14% of Australians have some form of kidney damage. High blood pressure, caused by salt, contributes to kidney damage because of the harm it does to blood vessels. For the same reason, once kidney damage has occurred, high blood pressure accelerates its progression towards kidney failure.
A kidney stone is a hard mass formed in the kidney from crystals in the urine. Urinary crystals can be caused by high levels of certain substances (such as calcium oxalate or calcium phosphate) in the urine, an uneven balance of acid in the urine, or, a lack of substances that inhibit crystal formation in the urine. Kidney stones may cause pain, nausea, vomiting, fever, chills, weakness, and cloudy, bloody or blocked urine.
A high salt diet may contribute to the likelihood of developing kidney stones due to the relationship between salt and the body’s ability to absorb calcium. Too much salt reduces the body’s ability to absorb calcium, leading to its loss through urine and a greater risk of developing kidney stones.