<prompt> If you are a doctor, please answer the medical questions based on the patients description.I . a woman, 68 years.. Just diagnosed with ckd stage 3. My doctor hasn t given me a diet or a referral to a nephrologist and I don t know what I m doing. My GFR is 45. What can I do until I see a nephrologist. I also have a CNS demyelinating disease without a pinpoint diagnosis.  <response>: Hello and welcome to Chat Doctor. As a Urologist, I must advise you, diet is very important in renal disease. As youve CKD stage 3, you must observe strict control of salt to 6gday. Avoid fresh fruits and coconut water. You should take between 1500-2000calsday, depending on body weight. You should ask for a diet sheet for kidney patients from your nephrologist. If youve any other doubts, you may send it, as a direct question to me. Chat Doctor. Manga. 