Of every thousand people who get a gastric bypass surgery, about two will die from it. Gastric bypass death is because of all the complications. After all, we are talking about stapling bits of your organic stomach in order to cut off most of your stomach and small intestine from doing what they are evolved to do. Most people develop infections when leaks form, spilling bits of undigested food into the body cavity, where it then rots into a smelly, stinky, infectious mess. This can lead to further complications and is why the Death Rate is so high.