tea after tea, tea scale not clean can be killed (Oriental IC/ map)
[b] tea [/b]
[b] bag tea best only 1 times, do not more than 3 times [/b]
in addition to the bad health, tea brewing several times What is the most nutritious and healthiest? A lot of people don't know.
some people like to brew the tea leaves until they can't taste. Some people rushed one or two times to change tea. Which of these two methods is correct? How much is a cup of tea brewing several times? Yin Junfeng, deputy researcher at the tea Institute of China Academy of Agricultural Sciences, said that some people like to drink light tea, some people like to drink strong tea, although the times of tea brewing and different people's tastes have a great relationship, but from the nutrient absorption, the bag tea is best only 1 times, and the bulk tea is more than 3 times.
he explained that tea polyphenols, tea polyphenols that can reduce blood sugar, caffeine that make the central nervous system excited, and a variety of amino acids, vitamins and other nutrients are contained in the tea. How much of these nutrients can be precipitated is very much related to the frequency of brewing. Generally speaking, the larger the particle size is, the slower the nutrient release rate. The smaller the particle is, the faster the precipitation will be.
compared with the bulk tea, the tea bag packed with tea in the process of processing and kneading fully destroys the leaf cells. The shape of the particles is small. The nutrients in the tea will be precipitated from 80% to 90% after 3 to 5 minute soaking. After second times, the remaining 10% left right nutrients are almost all precipitated. . Therefore, Yin Junfeng suggested that the best tea bags should be brewed once, not only in the absorption of nutrients, but also will not affect the taste and taste. Bulk tea, because of the larger particles, the first time to soaking the best time, should be in about 5 minutes, of which nutrients will have 60% - 80% precipitation; after second times the second bubbles, there will be 80% - 90% of the nutrients precipitated third times, the leaching rate of nutrients will exceed 95%, then soaking down, already little nutrition It works.
as for some experts, the repeated brewing of tea leaves will lead to leaching of harmful substances such as pesticides and heavy metals. Yin Junfeng said that although there is some truth in this statement, there is no need to worry too much. At present, most of the pesticides used in China's tea production are very low in water solubility, according to 10 grams per person daily tea drink, even 1 mg / kg of residue of tea, only 0.0001 mg of pesticide, is one of the thousands of points per day allowed by the WHO. The leaching rate of heavy metal lead in tea leaves is relatively low. As long as regular tea is purchased, its content will not exceed the national standard.