The kidneys are organs that are part of the urinary system. They filter the blood by eliminating waste products through the production of urine. They also maintain the water and mineral content of the body. Protecting your kidneys is essential. While it is impossible to completely prevent certain diseases, healthy lifestyle habits can reduce their risks. In general, being well hydrated (at least 2 liters per day) and controlling salt intake through diet and sports are beneficial for kidney function.