Had weekly diarrhea and dr did a colonoscopy found nothing sand told me to get used to it as it was aging. My microscopic colitis from 2018 was no longer active per the colonoscopy biopsy. 6 months later diarrhea was increasing and eventually I had it everyday in July. Was waiting for opening at gastro office when friend mentioned gluten. I stopped eating white bread for one day (white bread for histamine intolerance) and my diarrhea disappeared. Went from daily to zero diarrhea. Neither pcp nor gastro dr ever mentioned gluten as the problem