1.The intake of protein. The protein intake should be based on the degree of renal impairment. If the disease course is long and the kidney damage is not severe，it is unnecessary to strict control the protein in diet.But the protein intake can not more than 1g/kg weight a day ,high quality protein need to reach more than 50%.
2.Due to parts of the patients limit the protein，carbohydrate and fat as the main source of the supply of the heat energy. The heat supply should be based on the level of labor intensity.For the resters，adults can be supplied with 126-147kJ(30kilocalorie-35kilocalorie)/kg weight.Besides,it should also meet the patient’s needs.
3.Control the intake of sodium salt.When patients occur severe edema and high blood pressure ,the intake of sodium salt should control within 2g even give salt-free diet ,commonly the low-salt diet is better .
The food for chronic nephritis patients:
1.They need plenty of vitamin，especially vitamin C. Because long-term chronic nephritis patients will occur anemia,vitamin C can increase the absorption of iron. So patients should eat the food which contains iron such as tomatoes，green vegetables，fresh Chinese-date，watermelons，carrots，cucumbers，oranges，kiwi fruit and natural juice.
2. Patients with poor appetite should take Vitamin C preparations. Meanwhile they should often take the food which contains rich vitamin B and folic acid ,such as animal organs，green vegetables which can correct anemia .When patients occur hyperkalemia should avoid eating high potassium foods and should be cautious to choose vegetables and fruits. Chronic nephritis patients should not to eat carbohydrate drinks and excitant food .
The disease may remit spontaneously and this kind of disease accounts for 4%-20%.About 1%-2% of patients will develop into end-stage renal failure every year.The life table shows that kidney survival rate of 10years is 80%-90%,the patients whose disease develop into uremia may be nearly 35%.Others are constant proteinuria or hematuresis. The negative factors of prognosis including : renal insufficiency will take place when the disease occurs，proteinuria exceeds 1.5g/d，high blood pressure and no gross hematuria ;renal biopsy shows the glomerular sclerosis and interstitial fibrosis happen，glomerular capillary is damaged，diffused proliferation and diffused crescent form take shape.