I find that the foods that gave me issues before surgery still give me issues.
so I try to avoid large quantities of dairy and gluten. That said, I love red meat, but anything more than 4 oz will cause severe butt burn. I am guessing here that all that fat will cause an increase in bile and a more caustic stool.
I try and stick with foods that cause the least issues. When I stay inside my self imposed boundaries I have a good QOL. When I stray not so good.