So I had an idea after revisiting the game and this original comment of mine. With Food playing such an integral role in the late game stages as well as potential for causing early game mischief perhaps a Food Regen power up? Not one you get in game as loot but rather used via the "power up" menu at the start of a new game? If 1/2 food integers are possible in the background, have levels of .5, 1, and 1.5 food regen per round. Then place the cost of such at double the normal, so .5 regen would cost you 2 of your points, 1.5 would cost you 6. That would be the same as maxed out ranks on any two other stats such as Feats and Attributes. If that isn't enough, you could even move it to triple cost. It would add additional food use mitigation for those that really really want it while also keeping it balanced and not a true unlimited source of food.
Granted this idea is purely based on the idea that when you move the game checks for zero food PRIOR to any interaction that could add food or that if you have a total consumption greater than available it will still result in the zero food event.