Explanation

"salt" (high sodium intake) is considered a significant contributor to renal failure

High blood pressure link:

Excessive salt intake can contribute to high blood pressure, which puts stress on the kidneys and can lead to kidney damage. 

Proteinuria:

High salt intake can increase the amount of protein leaked into the urine (proteinuria), a sign of kidney dysfunction. 

Progression of kidney disease:

For people with existing kidney disease, a high salt diet can worsen their condition and accelerate the progression to renal failure.