Capsaicin and IBS is an unsafe mixture.

I am firmly of the mind it's because the extra fiber added in the meat while also generally having beans and either they get too much and do have the shits, or are constipated so often, a normal soft poo feels like diarrhea to them.

Now Jack in the Box is a whole other story. I have definitely gotten sick from a JitB taco.

I've heard a theory that it's some sort of soy intolerance since the beef contains soy lecithin. Or it could be the oats. But I know that people have issues with items that don't have beans.

I had issues afterward, but my best guess is that it was the flour tortillas + gluten intolerance. Even happened when I ate the potato tacos that had none of the powdered meat, beans, or plastic cheese in them.

It gives me diarrhea but I’ve also found that any other fat food place does also. I almost exclusively eat food I’ve made at home so I just assume their must be something different with the food at fast food restaurants in general.