Dr McDougall recently updated a lecture about Kidney Disease. I remember included a discussion about potassium and nutrients of concern.
How To Protect Them? https://www.drmcdougall.com/education/l ... y-disease/ - Recommends most energy for grains and flours (lower potassium). (~0:40m) - Plant heavy diets and potassium evidence discussed. (~0:43-45m)