The kidneys play a key role in cleansing the body of toxins, regulating fluid levels and maintaining electrolyte balance. People with kidney disease, such as chronic kidney failure, kidney stones or nephritis, require a special diet to reduce the burden on the kidneys and support their normal function. A healthy diet for the kidneys involves limiting sodium, potassium, phosphorus intake and adjusting protein and fluid intake according to the patient's condition. In this article, we will outline the principles of a healthy diet for people with kidney problems.