The salt sold in the market usually includes crude salt, refined salt, crystal salt and edible salt. Edible salt is usually made of rock salt and sea salt, and iodine is generally added. Every100g of refined salt contains 393 1 1 mg of sodium and 2 mg of magnesium. Rock salt comes from natural minerals during geological changes, and contains almost no other minerals except sodium and chloride. Sea salt usually comes from saline-alkali beach. Sea salt contains trace minerals, such as calcium, magnesium, potassium, bromide and other trace elements.

Salt action

Salt can provide a large amount of sodium. For human body, sodium plays a variety of vital roles. It can promote the metabolism of protein and carbohydrates, the spread of nerve impulses and muscle contraction, regulate the consumption of oxygen by hormones and cells, control urine production, thirst and produce liquids (blood, saliva, tears, sweat, gastric juice and bile). Salt is also very important for the production of gastric acid.

The seasoning function of salt Adding salt to cooking dishes can remove some peculiar smells of raw materials and increase delicacy, which is the refreshing function of salt. Among the numerous cooking raw materials, except for a few raw materials which have a more welcome and acceptable taste (such as cucumbers, tomatoes, fruits, watermelons, melons, cantaloupes, etc.), most raw materials have some bad taste to varying degrees. If they are to be turned into delicious dishes, we should give full play to salt besides heating and soaking? Eliminating evil and strengthening the body? Function.

So-called? Eliminating evil and strengthening the body? It is to inhibit the fishy smell of raw materials in the cooking process, help improve the fresh and delicious substances in raw materials, and enhance the delicious taste that people like. Many raw materials are flavored with salt before cooking, especially animal raw materials. For example, the sweet and sour pork in Cantonese cuisine, before frying the meat, the pork belly used must be flavored with cooking wine and salt. In addition to the sweet and sour seasonings, a certain amount of salt must be added to the sauce. If the salt is not added, the delicious taste of this dish will not be obtained. On the contrary, the smell of sugar and vinegar is highlighted, and the taste is very poor. This is the seasoning function of salt in cooking.

Tasteless, salty and tasteless, means that the amount of salt should be appropriate to play its unique function.

Harm of excessive edible salt to cardiovascular diseases

Many studies have confirmed that the intake of salt is related to the level of blood pressure. In the earliest animal experiments, it was found that high salt intake would raise blood pressure. Later, in many population epidemiological surveys, it was also found that if the salt intake in the diet increased, it would increase blood pressure; However, after reducing salt intake, blood pressure will decrease. The main component of salt is sodium chloride. Excessive sodium intake will cause adrenal gland and brain tissue to release a factor, which will increase the excitability of cells and make it easier? Excited? As a result, the arteries contract and blood pressure rises.

Salt liver and kidney diseases

Salt is also excreted through the kidneys and urine. In animal experiments, it is found that high salt intake will increase the amount of protein in urine; Later, further research in human body also found that high salt intake will also increase the protein content in urine, which is a dangerous signal of kidney function problems. Based on the comprehensive analysis of the population research evidence on salt and kidney diseases published from 1966 to 2004, it is concluded that high-salt diet will increase the burden on the kidney, lead to kidney damage, and may increase the risk of kidney diseases.

Salt osteoporosis

Salt contains sodium ions. It is found that the metabolism of sodium and calcium in human body is related, and they are regulated by the same molecule. When sodium ions are discharged from the human body, they will also carry some calcium ions, so the amount of calcium discharged will also increase. If you eat too much dietary salt, the increase in sodium excretion will also increase calcium excretion, and the urinary calcium level will increase, which may lead to bone thinning and osteoporosis, and also increase the risk of fracture. In addition, the increase of calcium ions in urine will increase the risk of kidney calculi.