I have posted this previously: The perfect radiation diet is a double whopper w/ cheese and fries. Hold the pickle, lettuce and tomato. 3 meals daily.
And call your cardiologist🤭

More seriously though, I modified my otherwise very high fiber diet, which keeps me very regular (Amtrak should run with my regularity) and gave me the "mostly empty rectum". And I reduced, but did not eliminate, the fiber and most gas producing foods (limited brocolli and bye-bye black beans).

And did not get booted from the table (fortunately)✌️

Also took a GasX at night after eating. That might be my best suggestion.

Good luck. And apologies for my attempts at humor.