My RO said absolutely NO prunes while in radiation - they produce too much gas. I usually eat a lot of corn, beans and cruciferous veggies which keep me regular as rain but cannot eat those either - more gas!
So now I take a non-fermentable fiber supplement called Healthy Fiber - get it on Amazon. 3X per day with lots of water gives you almost 20gms of fiber. Also eat oatmeal which is allowed. Pretty much a ‘FODMAP’ diet used for those with IBS.
It’s working so far🤞🤞