I've never really tried to change it, I adapted as best as I could.
I'm intolerant to most fodmap (lactose, mannitol, fructans, gos and fructose). I also noticed that gluten can wreck me if I eat too much of it, fatty food can trigger me as well as alcohol.
It was hard to get used to it but now it's a question of self regulation. I skip most of the things that trigger me and indulge sometimes, often a bit too much and I have to face the consequences for up to a week or so. Lactose is the easiest to deal with because of lactase, the rest not so much... I guess at least I'm not celiac or suffering of Crohn's, so that's that I guess.