After analysis and identification, there are about 500 compounds in tea. Some of them are essential nutrients for human body. Such as vitamins, protein, amino acids, lipids, sugars and mineral elements, have high nutritional value for human body. Some of them are ingredients with health care and medicinal value to human body. Such as tea polyphenols, caffeine and lipopolysaccharide.
1. Drinking tea can supplement many vitamins needed by human body.
Tea contains many vitamins. According to its solubility, it can be divided into water-soluble vitamins and fat-soluble vitamins. Among them, water-soluble vitamins (including vitamins B and C) are directly absorbed and utilized by the human body by drinking tea. Therefore, drinking tea is a good way to supplement water-soluble vitamins, and drinking tea often can supplement the body's demand for multivitamins.
Vitamin C, also known as ascorbic acid, can improve human resistance and immunity. The content of vitamin C in tea is relatively high, up to 100 ~ 250 mg per 100 g of green tea, and the content of senior Longjing tea is above 360 mg, which is higher than that of lemon, citrus and other fruits. During the fermentation of black tea and oolong tea, the content of vitamin C decreased due to oxidative damage. Only a few tens of milligrams are left per100g of tea, especially black tea, with a lower content. Therefore, the higher the grade of green tea, the higher its nutritional value. Everyone can meet the daily requirement of vitamin C by drinking 10g of high-grade green tea every day.
Vitamin b 1 in B vitamins is also called thiamine, b2 is also called riboflavin, b3 is also called pantothenic acid, b5 is also called nicotinic acid, and b 1 1 is also called folic acid. Because fat-soluble vitamins are insoluble in water, it is difficult to be absorbed and utilized by boiling water. Therefore, it is advocated to "eat tea" properly to make up for this defect, that is, to make tea into ultrafine powder and add it to various foods, such as tea-containing tofu, tea-containing noodles, tea-containing cakes, tea-containing candy, tea-containing ice cream and so on. After eating these tea foods, you can get the fat-soluble vitamin nutrients contained in tea and give full play to the nutritional value of tea.
2. Drinking tea can supplement protein and amino acids needed by human body.
In tea, the content of water-soluble protein, which can be directly absorbed and utilized by drinking tea, is about 2%, and most of protein is insoluble in water and exists in tea residue. Tea contains more than 25 kinds of amino acids, among which isoleucine, leucine, lysine, phenylalanine, threonine and valine are six of the eight essential amino acids. There is also histidine needed for the growth and development of babies. Although the content of these amino acids in tea is not high, it can be used as a supplement to the lack of daily needs of human body.
Drinking tea can supplement the mineral elements needed by human body.
Tea contains many elements and trace elements needed by human body. The main elements are phosphorus, calcium, potassium, sodium, magnesium and sulfur. Trace elements are mainly iron, manganese, zinc, selenium, copper, fluorine and iodine. For example, the zinc content in tea is relatively high, especially green tea. The average zinc content per gram of green tea is 73 micrograms, and the high zinc content can reach 252 micrograms. The average zinc content per gram of black tea is also 32 micrograms. The average content of iron in tea is 123 micrograms per gram of green tea and 196 micrograms per gram of black tea. These elements play an important role in human physiological functions. Drinking tea regularly is one of the important channels to obtain these mineral elements.