1, antioxidant effect

Selenium is a component of glutathione peroxidase (GSH-Px), and each mole of GSH-Px contains 4 grams of atomic selenium. The function of this enzyme is to catalyze the redox reaction between reduced glutathione and peroxide.

Therefore, selenium can play an antioxidant role and is an important free radical scavenger (50-500 times that of vitamin E). In vivo, GSH-Px and vitamin E have different antioxidant mechanisms, and they can complement each other and produce synergy.

2. Prevent diabetes

Selenium is the active component of glutathione peroxidase, which can prevent the oxidative damage of islet β cells, make them function normally, promote glucose metabolism, reduce blood sugar and urine sugar, and improve the symptoms of diabetic patients.

3. Prevention of cardiovascular and cerebrovascular diseases

Selenium is an important element to maintain the normal function of the heart, which can protect and repair the heart. Scientific selenium supplementation has a good effect on preventing cardiovascular and cerebrovascular diseases, hypertension and arteriosclerosis.

The decrease of human blood selenium level will lead to the decrease of the function of scavenging free radicals in the body, which will lead to the increase of harmful substances deposition, the increase of blood pressure, the thickening of blood vessel wall, the decrease of blood vessel elasticity, the slow blood flow and the decrease of oxygen transport function, thus inducing the increase of the incidence of cardiovascular and cerebrovascular diseases.

Side effects of selenium:

1, acute selenium poisoning

Acute poisoning usually occurs after a large number of selenium-enriched substances are ingested, and daily intake of selenium as high as 400 ~ 800 mg/kg body weight can lead to acute poisoning.

The main manifestations are abnormal movements and postures, dyspnea, flatulence, high fever, rapid pulse, collapse and death due to respiratory failure. Most fatal poisoning deaths are preceded by intractable hypotension caused by direct myocardial inhibition and peripheral vasodilation.

Its characteristic symptoms are garlic or sour taste, nausea, vomiting, abdominal pain, irritability, excessive salivation and muscle spasm.

2. Chronic selenium poisoning

Chronic selenium poisoning is often due to the intake of 2400 ~ 3000 micrograms of selenium from food every day, and symptoms only appear after several months.

It is characterized by hair loss, nail loss, yellowing of skin, bad breath, fatigue, increased susceptibility to dental caries, depression and so on. Chronic selenium poisoning generally includes dizziness, headache, fatigue, metallic taste in the mouth, nausea, vomiting, loss of appetite, diarrhea, garlic smell in breath and sweat, hepatomegaly, abnormal liver function, autonomic nerve dysfunction and increased urine selenium.

Long-term high selenium makes children's body length and weight develop slowly, their hair is rough and fragile, and even nervous system symptoms and intellectual changes appear. The main characteristics of chronic selenium poisoning are hair loss and the change of nail shape.

Extended data:

Food sources of selenium

Foods containing selenium are: viscera and seafood 0.4-1.5 mg/kg; Lean meat 0. 1-0.4 mg/kg; Grain 0.01-0.04 mg/kg; 0. 1-0.3 mg/kg of dairy products; Fruit and vegetable 0. 1mg/kg.

The absorption and metabolism rates of yeast selenium, malt selenium and nano-selenium (beer yeast+sodium selenite) are low. The absorption rate of human body is only 40%-60%, and the rest is inorganic selenium residue.

Natural organic plant active selenium, such as 100 microgram plant active selenium (selenium-enriched corn flour), is a pure grain product that absorbs selenium from the soil improved by selenium-enriched technology.

Through photosynthesis and biotransformation in the growth process, it exists in the form of seleno-amino acids in the body, and the absorption rate of human body is over 99%, which not only meets the demand of human body for selenium, but also solves the problem of low absorption and metabolism rate of selenium.

Baidu encyclopedia-selenium