Now that Mouldercrest's is basically a monopoly in upper, I think it'd be entertaining to make it very mildly addictive, with a +1 fort save bonus on eating, and a -1 fort save on withdrawal. This'd leave upper addicted to fast food, literally.
With Mouldercres'ts near monopoly, the standards of hygienes are bound to go down. Add a chance on reset that mouldercrest food stuff spread some vile intestinal bug.