Try reading a book called "Healing the Kidneys 101" I not only found in informative but also encouraging. The author, Marie Stephens, very clear states that her work is only for information only and you should follow anything you read there with a Medical Professional. But it's good to know what's possible. Even so there are many CKD books out there and adjusting your diet is a good place to start. My week is spent mostly cooking kidney friendly recipes, in bulk that I then freeze, that I have taken from a book called "Kidney Disease Diet for Seniors on Stage 3", but I think it could be of help for stage 4 as well. Good luck Howard and success in the future.