Every time a survivor is sent out to a task, they consume an extra food.
Food gathering, building supplies gathering and survivor searching all had a random chance on them (though not a big range, just enough to varry the numbers a bit).
Im glad you enjoyed playing it! I didn't get chance to balance it any more, left it a bit to easy, but then most jokes just want one play through anyway in a game jam :), so that works for me :D