The main reasons for low salt diet in hypertensive patients include: 1, excessive salt intake leads to an increase in blood pressure: including high blood volume, high cardiac output, increased resistance of peripheral blood vessels, if the amount of salt in the body is too much, it will make the blood flow worse; 2, excessive salt intake leads to an increase in blood volume: when too much salt intake will increase blood pressure from a variety of mechanisms, such as changes in the brittleness of blood vessels; 3, salt itself is necessary for the body, for hypertensive patients to limit salt appropriately, generally limited to six grams to ten grams.