Trùng tiềm năngSome researchers claim tea acts as a mild germicide in the digestive tract to help prevent food poisoning and diseases like cholera, typhoid, and dysentery. "The antibacterial effects of tea have been well documented in Chinese scientific literature," writes Dr. Albert Y. Leung in Chinese Herbal Remedies. "Green teas have stronger effects than black teas. They are effective against many types of bacteria, including those that cause dysentery, diphtheria, and cholera. Tea in the form of a decoction was particularly effective in treating bacillary dysentery, amoebic dysentery, acute gastroenteritis (inflammation of stomach and intestine) and enteritis (inflammation of the intestine)." There are reports of its use against plague bacilli in Japan. Research on this point was sparked by an incident in a Taiwan restaurant in 1980. An entire table of diners, except for one man, got sick from eating contaminated shrimp. Curious as to why that person was missed, Professor E. Ryu of National Taiwan University investigated and concluded that it was because he was a heavy tea drinker. Then, in laboratory tests, Professor Ryu found that powdered tea added to agar plates of eight kinds of bacterial cultures (including those for dysentery, salmonella, cholera, staphylococcus) kept all but one from developing colonies of bacteria. Only the E. Coli developed some, but less than usual. Another test produced similar results, this time also on streptococcus bacteria. Black, green and oolong tea had the same effect. Tea drinking, particularly after a meal, is "a great contribution to prevention of a variety of contagious diseases," Professor Ryu concluded (International Journal of Zoonoses, no. 7, 1980, and, with Dr. C. Blenden and David Wendall. no. 9, 1982). Cuts can benefit from washing with tea. Washing with tea is thought to prevent breaking out on the face. It is a treatment for athlete's foot, and dried used tea leaves in socks prevent a recurrence. A home remedy for sunburn is tea. Chewed tea leaves placed on insect bites are said to relieve itching.Anything Bad About Tea?It has been said drinking over two cups of tea a day is not recommended for pregnant women and nursing mothers. Persons with irregular heartbeats are advised to be cautious, as should those with stomach ulcers for fear of stimulating too much stomach acid. But does tea have any bad effects on healthy people? To be avoided is consuming medicine with tea. Some of four hundred chemical compounds identified in tea might cause adverse reaction when combined with certain drugs. British researchers have been concerned that tea growing in soil with high aluminum content will transmit levels of it harmful to people with aluminum-related problems. But this is a specific question related to certain soils. Tea has some effect on solubility of iron and calcium, specifically in the ease of absorption into the body, according to a study at the University of Wisconsin. While iron is nutrient proved to be totally soluble, instant solubility was only 85 percent in green and oolong tea and 69 percent in black tea. Research is being done on how to overcome this drawback. The Wisconsin study discovered that addition of the enzyme tannase or lemon juice, increased iron solubility by 27 percent and that calcium by 24 percent. There seems to be some point in putting lemon in black tea. If one is to make anything at all of the above material, it must be that the time is just not ripe to draw any real conclusions as to what various teas are capable of, and which are best for you. However, on the basis of research thus far, some teas do stand out in certain respects. Here is a tentative summary of the claims made based on research to date: • Digestion • All kinds of anti-bacterial • All kinds but not fully confirmed cancer prevention • Green, oolong and Pu-erh for cholesterol • Green and oolong for blood vessels • Slimming oolong and Pu-erh • Tooth care • Green tea for longevity and aging • Green tea for fluoride to combat osteoporosis
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