My soon-to-be 17 year old kitty has been on YoungAgain (Zero, then Mature, now LID) for 3 1/2 years now... which was started to control what was thought to be diabetes at the time. After a very short time on insulin (less than a month), his numbers improved dramatically on this food, and Elvis has never showed diabetic signs since. But now my dilemma is he appears thin to me and doesn't like this food anymore. He was around 13.5 lbs when the diagnosis was made, and is now about 9.5. I don't like that I can feel his spine and hip bones, but he appears healthy in all other ways with the exception of occasional constipation, but then, if he isn't eating as much, that could be why. When I took him to the vet at the end of July, he wasn't hyperthyroidic (which was my fear), and all numbers from bloodwork were normal; teeth didn't seem to be bothering him either. When he doesn't have a BM for more than a couple of days, I give him Fancy Feast Classic with either some organic pumpkin or about 1/4 tspn. of Miralax and it does the trick. Now though, he seems to only want the Fancy Feast and no part of the hard Young Again food. I don't want to feed him just FF and can't afford cans of some of the other higher end canned foods. So now I'm looking for a top notch dry food I can try that is grain free and fairly low in carbs, or any suggestions on how I can get him to eat the YA. I would also like to know what I can give him that might put a little weight on him. I've heard about Old Skinny Cat syndrome... is that fact or rumor? Any guidance would be appreciated.