What triggers the diarrhea in people from eating MREs lots of the time is simply MSG. Being allergic to MSG myself, this is the mildest reaction I have to it. I FINALLY learned to quit eating Hidden Valley Ranch dressing lately - it does it every time to me because it contains MSG (duh on my part).

IF MSG ISN'T HARMFUL, WHY IS IT HIDDEN?

http://www.truthinlabeling.org/