Here's my analysis of Jafar.

Jafar is a man-eater.
I think deep down inside, he's angry at the human race.
Jafar was probably ill-treated as a young marshmallow, and it's very likely that people viewed him as food to eat.
Jafar's probably in self-denial, and eats others to convince himself that he isn't food.
It is my belief that the sooner Jafar accepts the fact that he is meant to be consumed, the happier he'll be.