In a survival situation, it's not enough to be able to acquire a steady food source. If you only cook and eat the choice cuts of meat, you're throwing away key nutrients that could mean all the difference. For most of us the idea of eating some things is unpleasant, but in certain parts of the world these bits are considered a delicacy. Not because they taste good. In fact, if your palate isn't accustomed to them a lot of these things are hard to choke down. They're delicacies because at some point in the history of mankind they offered a nutritional advantage only afforded to those higher up on the social tier.