Not knowing your specific situation I would tell you to get a second opinion. My first nephrologist said there was nothing to do but my Mayo Clinic doctors have a completely different opinion. Controlling blood sugar is important as the more sugar in the blood the more syrupy it gets and more difficult for the kidneys to filter. As far as sodium, potassium, phosphorus, etc. there are formulas to follow to learn your limits. When diagnosed 4 years my eGFR was 39 and it was 57 last week. My creatinine has also improved the same amount. SO diet is very important as far as I'm concerned and most experts agree. Best wishes.