When your hungry, the game appoints a number to you. As time goes by, your number grows larger, which means your growing hungrier. As you eat food, the number goes down. For an example, let's say you get hungry. So you start off at 250 points. As time goes by, it increases to 300...then 350...then 400...And so on. To cure your hunger, you have to eat of course, and get your number below it's starting point. The next sentences give an estimate of how many 'food points' each kind of food gives.

Apple - 15-30
Bread - 175-215
Apple Pie - 275-315
Roasted Meat - 350-400

It took me a while to figure these out, since I had to start measuring from when I was at starving point, so they might be off a bit. They aren't the exact numbers. :oP