Right here and now, I think I'd pass on a human flesh snack.
My morality would argue to resist a meaty main course of man-flesh, even in a survival situation.
However, I think the phrase "NOTHING can prepare you... " etc may possess more than a tiny modicum of truth.
So until actually faced with the do or die situation in reality, I think it'd be almost impossible for anyone to pre-empt even their own final decision from the comfort of their modern life of ease and convenience. The survival instinct may be less prevalent and visible in today's society. Modern culture affords us the great luxury to possess morals and ethics. But don't get me wrong, here, I'm not saying everyone will automatically be drawn towards the 'eat' category. There may be a few who might answer that they would have a welcome nosh-up, but who would ultimately decide not to when faced with the bare situation...
(Lord of the Flies, anyone?)