@penelope52,

A low residue diet is basically a low-fiber earing plan. It is not helpful for every type of digestive tract problem but has helped many. Here is a link to some information about it.
--Low Residue Diet,
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/low-fiber-diet/art-20048511
As you can see, this eating plan for people with certain types of digestive problems.