Yes, I agree trial and error and keeping a food journal is only thing to help and try. My issue is opposite most it seems, as I rarely have any issues with constipation and mainly struggle with a thicker and/or looser stool (not diarrhea). So, i have a very narrowed rectum that’ll have to be stretched often and they want me taking fiber pills to keep the stool bulked so it’ll open that narrowed part up, but it only takes very little fiber for me and then I end up with accidents or almost accidents due to the stool being loser as well as the radiation and everything having messed with the sphincter down there. I’m hoping to eventually find some physical therapy to help me not end up with a permanent colostomy bag! Yikes! I think you’re right with a very customized diet! Hoping you continue to feel better and recover!