But if you feed a quality food such as orijen, you are already giving them quality proten. Food with things such as chicken meat meal, fish flash and eggs are good. The problem is, if they are only eating tiny amounts of renal food as they don't like it, they aren't getting enough sustainence. Willow barely weighs 2.5kg in fact my old vet said if her weight dropped any lower, it would be a problem. The main thing is getting food into them. The latest reports are saying that the restricted protein theory is based on humans and tests with rats. A few sites say that muscle wastage can be caused to supply the organs with protein and there can even be organ damage over time. I just try to keep a happy medium and compromises have to be made. I don't think it is worth extending a cats life it is unhappy? - I have been mixing rrenal with regular + adding renalzin but they still won't eat it so settled for regular or senior food with renalzin in - clapton is also happy to eat the mix with renal biscuits added + extra water.