In an emergency, food is way down the list as a requirement. You can live for a month without it, although you'd be darned uncomfortable.
A month without food outdoors during hunting season? You won't starve to death in a matter of days but you'll be colder and thinking much less clearly than if you had a few calories in your pack. I always pack something in the way of extra food, calorie dense and compact. If nothing else it supplies energy for that long walk back to the truck or camp in the dark. Which in turn will help me bounce out of the sack the next morning at 4:30 and hit the trail.
