Two to three meals a day, almost no snacks, generally a decent amount of fiber. Mom's basically the same and I think grandmother was. Mom has been diagnosed with various forms of IBS. Dad has Celiac's and a DNA test I took said increased risk.
If I go keto, almost all the issues disappear. Trying to do that is basically impossible whilst living with my wife because I can't just not make food and not keep anything I shouldn't eat in the house (my willpower eventually crumbles when I'm busy or stressed).