I think that is what they are trying to find out.
Tell us, did they have a tendency to bind one up so to speak?
That could and should be corrected with supplement tablets added directly with the meal. Just an added package.
It might depend on the pill; things work differently on different people, and a laxative might be worse than the problem, especially in military situations.
But from my own experience, probiotics are very helpful for fixing a number of ills in that area, and I doubt many people would have bad side-effects from them.
I don’t know how ‘accepted’ probiotics are among the medical experts, but they might be a good thing to include in MREs.
-JT
Absent additional fiber, bricks come to mind. I mean, real bricks.