It's easy to quit eating when your food supply is dependent on a jailer whose interests would be served if you conveniently died without showing any marks of foul play....
...speaking of which...it is for that very reason that Edward II was dispatched by having a red hot fire poker shoved up his wazoo....not a mark on him...'twas a grievous mortal sin to kill the King....on a sidenote, he was removed from the throne by Parliament's passing what were called the Articles of Deposition in 1327...and it is from this that all subsequent laws governing impeachment were abstracted