In recent years, many experiments have confirmed that there is a certain relationship between salt intake and the incidence of hypertension. Excessive salt intake in diet can cause hypertension. The World Health Organization (WHO) recommends that each person can prevent coronary heart disease and hypertension by taking less than 5g of salt per day. In China, it is stipulated that adults can meet the body's need for sodium by ingesting 6g of salt every day.
Salt refers to sea salt, well salt, mineral salt, lake salt and soil salt from different sources. The main component of salt is sodium chloride, and the state stipulates that the sodium chloride content of well salt and mineral salt shall not be less than 95%. China stipulates that the barium content should not exceed 20mg/kg. Too much magnesium and calcium in salt can make the salt bitter, and too high fluorine content can also cause poisoning.
According to an expert survey, there is a certain relationship between salt consumption and the incidence of hypertension. The more salt you eat, the higher the incidence of hypertension. Eskimos in Alaska have a low salt content, and basically no hypertension, while residents in northern Japan who have a daily salt content of about 20 grams have a surprisingly high incidence of hypertension.
Extended data:
Three functions of salt:
1, maintain the osmotic pressure of extracellular fluid
Na and Cl are the main ions to maintain the osmotic pressure of extracellular fluid. K and HPO4 are the main ions to maintain the osmotic pressure of intracellular fluid. In the total cation of extracellular fluid, Na accounts for more than 90%, and in the total anion, Cl accounts for about 70%. Therefore, salt plays an important role in maintaining osmotic pressure and affects the movement of water in human body.
2. Participate in the regulation of acid-base balance in the body.
Sodium bicarbonate formed by Na and HCO3 has a buffering effect in the blood. Cl and HCO _ 3 also have a balance between plasma and red blood cells. When HCO _ 3 permeates from red blood cells, the anions in red blood cells decrease, and Cl enters red blood cells to maintain the electrical balance. On the contrary, the same is true.
3. Chloride ions participate in the generation of gastric acid in the body.
Gastric juice is strongly acidic, with a pH of about 0.9 ~1.5. Its main components are pepsin, hydrochloric acid and mucus. The parietal cells in the gastric gland can secrete hydrochloric acid. Parietal cells transfuse HCO3 into the blood and secrete H into the gastric juice.
References:
Baidu encyclopedia-salt