Years ago I knew someone who had colon issues, and their doctor said
they needed to cut back on the amount of corn and nuts they ate.
Otherwise they might have to have some of their colon removed (from
what I can recall).

Is this true? And if so, is it strictly a matter of moderation - or it
doesn't matter how little you eat, it's bad for your colon, period.

I know that the intestines have trouble with that almost translucent
skin of the kernels.

I didn't know that nuts could be "harmful" if at all? Though I know
about peanuts often not being completely broken down, so that must be
hard on the intestines too if not completely chewed properly.