depends on how much injected, you could just feel lightheaded or you might get yourself into an insulin induced coma, serious cases, yeah, one could die. There's a certain blood insulin level that the body can naturally compensate to maintain homeostasis, like I said before, depends on the injected amount. sidenote - Watch 'A Beautiful Mind', it shows the usage of insulin shock therapy (Deep insulininsulin coma therapy (DICTICT)) to "reduce" schizophrenia.
enhancement of specificity and subject specific language, correct terminology