Tea must be hot! Researchers at the University of Chicago Loyola University Medical Center recently said that tea can not drink cold, otherwise it will lead to kidney stones.
Professor of urology at Loyola University in Chicago, United States, said that after cold tea contains a large amount of oxalate, it will form small stones, block the ureter, increase the risk of kidney stones. In this regard, Professor Gao Lin, a specialist in urology at the Fourth Affiliated Hospital of Harbin Medical University, explained that about 80% of urinary tract stones are calcium oxalate crystals. Patients with stones should drink less tea and drink plenty of water.
For ordinary people, digestive juices will buffer the formation of stones, so the chances of drinking cold tea stones are much lower. However, tea is rich in oxalic acid, as a precaution, pay special attention to the amount and manner of drinking tea:
1, tea cooler, containing large amounts of oxalate, will form a small stone, and warm water tea leaching beneficial chemical ingredients than hot water full. Therefore, it is best to use tea with water at 70°C-80°C, and drink until the temperature drops to about 60°C. Must not exceed 70 °C, tea too hot will cause strong stimulation of the throat, esophagus and stomach, causing mucosal lesions. In addition, repeated brewing or brewing time is too long, tea polyphenols, vitamins, proteins oxidative degeneration, harmful microorganisms will increase.
2. Some people are accustomed to drinking hot water after the tea cools. If no tea is added during this process, the oxalic acid content in the tea will not change, so don't worry about it. However, heating water in the middle does not easily dissolve nutrients in the tea, and it is not easy to brew flavors.
3, do not drink tea on an empty stomach, otherwise there will be more oxalic acid absorbed into the body, the probability of forming stones is relatively high. Especially patients with stones, you can drink water or lemon thirst, because lemon contains a lot of sodium citrate, can prevent kidney stones.
4, should not drink too much tea every day. Generally healthy adults, 6-10 grams of tea a day, can be brewed 2-3 times. People who have a large amount of physical labor, consume a lot of energy, eat greasy food, and have a large amount of alcohol and tobacco, especially in high-temperature environments, or people who are exposed to toxic substances, drink a little more every day. According to the difference in male and female constitution, Xiao Bian summed up the tea suitable for men to protect the kidney and protect the liver, and women's beauty flower tea.