question: Hi Dr. Grief,I am a heart patient. I was on dialysis for a brief time after open heart surgery. I am now considered moderate CKD . I have regular blood work. My GFR is 41%. Of course, I would like to do I can do to at least stay at this level. Should I follow a special diet? My Potassium is 4.4., I am not overweight.Thanks for your answer.Gabrielle