The CKF diet stands for "Chronic Kidney Failure". That diet alone can have gluten, but not whole grains like whole wheat, oats, etc. Basically, the whole grains have too much phosphorus and potassium. And when a person's kidney's are not functioning properly, they can not filter these products from the blood which causes an excess build up which will make them ill, and cause them to itch uncontrollably. Sodium increases fluid retention in the body, and creates more "water problems" (including drowning) when the person's kidney's are not removing the excess fluid by the natural elimination process. Most kidney patients have to take pills known as "phosphate binders" every time they eat. Phosphate/phosphorus is in ALL foods, even meats. Too much calcium in the body that isn't properly eliminated starts a calcification of the heart valves, and leads to Congestive Heart Failure. My FIL developed this complication. A CKF diet is extreamly limited and strict. And to add to that that what is needed for the recipes shared in this thread is to also eliminate all gluten, that makes it even harder.
My FIL was a kidney patient for several years and he was a severe diabetic. He underwent dialysis 3 days a week. In January 2007 it was discovered that he had developed liver cancer that could not be treated due to his kidney failure and heart problems. In February 2007 he chose to stop his dialysis and no longer follow his CKF diet. Basically, he decided to end his own life, and once he made that decision he ate and drank whatever he wanted, including a very large can of boiled peanuts after his last dialysis treatment. He went to dialysis on a Friday...that was his last one. The following Thursday (day after Valentine's day) he passed away. He did not want to be embalmed, so his funeral and burial was the day after he died. One Friday he was taking dialysis, the next Friday we were burrying him. What these people eat and drink combined with dialysis, etc. can literally be the diffrence between life and death.