Hello When you have chronic kidney disease, you need to make changes in your diet, including: Limiting fluids Eating a low-protein diet (this may be recommended) Restricting salt, potassium, phosphorous, and other electrolytes Getting enough calories if you are losing weight Your recommended diet may change over time if your kidney disease gets worse, or if you need dialysis. Best fishes to eat are tuna,mackerel and sardines. You can eat toor dal. Since you are already under the advise of a nephrologist,you must consult him for  giving or restriction of any diet. Reduce citrus fruits and coconut water as they have lot of potassium in it. Thanks