In answer to your question, yes, hunger will go a long ways towards overcoming your mindset. Take for example the Donner party. These were pious, highly moral, God fearing people. The idea of cannibalisim was as unappealing to them as blaspheming the holy spirit, and yet when faced with certain doom, they overcame their mental barriers and ate the dead friends and family they'd been so closely socialized with. How hard was that!!!