How many times is tea brewing to be healthy?
origin: life times
Mr. Li of Shenyang Reader: I heard that tea can scrape oil, I recently insisted on drinking every day. I found that after I finished my tea, I was very hungry. Did it play a role in losing weight?
Wang Xingguo, director of the Nutrition Department of Dalian Central Hospital, said: tea drinkers can easily feel the effect of tea on the stomach: hungry faster. This is because tea contains complex ingredients such as caffeine, theophylline and theobromine, which can stimulate gastric acid secretion and promote gastric motility. Increased gastric acid secretion (and accelerated gastrointestinal peristalsis) helps food digest, making people feel fat or greasy or feel hungry faster.
but do not think "fat free" or "hungry" is to lose weight, because drinking tea changes only the process and feelings of digestion, not the result of digestion. The energy you eat three meals a day, whether it is sugar, protein or fat, will not run away because of tea. It's clear that drinking tea doesn't change your food intake, nor does it change your fecal composition. It changes just the digestion process from food to feces, and how can it lose weight?
Puer tea and black tea stimulate the secretion of gastric acid stronger than green tea, so Puer tea is easier to drink. I have seen people suffer from stomachache (which is related to increased gastric acid secretion and damage to the gastric mucosa) and drink Puer to lose weight. There are also attempts to use caffeine to stimulate the role of tea to reduce weight. Caffeine is exciting, and energy consumption of basal metabolism is increased, so that it can lose weight. Caffeine does give people more mental power and higher motor function, but it has little effect on basal metabolism. So tea, coffee, caffeinated drinks and so on are not enough to achieve weight loss purposes.
the tea not finished is the most easy to form the tea scale
scientific research shows that the drinking water contains minerals and trace heavy metal ions, such as cadmium, mercury, arsenic, etc. When the water is heated, the solubility of some calcium and magnesium ions decreases with the increase of water temperature, and the concentration of refractory salts is increasing. When the water is concentrated to a certain extent, the precipitation is precipitated. These precipitates can come into the tea cup with the water washed tea and are not exposed to the air. The tea polyphenols and the metal elements in the tea rust in the tea will oxidize, produce brown tea rust, commonly known as tea scale, attach to the inner wall of the cup, and contain a lot of cadmium, lead, mercury and arsenic in the tea rust. Harmful metals are the main causes of human health. "
Li Hongzhu, an associate professor at the Tianjin Institute of medicine, said in an interview:" tea scales contain carcinogens such as cadmium, lead, mercury, arsenic and other toxic substances, such as nitrites, which will attach to the smooth surface of the tea cup. As the tea enters the body's digestive system, it combines with protein, fatty acid and vitamins in the food to produce insoluble precipitates, which not only hinders the absorption and digestion of these nutrients, but also damages the intestines and stomach organs. In addition, often do not wash tea cups, there are still more scale, which also contains a large number of heavy metals, which is extremely detrimental to health. At the same time, these oxides will also cause nerve, digestive, and urinary system disorders and dysfunction, even cause premature aging, especially arsenic and cadmium can cause cancer, cause fetal malformation and harm health.
the thicker the tea is, the harder it is to clean up. Therefore, daily cleaning and regular cleaning are equally important. Experts suggest that every time a person has finished drinking tea, even if there is no obvious tea stains on the tea set, they should be carefully washed so as not to accumulate too much.
(1) tea scour has not been cleaned for a long time, soaked in heated rice vinegar or soaked in baking soda for a day or night, and then washed with toothbrushes. It should be noted that if the purple sand pot is used, there is no need to do so. The purple sand pot itself has an air hole, and the minerals in the tea scale can be absorbed by these pores. It will serve to maintain the pot and do not cause harmful substances to "run" into the tea water to be absorbed by the body.
(2) tea cup and teapot are placed in a small spoon of orange powder or orange juice, which are filled with clear water for 2-3 hours, so that the tea scale and the tea set lose the adhesive force, it is easy to remove.
(3) add water to the teapot or tea cup, put it into the potato skin, heat it and boil it, then rinse it after cooling. It is easy to clean.
(4) when the use of metal tea septum, will be black because of the tea scale, such as medium detergent can not be washed out, soak with vinegar, or soak with bleaching agent can be easily descaled.
(5) smear edible salt on the inside, especially with tea scale. Then use the toothbrush to brush the cup vigorously, and then rinse it with clean water.
experts especially remind that it is best to scrub the scrubbing scrubbing tools, such as steel balls or clean balls, because they are easy to harm the enamel of the inner wall of the tea set, making it thinner and thinner. The later generation of the tea scale will easily penetrate into the deep layer of the tea set, and it is very difficult to thoroughly remove it. It is advisable for individuals to use soft brushes or toothbrushes and gentle cleaning cloth to clean them.
bag tea is best to brew only 1 times bulk tea, but do not exceed 3 times
in addition to the tea scale not clear harmful health, tea brewing several times to the most nutritious, the most healthy? 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 by the first soaking in 3-5 minutes. After second times, the remaining 10% of the nutrients are almost all analyzed. It's out. 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, the nutrients will have 60%-80% precipitation, after second times the second bubbles, there will be third times the 80%-90% nutrients precipitate, the leaching rate of nutrients will exceed 95%, then soaking down, already little nutrition It works.
as for experts, it is pointed out that repeated brewing of tea 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.
12 grams a day for
Chinese Academy of Agricultural Sciences Tea Research Institute deputy researcher Jiang Heyuan suggested that for ordinary people, a day to drink tea 12 grams, 3~4 times the appropriate. People who eat more greasy food and large quantities of alcohol and tobacco can increase their tea consumption appropriately. Pregnant women and children, neurasthenia, tachycardia, tea consumption should be reduced. Han Chi reminds us that with the popularity of kungfu tea, people drink tea more and more irregularly, which is very wrong. People drink tea as health care, but drinking hot tea will increase the incidence of cancer such as cancer of the esophagus. The best temperature for drinking tea should be around 60 C, not exceeding 70 C.
in addition, you can drink different tea at different time in the day: drink a cup of light green tea in the morning, refresh your mind, drink jasmine tea in the morning, make a pleasant fragrance, improve work efficiency, drink a cup of black tea in the afternoon, get rid of the spirit, get together with friends or family, and get a pot of Oolong or Pu'er in the evening. And it doesn't affect sleep.