Ok, real fast a couple of things. Hyperglycemia (that high blood sugar attack) can absolutely cause altered mental status, LOC and even death. It also doesnt take a lifetime to do that much damage. The person doesnt take their medication, eats fast food for all their meals and going to the bathroom is their daily exercise, it can happen as soon as the crow dude states. A vegan diet can be healthy for even a diabetic. Do a low carb high protein vegan diet. Also the carbs in a good vegan diet useally consist of complex carbs and fiber, so a low glycemic index. How do I know this? Heath care provider that is diabetic, vegan and now healthier than I have been since I was a teeny.
Lastly, dont dump on someone for calling it a diabetic attack. Unless they said they're in healthcare, its fine. Sorry to the Canadian crow guy, its painful to watch family slowly kill themselves.