How about my friend, whose "bipolar" disappeared when they got a positive test result for celiac and stopped eating gluten? Or myself for that matter, whose problems with sleep, gait, muscle weakness, mood instability, and difficulty paying attention all more or less evaporated when I went gluten free after my own celiac diagnosis?

These weren't quack diagnoses either. We both saw traditional gastroenterologists, in different states, several years apart, both of us seeking treatment for different things. My diagnosis was confirmed with blood and endoscopy, as well as a follow-up DNA test to make sure I had the right mutation that makes it possible for celiac to arise.