I have a cat with the same problem. It is a little different in that I have to isolate her to feed her because my other two want to jump in on the feast. Our vet has suggested that if she starts to lose weight, that we have her checked for hyperthyroidism so think that is a great recommendation. And although our cats really believe we live to serve them, we are still the boss! Good luck and I hope your kitty is just greedy and not afflicted with diabetes or hyperthyroidism!