In my case my diagnosis was because they didn't know what was going on and the gastro doc ordered a camera both ends to rule things out - it showed up on the co

In my case my diagnosis was because they didn't know what was going on and the gastro doc ordered a camera both ends to rule things out - it showed up on the colonoscopy and the biopsies up til then I had no idea. I'd lost a lot of weight worryingly fast - mostly because of massive reflux problems (barrets oesophagus), was having frequent bouts of vomiting and diarrhoea and was generally in a shit state all around - as for diet it's really hard to recommend anything to anyone else since it varies so much - what worked for me was keeping a detailed journal of what I ate, how I felt, how I slept, toilet habits, times etc then I cut out basically everything from my diet I could for a few weeks (think porridge, cottage cheese and mashed potato/oven cooked chicken breasts) and very gradually added things back still keeping the journal until I had actual data I could look at - for me there isn't really any one food or group that acts as a trigger red meat/processed meat comes the closest, it's large high fat/high carb (think Pizza) that do it - if I eat fresh foods/veggies/fish/cheese (hard not soft) and limited amounts of fruit I have it mostly under control but what works for me might wreck you.