A hungry man versus a well fed man

We are know that a hungry can be a hardworking man, also dangerous when he is really hungry. But given enough motivation and the promise of reward, to feed his hunger pangs, a hungry man can be a dependable worker. Feed him 50% full and he wants more. Feed him 70% full and he will become more efficient and wanting more, but safer. A 70% full man will not want to risk his good fortune.

At 80% or