I'm 69 and was diagnosed with MGUS and collagenous colitis (a cousin of your colitis) about 8 years ago. No association between the two, I just seem to collect afflictions (there are better hobbies). The MGUS is asymptomatic and the colitis I can control with diet, trying to avoid stress, getting enough sleep, and such. I have celiac so am GF and on a mostly FODMAP diet. People with celiac (or gluten intolerance?) are more likely to have microscopic colitis (MC). My GI said to avoid all NSAIDs with MC. Five days of baby aspirin 2x/day was enough to kick off a flare with me. Everyone is different regarding triggers. I can eat diary and most other foods, but have to avoid gluten, and limit legumes, cashews, pistachios, and most processed food. High fiber, other nuts, seeds, and such cause me no problems. I have a friend with severe diverticulitis and he has a very restricted diet that is complicated by his being an extremely picky eater.