It's going to be interesting, seeing Willy's blood test results in April after only a diet change. I've never been able to go that route because either the cat hates the food to the point of not eating at all or I have younger special needs fosters who have to have the usual cat foods. My vets have always suggested a special diet but all six vets I've worked with on CRF cats over the years have prescribed fluids also. With values as high as Willy's, we've started off with large amounts daily, tested the blood 4-6 weeks later, and then been able to cut back. However, if Willy is eating that well those toxins are not making him feel nauseated and that's great.