Isotonic urine (urine concentration and dilution function is reduced): CRF (chronic renal failure) early renal function is reduced while dilution function is normal, with the aggravation of the disease, the kidney dilution function is also impaired, so that the final urine osmolality is close to plasma, urine specific gravity is often fixed at 1.008-1.012, called isotonic urine. So, what foods are suitable for patients with isotonic urine? The following is a list of foods that are suitable for patients with isotonic urine: It is advisable for patients with isotonic urine to eat foods with more carbohydrates and fats. Foods high in vitamins are appropriate; more fruits and vegetables are appropriate. Egg whites: A low-protein, low-phosphorus diet is needed to protect the kidneys, but it is also important to get enough protein. Egg whites contain a variety of healthy proteins and are lower in phosphorus than other sources of protein. Take one to two egg whites a day.