Hey, we can give you a million reasons why you shouldn't eat human meat right now (illegal, disgusting, probably high-calorie), but this video by AsapSCIENCE about cannibalism outlines the horrifying things that would happen to your body if you were to eat only human flesh.
Yes, only human flesh. No side salads on those plates.
Hey, we probably don't have to tell you this, but don't do it! Don't eat people! Don't even think about eating people! Apparently, it doesn't even taste good. Oh, and another downside beside the taste? There's a good chance you will go crazy and die. That probably counts for something, too.