I have two cats. One of them is slim and elegant and leaves food when it's had enough. The other, on the other hand, is frankly, massive. It is only about a year old. It cries loudly and persistently for food ALL day, and the only time the thing moves with any sort of alacrity is when anyone makes a move towards the kitchen. I KNOW it must be lying when it insists it's starving, but the problem is with three of us seldom all in the house at the same time, it manages to fox us all into thinking it hasn't been fed. Possibly just seconds earlier. Why is it eating like this? Just simple greed, or can cats have food issues?