What should I eat less if I have nephritis (there is an old man with nephritis in my neighbor's house, help me consult)

I don't know what stage her illness has developed. What is the creatinine clearance rate or glomerular filtration rate now?

Staging of chronic renal insufficiency

Compensatory period of renal insufficiency: creatinine clearance rate CCR 80 ~ 50ml/min.

Azemia stage: creatinine clearance rate CCR 50 ~ 20ml/min.

Renal failure stage: creatinine clearance rate CCr 20~ 10 ml/min.

Uremia stage: creatinine clearance rate CCR < 10 ml/min.

When renal failure occurs, urine will decrease. If the kidney function is good, you can eat diuretic food such as melon, or make tea with corn stigma and melon skin. All these have certain effects.