I came up with a somewhat, dumb idea.
Defecating and Urinating.
Well, after you eat, you should have to go to the restroom a while later depending on what you ate (I.E. Needing to take a huge dump after eating a americanized portion of something) And if you don't you die after a long period of time. Also you can break the law by urinating/stuffting in public (On buildings) and civilians.
Somewhat of a stupid, yet intriging idea.