Is it diarrhea or soft serve? Diarrhea is watery or jelly like. That could be a bug if short lived. Canned pumpkin can help with that. or a bland diet until the stool is good, read ingredients very closely when switching because the same thing that causes indigestion can be in both foods and not necessarily the protein as the problem. It may be a good idea for you to try home cooking , you can make a weeks worth or more in advance by freezing portions. This cuts down on the amount of ingredients that can cause the disturbance keep me posted whatever you decide , I curious and concerned