Selenium is an essential trace element for human beings and animals, and it is a component of glutathione peroxidase, which can eliminate free radicals in the body and protect the normal function of cell membrane. Recent studies have shown that selenium has the functions of anti-cancer, anti-cancer, heart protection, prevention and treatment of cataract, prevention and treatment of cretinism and Kaschin-Beck disease, and delaying aging. The daily intake of selenium is 50~200ug. According to the investigation of China Academy of Sciences, there are as many as 22 selenium-deficient provinces in China, of which 28% counties and cities are seriously selenium-deficient. Now most people in China live in a serious selenium-deficient environment. The United Nations Health Organization pointed out: "Dietary intake of selenium is the most ideal way to supplement selenium." Since then, it has opened a new chapter in global research on selenium nutrition and development of selenium-enriched functional foods.
Characteristics and nutritional function
A trace element with little demand from human body, but no small effect, has gradually entered the eyes of parents, because many experts are telling us that selenium deficiency is the main reason for the decline of teenagers' vision, and it is also one of the important factors for children from 0 to 7 to suffer from respiratory and digestive diseases repeatedly. Because the human body has little requirement for selenium, for example, in the revised standard of China Nutrition 1998, the daily dietary selenium supply is120 micrograms for 3 years old. 40 micrograms for 4 ~ 6 years old and 50 micrograms for 7 years old or older. It is difficult to supply selenium with simple drugs. It is feasible to strengthen the supply of selenium in food by various safe practices. For example, after adding selenium to the feed for laying hens, the eggs laid are more conducive to children's safe selenium supplementation. Selenium supplementation is very important for the normal development of children's eyes, especially those children who love reading, surfing the Internet and reading music to practice the piano. They generally have the problem of overusing their eyes, and selenium supplementation is particularly important for them. Myopia, amblyopia and other eye diseases are mainly caused by free radicals attacking the lens, which coagulates protein, and protein accumulates and precipitates in the lens, which eventually leads to lens opacity and various eye diseases. Selenium is an "antioxidant nutrient", which can remove free radicals in the lens and keep the lens transparent. In addition, the low blood selenium index may make children repeatedly infected with respiratory or digestive tract diseases, indicating that selenium supplementation can greatly improve children's immunity. Selenium supplementation should not be excessive, and food supplementation is the safest and most reliable. The main function of selenium in the body is antioxidation, and it plays an important role in an enzyme that destroys free radicals in the human body. Lack of it may lead to high incidence of heart disease and cancer, but if you eat too much, it will also lead to toxicity. Now there is selenium-enriched salt for sale, and many kinds of foods also contain selenium, so there is no need for special supplementation. Selenium in eggs is an organic selenium, and its absorption rate is as high as 80%, which is 1.6 times higher than that of inorganic selenium (sodium selenite, etc.). It has the functions of scavenging free radicals, stimulating immunoglobulin, protecting lymphocytes, enhancing immune function, delaying aging and promoting children's development and growth. It is a fortified nutritious egg integrating medical care, health care and high nutrition. Scientific selenium supplement should also pay attention to the right amount, and excessive intake of selenium is also harmful to human body.