It's not supposed to. I believe the intent with food has always been for it to be a source of conflict, a resource over which wars would be fought. If there's enough to go around that kind of defeats the point.
That's not necessarily the case.
To give a simplistic example, if the western half of Dwilight had 50% of the food needed to feed itself, while the eastern half had 200%, there would be more than enough to go around, but it would still cause conflict.
