I have a terrible digestive system and everything attached to it.
-Train your body to go at a certain time
-Eat a bowl of high fiber cereal in the morning.
-Keep your water intake high
-Eat 30-45 grams of fiber a day.
-Lots of fruits and veggies. Less meats.

In the search for determining a method to make my stomach happy I turned vegetarian by accident. lol

Keep a journal of what works for you and stick to it.

My 2 cents.