My very elderly cat (20 years old) has kidney trouble and has been on tablets and renal diet cat food for about two years. She's been doing fine on it but has recently taken a dislike to the food and is refusing to eat it. She licks off the gravy or jelly, then leaves the rest. I've tried mashing it up and adding extra liquid but she still turns her nose up. She's lost quite a lot of weight and seems determined to starve herself rather than eat the food. In desperation, I've given her normal cat food and she wolfed that down and demanded more. It's clearly the renal diet food she's objecting to, not a general loss of appetite. So, do I give her normal cat food, in which what are the consequences for her kidney problem, or do I keep trying the renal diet even though she's fading away before my eyes.