How many pounds of food/fluids you have to eat for your stomach to explode?!
How much do you have to eat for that to happen?
Answers:
Well, it is possible for your stomach to rupture but honestly, I think your body would let you know you need to stop eating way before that point. I'm guessing in the cases you heard about, the people died from other stresses put on their body - namely on their heart when they inevitably started puking.
The Mythbusters TV show did the myth about pop-rocks candy and soda pop. They used an actual pig's stomach because it's about the same size as a human's. They were unable to get the stomach to actually burst - even after pouring a pound of candy and 4, 2 liter bottles of soda into their test setup. The stomach expanded quite a bit but didn't burst. In the end, the clamp they had attached to the stomach popped off, and made a mess on the floor. Had this been a real human he would have puked and felt horrible but would otherwise survive.
3 pounds