This is a GREAT idea..It works well with the idea of the game, And as stated add a level of realism..It would also open up VAST strategic options. Like the ones you stated. I also think that if they were to put this in the game, It would require the whole shabang if you will
. With pillaging, foraging, theft, and the other ways of food, Not to sure about cannibalism though. But who knows...Either way GREAT IDEA!