Eating too much salt is harmful to health!
Huang Shiren, the bully landlord, robbed Xi's wine, and Yang Bailao was filled with grief and indignation. He drank a bowl of brine, which was used to pickle pickles, and died. High concentration salt solution can cause gastrointestinal mucosal injury, which can cause acute erosion and bleeding, dehydration of human tissues, and sharp increase of blood circulation, which can cause acute heart failure; There's no reason not to be fatal.
In order to illustrate the influence of salt on health, let's do an experiment: put salt water in a casing (for sausages), tie both ends tightly, and then put it in a glass of clear water. It won't take long for this glass of clear water to become salty. Finally, water inside and outside the casing is the same, and vice versa. Put water in the casing, and then put a glass of salt water, and finally the water in the casing will be salty. It turns out that this casing is a semi-permeable membrane. Of course, the meat inside won't come out, but the salt inside will come out. This is the principle of osmotic pressure in physics. When the concentration of substances in the solution on both sides of the membrane is different, the permeability of the membrane is open until the concentration of substances in the solution on both sides reaches equilibrium.
There is no doubt that eating too salty affects health. Salt is one of the essential foods for human body, so how much should I eat to meet the health requirements? The nutritionist's suggestion is 5 grams per person per day, a family of three people per day 15 grams, and it should be 450 grams for 30 days a month. But it should be noted that there is salt in soy sauce, salt in pickles, and a salted duck egg in the morning. The salt here cannot be ignored. Therefore, it is really difficult for the general public to master 5 grams of salt a day. Even nutritionists may not be able to turn their kitchens into chemical laboratories to determine how much salt they can only eat a day.
However, the Nutrition Society of China made a survey, which is of reference value. According to the survey, people in northern China consume about 15 ~ 18g of salt every day, while people in southern China consume about 10 ~ 12g of salt every day. It's simple. It seems that comrades in the north will reduce their salt intake by two-thirds, while compatriots in the south will reduce their salt intake by 1/2. Although it is not accurate, it is generally available.
Medical research has found that excessive daily salt intake can easily lead to cardiovascular diseases, so a low-salt diet is advocated. In addition, eating too much salt can also lead to upper respiratory tract infection. This is because high-salt diet can reduce oral saliva secretion and lysozyme, and the osmosis of high-salt diet weakens the role of upper respiratory tract mucosa in resisting disease invasion, leading to the infection of upper respiratory tract diseases. Eating too salty for a long time will also affect bone growth. Because both sodium and calcium are minerals, sodium will be recovered by the body before calcium when passing through the kidney, so excessive sodium intake will indirectly increase the loss of calcium in urine and affect bone development.