Ignoring food choices, consider soups, smoothies and porridges. Liquidy foods to go around the curves.

Also slippery elm inner bark tea. It supports the mucosa. A lack of "slip" in the colon can contribute to constipation. I also eat foods that act as stimulant laxatives at night - kiwi and rhubarb.

I also take a very small dose of Zoloft. It helps with constipation (side effect) and the anxiety trigger I have for IBS. I can't handle many drugs and cut the 25 mg Zoloft pill into quarters and that is the right dose for me. Also Intoleran digestive enzymes for carbohydrates and lactose.

Looking at food choices, I am highly FODMAP sensitive and only eat about 15 foods. Non-meat proteins. No grains. It's pretty radical but it works.

All my best to you!