A low-salt diet is good for preventing high blood pressure, kidney disease, heart disease and other diseases. 1. Preventing high blood pressure: Since salt mainly contains sodium ions and chloride ions, after entering the body, it is stored in the extracellular fluid and balanced with potassium ions stored in the intracellular fluid. When low-salt diet is practiced, the intracellular and extracellular fluids are balanced, and the blood volume of the body is normalized, thus preventing the appearance of hypertension. 2. Preventing kidney disease: When a low-salt diet is practiced, it will not cause sodium retention and thus will not burden the kidneys. Therefore, low-salt diet can prevent kidney disease. 3. Preventing heart disease: when low salt diet is practiced, the body will drink normal amount of water, which will not increase the burden on the heart area and keep it functioning normally. Therefore, low salt diet should be practiced as much as possible in life to maintain health.