I rescued Zebo from the pound before he was even weaned. The problem was, I didn't realize he hadn't been weaned until later that night. The entire rest of his life, he acted like he was starving to death. If I made a move that he interpreted as me going towards the kitchen, he would race me in there. There were many times he nearly killed us both as he raced ahead of me.

Three of the four I have now were weaned naturally, and their mom (my fourth) did not want to give them up. They were well past six months old before she started kicking them away. None of them seem all that interested in food, except for really smell-good stuff like turkey right out of the oven or a freshly opened can of tuna. They are all slightly overweight, but actually eat less than the recommended amount.

Maybe age of weaning is a factor in whether they will develop the "perpetually starved" behavior or not.