It has been confirmed that there are 18 kinds of essential trace elements related to human health and life, namely iron, copper, zinc, cobalt, manganese, chromium, selenium, iodine, nickel, fluorine, molybdenum, vanadium, tin, silicon, strontium, boron, rubidium and arsenic. Every trace element has its special physiological function. Although they are very rare in the human body, they are necessary to maintain some decisive metabolism in the human body.
1990, FAO, IAEA and WHO expert committee redefined the definition of essential trace elements for human body, and concluded that there are ***8 kinds of essential trace elements for human body, including iodine, zinc, selenium, copper, molybdenum, chromium, cobalt and iron; The elements that the human body may need are manganese, silicon, boron, vanadium and nickel.
Extended data:
The role of essential trace elements in human body;
Iron stores and transports oxygen. Iron deficiency can lead to iron deficiency anemia, decreased anti-infection ability and lead poisoning. Iron-rich foods include animal blood, liver, chicken gizzards, cow kidneys, black fungus, soybeans, sesame sauce and so on. In particular, iron contained in animal blood is most easily absorbed by human body.
Most people know that iodine deficiency can lead to goiter, but they don't know that iodine is closely related to human intelligence. Iodine can promote energy metabolism, physical fitness and brain development. Seafood is rich in iodine, such as kelp, shellfish, laver and iodized salt after artificial iodization.
Zinc can strengthen the immune ability of human immune system, which is related to taste, smell and immunity. It can regulate cell differentiation and gene expression, and maintain the structure and function of biofilm. Zinc deficiency will inhibit growth, make the body's immune function decline, and also cause dull taste and smell, growth retardation, sexual characteristics hypoplasia and so on. Lean meat, pork liver, chicken liver, egg yolk and kelp are all rich in zinc, and fish, shrimp and oysters are the most abundant in zinc.
Selenium has the functions of antioxidation, anti-tumor and improving immunity, and can prevent cancer, heart disease and other diseases. Selenium deficiency can cause Keshan disease (also known as endemic cardiomyopathy), Kaschin-Beck disease or myocardial lesions. Foods such as grains, eggs and fish contain a lot of selenium.
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