[Sorry Kaneki, while you might be willing to tiptoe around the vocabulary...Adrian is not, who comes right out with it as his tail sweeps the ground behind him.]

You ain't just gotta eat humans, no. You gotta eat 'em to survive...if you try not to forever, you'll go crazy and eat whatever moves.

[So basically: don't let that happen.]

You can eat whatever the hell you want, otherwise. Might be different ways to eat, dependin' on what monster you are, but most of the time it's just. Shove food in hole, just like anythin' else.