Callie's mom said it all. Your kitty really should go to the vet. My Millie is seriously overweight and has been on a vet-prescription diet since October. She has successfully lost 3 pounds, with another 3-4 to go. It is slow-going, but a vet-monitored diet is the way to go. Andif there's some other underlying health issue, taking care of that may be all it takes.