Poisonous Dilemma

An innocent man wakes up in a place not even animals wants to live in, a filthy prison cell. Clueless to how he got there, he's desperate to escape and return to his family. Mysteriously, ever day he's offered a choice. A meal enough to satisfy him for a day and a key that might unlock the locks. Perhaps to freedom. Will he give in to indulgent or starve his way out.