but maybe with less energy than a month or so after the fast. I hope not, but maybe this is something I'll have to repeat every now and then.