If you say no, then you've never been starving. It's not even like you have to kill them, just eat em.
EDIT: According to one of those Argentinian soccer players, it tastes like a browner, more tender beef. Maybe fat people taste more like pork.
2nd EDIT: We have genes that prevent the spongiform encephalitus that usually arises when other species eat their own species brain matter. So not only can humans eat each other's brains, we've evolved to do so. It probably comes from chimps, who eat other primate's brains all the time.