I saw an episode on "Mystery Diagnosis" where this guy was getting insanely low blood sugar. He's measure out at something like 35. Turns out, he had a tumour that was kicking out some sort of hormone (a growth factor) that was making him over produce insulin like hormone. What was so bizarre is he developed a totally different looking face, big enormous wrinkles, looked like one of those funny chineese dogs with the wrinkly faces. Anyway, its not a normal tumour thing, but a low carb diet might have killed this guy.