Salt is not only useful, if you eat too much will result in damage. Firstly, Kidney disease, Your kidney defect of eating too much salt. Kidney, it have work hard and this make salt is eliminated from the body doesn't out. Secondly, This make High blood pressure. When the salt from the body has no salt in the blood high blood pressure. And the last one, When heart disease, high blood pressure. Makes the heart work harder (beat up) cause an increased risk of heart attack.