誰在線上
現在有 361 訪客 在線上
| 綠茶可以抗血癌 |
 |
 |
|
綠茶可以抗血癌 一份在日本新的研究報告指出每天飲用五杯以上的綠茶可以降低50%罹患血液還有淋巴癌的機率。與一天只喝一杯的人相較之下，一天喝五杯綠茶的人會降低42%的血液惡性腫瘤罹患率，48%的淋巴癌罹患率。綠茶有30至40%可水解的多酚，紅茶(綠茶是由發酵製成的)則只有3至10%。而烏龍茶是半發酵製成的所以介於紅茶跟綠茶之間。在新鮮的茶葉裡找到的多酚有四種---表沒食子兒茶素沒食子鹽(epigallocatechin gallate，EGCG)，表沒石子兒茶素(epigallocatechin，EGC)、表兒茶素沒食子酸(epicatechin gallate，ECG)和表而茶酸(edicatechin，EC)。在一份長達九年的研究裡，採集了157份血液惡性腫瘤的樣本，包括了119份淋巴瘤還有36份骨髓瘤。分析結果顯示患者每天飲用超過5杯的綠茶比每天飲用一杯的患病機率低，並且跟性別還有體重沒有直接的關係。即使研究結果不能顯示病因，但與其他的研究證實綠茶的健康效用和成份。
Green tea may protect against blood cell cancer Drinking five or more cups of green tea per day may reduce the risk of blood- and lymph-based cancers by about 50 per cent, says a new study from Japan. Compared to people who drank only one cup per day, five cups of green tea a day were associated with a 42 per cent reduction in hematologic malignancies, and a 48 per cent risk reduction in lymphoid neoplasms, according to findings published in the American Journal of Epidemiology. The study, led by Toru Naganuma from Tohoku University School of Medicine in Japan, adds to the ever-growing body of science supporting the anti-cancer benefits of green tea and its polyphenols. Green tea contains between 30 and 40 per cent of water-extractable polyphenols, while black tea (green tea that has been oxidized by fermentation) contains between 3 and 10 per cent. Oolong tea is semi-fermented tea and is somewhere between green and black tea. The four primary polyphenols found in fresh tealeaves are epigallocatechin gallate (EGCG), epigallocatechin (EGC), epicatechin gallate (ECG), and epicatechin (EC).
Study details Naganuma and his co-workers followed 41,761 adults participating in the Ohsaki National Health Insurance Cohort Study. A questionnaire completed at the start of the study allowed the researchers to quantify green tea consumption. During nine years of follow-up, the researchers documented 157 hematologic malignancies, including 119 cases of lymphoid neoplasms and 36 cases of myeloid neoplasms. The risk reductions observed for people who drank five or more cups a day, compared to those who drank only cup, was not affected by the gender of the participants, or their body mass index. While the result does not prove causality, it does support other studies which reported a protective effect of green tea and its constituents. Being an epidemiological study, no measures were made of the polyphenol content of the tea consumed, and no mechanistic study was performed to identify the active component or components of the beverages. Global tea market The global tea market is worth about €790 (£540, $941) million, with green tea accounting for about 20 per cent of total global production, while black tea accounts for about 78 per cent. Consumer awareness of the benefits of green tea and green tea extracts continues to rise with growing numbers of studies, from 430 papers in 2000 to almost 1500 in 2003, reporting benefits of the main compounds, catechins. This has seen European demand surge, having reached 500 metric tonnes in 2003. Companies such as DSM, with its Teavigo boasting 95 per cent purity of epigallocatechin gallate (EGCG), and Taiyo International, with its Sunphenon claiming more than 90 per cent purity, position themselves firmly in specific catechin markets. 資料來源: American Journal of Epidemiology
NutraIngredients-USA.com 資料來源：
|
Our team
