Does steak rot in your stomach?

It is because red meat takes longer in its journey through your body to digest, and then "goes off" while on its travels, which then release toxins that cause an upset stomach

Red meat never upsets my stomach nor does it "go off" in my stomache. I chew my meat before I swallow and since your system was designed to use meats and veggies and grains and nuts of all types you shouldn't be having any troubles if you chew your food properly and don't over eat and eat slowly.