Healthy China Fuxi Ankang

Nutrition experts have come to the conclusion through repeated experiments that the standard value of selenium in blood is 0. 10mg/kg. If it is lower than this value, selenium deficiency will occur. The distribution of selenium in China is extremely uneven, and about 72% of the areas are deficient in selenium, especially in parts of 15 provinces, autonomous regions and municipalities directly under the central government from northeast to southwest, which constitutes a "selenium-deficient area". The results show that the per capita selenium content in 29% areas of China is less than 0.02mg/kg, which belongs to the human extreme selenium deficiency population. The per capita selenium content in 43% areas is between 0.03-0.04 mg/kg, which belongs to the selenium-deficient population. Therefore, Chinese nutritionists have proposed that iodine should be taken as an important selenium supplement in China. The daily intake of adults is suggested to be between 50 and 250 micrograms, while the US government recommends between 200 micrograms. ..

With the improvement of people's living standards, three meals a day are inseparable from vegetables, and the average daily consumption is also increasing. Therefore, selenium-enriched vegetables are one of the best ways to supplement selenium. Selenium-enriched vegetables can not only supplement selenium, but also provide various trace elements and vitamins necessary for human body.

There are two main forms of selenium in selenium-enriched vegetables. One is inorganic selenium in the form of sodium selenite and sodium selenite. The other is organic pathway, such as cystine of selenium or methionine of selenium. The results show that sodium selenite has better anticancer effect than sodium selenite in the existing forms of inorganic selenium, which may be because sodium selenite participates in hydroxyl free radicals needed by human metabolism and has inhibitory and killing effects on abnormal growth of tumor cells. However, inorganic selenium such as sodium selenite in vegetables should not be too high. Substances with high inorganic selenium content are difficult to be absorbed by human body, but harmful to human body. Because inorganic selenium must combine with organic ligands in the intestine before absorption, it can be absorbed and utilized by the body, and the competition of multi-element inorganic selenium in the intestine is limited, which has a great influence on the absorption of inorganic selenium. Organic selenium, such as selenocysteine or selenomethionine in selenium-enriched vegetables, is metabolized according to amino acid metabolism pathway, participates in protein synthesis, and is easily absorbed or stored by human tissues. After being absorbed by human body, organic selenium can be quickly utilized by human body, effectively increasing the selenium content in blood. According to my research, inorganic selenium and organic selenium coexist in selenium-enriched vegetables. Whether it is organic selenium or inorganic selenium, it is safe to use it only within the recommended intake range. The daily selenium intake of adults should be above 50 micrograms, and not more than 400 micrograms a day.

Natural selenium-enriched vegetables generally come from selenium-enriched areas. Enshi, Hubei and Ankang, Shaanxi are selenium-rich areas in China, which are rich in selenium-rich vegetables. Artificial selenium-enriched vegetables need to apply selenium fertilizer to the roots of vegetables or spray selenium fertilizer on the leaves. Selenium-enriched vegetables can become selenium-enriched vegetables when their selenium content reaches a certain standard. According to the local standard DB6 124.0 1, the vegetables whose total selenium content in fresh vegetables is between 0.0 1 ~ 0. 10mg/kg are selenium-enriched vegetables.

There are a large range of selenium-deficient areas in China. In low selenium areas such as Beijing and other developed areas, the daily intake of selenium per capita is only about 70~80 micrograms. According to the survey, the level of selenium supplementation in China is in a sub-health state. It is inevitable to supplement selenium in vegetables. At present, it has been found that the ability of some main grain crops to absorb selenium in soil is: Chinese cabbage >; Rape > white radish > corn > potato > sweet potato > rice, so people should eat more green leafy vegetables and eat 500 grams of selenium-enriched vegetables every day.