There has NEVER been a documented case of someone dying from "diet soda poisoning." There has never been any death being directly related to drinking diet soda. BUT, drinking regular soda, which is FILLED with sugar can kill you, it can not only cause not only diabetes, but obesity, which leads to death. And there are plenty of deaths due to obesity. Obesity is quickly becoming the leading cause of death in America, I would much rather have a drink with sugar substitute if given the choice.