what is the symbolic meaning of jack's obsession with hunting meat?

The hunting symbolizes that it is human nature to impose your will upon another creature and to prove your power over it. That there is a natural thrill and exhilaration of proving that you can outwit an animal and take it's life. This is why enemy soldiers are often called "beasts" or "savages" or "inhuman monsters". It is easier to kill or harm something that is on a lower evolutionary level rather than an equal.