What kind of dates do you have? What is the role of each?

Scientific name: Zizyphus jujuba English name: Jujube or China Jujube (date is the English word for date Jujube). Classification: Dicotyledonous plants, Rhamnaceae. Also known as red dates, beautiful dates and good dates. Jujube is a mature fruit of deciduous shrub or small arbor plant jujube tree of Rhamnaceae. Jujube trees are widely cultivated in China, reaching Jinzhou and Beizhen in Liaoning Province in the north, with the largest output in Shandong, Hebei, Shanxi, Shaanxi, Gansu, Anhui and Zhejiang. The famous variety is Jinsixiaozao, with small fruit and high sugar content, which is produced in Laoling, Shandong, Cangxian, Hebei and Miyun, Beijing. In addition, there is jujube, also known as "hanging jujube", which is mainly produced in Bin County, Shaanxi Province. The fruit is large, weighing 30-40g, rectangular, thin-skinned, thick-fleshed, small in stone, sweet in taste and ripe in late September. Sihong jujube in Sihong, Jiangsu Province was proved by experts from Nanjing Agricultural University, Jiangsu Agriculture and Forestry Department and China Jujube Research Institute. Among more than 700 known jujube varieties in China, Sihong jujube has the largest fruit type. This variety is immune to jujube witches' broom and has better resistance to fruit shrinkage and anthracnose than other varieties. Jujube has been listed as one of the "five fruits" (peach, plum, plum, apricot and jujube) since ancient times, with a long history. The most prominent feature of jujube is its high vitamin content. A clinical study abroad shows that patients who eat jujube continuously recover more than three times faster than those who simply take vitamins. Therefore, red dates have the reputation of "natural vitamin pills". The classification of jujube varieties (1) is generally based on the annual average temperature 15 degrees, which is divided into two ecotypes: Nanzhao and Beizao. (2) According to the size and shape of the fruit ① According to the size of the fruit, it can be divided into jujube and jujube. Jujube such as Lingbao Jujube, Huizao, Zanhuang Jujube, Fuping Jujube, etc. Jujube such as golden jujube, seedless jujube, heart-shaped jujube and so on. ② According to the size and shape of fruits, they were divided into 6 categories. Jujube, such as golden jujube, seedless jujube, warm heart jujube, Miyun jujube and so on. Long jujube types, such as Langzao, Hu Ping Jujube, Junzao, Zanhuang Jujube, Guanyang Changhong, etc. Round jujube type, such as Zanhuang round jujube, round bell jujube, slow de round jujube and so on. ; Oblate, such as winter jujube and flower jujube; Ripped dates, such as goat's milk dates, gourd dates and mopan dates; Jujube with persistent calyx, such as persimmon top jujube and Wuhua jujube. (3) Classification by use This is the most commonly used classification method: ① Dry varieties. It is characterized by thick meat, less juice, high sugar content and fast drying speed. Such as golden jujube, Zanhuang jujube, broken jujube, Lingbao jujube, Langzao jujube and Xiangzao jujube. ② Types of fresh food. Its characteristics are thin skin, tender and crisp meat and sweet juice. Such as winter jujube, Linyi pear jujube, big white bell, honey pot and so on. ③ Dual-purpose varieties. It can be eaten fresh or dried in the sun or processed into candied dates and other products. Such as Mingshan jujube, Junzao jujube, Huizao jujube, Jinzao jujube, Hu Ping jujube and Banzao jujube. ④ Jujube varieties. It is characterized by large and tidy fruit, thick and loose meat, less juice, thin skin, low sugar content, large cell cavity and easy absorption of sugar juice. Such as Yiwu jujube, Xuancheng pointed (round) jujube, Guanyang long jujube and so on. 1. Jujube can improve human immunity and inhibit cancer cells: Pharmacological studies have found that jujube can promote leukocyte production, reduce serum cholesterol, increase serum albumin and protect the liver. Jujube also contains substances that inhibit cancer cells and even transform cancer cells into normal cells; People who often eat fresh dates seldom suffer from gallstones. This is because the rich vitamin C in fresh dates converts excess cholesterol into bile acids. With less cholesterol, the probability of stone formation is reduced. 3. Jujube is rich in calcium and iron, which plays an important role in the prevention and treatment of osteoporosis and anemia. Middle-aged and elderly people often suffer from osteoporosis during menopause, and teenagers and women at the peak of growth and development are prone to anemia. Jujube will have an ideal therapeutic effect on them, and its effect is usually incomparable to drugs; 4. It also has a good nourishing effect on people who are weak after illness; 5. Rutin contained in red dates is a substance that softens blood vessels, thus lowering blood pressure and preventing and treating hypertension; 6. Red dates can also resist allergies, remove odors, soothe the nerves, improve intelligence and brain, and stimulate appetite.