@rosemarya, CKD patients are told to watch and limit sodium, phosphorus, and potassium. Sometimes they also need to limit protein. Some of the foods we are told to limit or avoid, usually because of high potassium content ailing kidneys no longer can filter and excrete efficiently are potatoes, tomatoes, dried beans, avocados, bananas, oranges, etc. High phosphorus drinks like dark colas should be avoided. Red meat should be limited or avoided and in some cases, as in mine, a low-meat or even vegetarian or vegan diet is recoommended.

Lately, though, some foods which were to be limited or avoided in the past now come in more kidney-friendly form like the lower-potassium baby potatoes or the Roma tomatoes. Also, my recipe collection addresses ways to prepare potatoes so there's less potassium in them.