Green tea may help cancer-fighting
英语阅读是考研英语的重头戏，怎么复习?怎么训练?建议同学们采取英语朗读的方法每天练习10-20分钟，快速提升英语的阅读能力和听力水平！NEW YORK - Healthy subjects who received daily caffeine-free green tea extract capsules had an increased production of detoxification enzymes, which may provide some cancer-fighting benefits, study findings show.
"Concentrated green tea extract could be beneficial to those who are deficient in the detoxification enzyme and shouldn't be harmful for those who have adequate detoxification enzyme," lead investigator Dr. H.-H. Sherry Chow, of the University of Arizona, Tucson, said.
Genetic and environmental factors cause people to have varying levels of glutathione S-transferase (GST) enzymes. These enzymes may play a crucial role in helping the body defend against toxic and cancer-causing compounds, note Chow and colleagues.
Previous laboratory and animal studies found that green tea compounds, antioxidants called "catechins," activate these GST enzymes. Therefore, Chow's team investigated the effect that concentrated compounds from green tea would have on GST enzymes levels in 42 healthy adults.
Their findings are published in the medical journal Cancer Epidemiology, Biomarkers and Prevention.
For 4 weeks prior to the study, the non-smoking volunteers refrained from drinking green tea, taking supplements, or eating foods known to contain epigallocatechin gallate, a potential cancer-fighting antioxidant.
Over the next 4 weeks the volunteers took four capsules, each containing 200 mg of epigallocatechin gallate, every morning prior to eating. This provided the equivalent amount of epigallocatechin gallate obtained from drinking 8 to 16 cups of green tea daily, Chow said.
The researchers found that the detoxifying GST enzymes increased by 80 percent in the study participants with the lowest GST levels at the start of the study. Participants with medium or high GST levels had either no increase or a slight increase in GST levels.
The capsules used in this study were specifically made for clinical trial use. Chow cautions that commercially available green tea extracts are not required to meet the same strict concentration and purity standards.
Chow adds, "More clinical testing is underway to confirm the cancer preventive activities of green tea or green tea extract."
听力和书面表达通常是我们学生的弱项，希望大家在英语朗读的方法下，并结合实际情况安排练习，不要一味模仿别人，要在练习过程中及时总结经验，包括时间安排等，让自己的考研英语水平得到一个很大的提升！
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