養生之道:每天喝3杯茶可以防止心臟病
Researchers say that drinking just three cups of tea a day can protect against heart attacks and stroke, according to a story in the UK's Daily Mail on October 9.
A new review shows regular drinking of either black or green tea can reduce the risk of heart problems by 11 per cent. It cuts the build-up of plaque in the arteries - a combination of dangerous fat and cholesterol.
The review by researchers at the University of Western australia says the benefits of tea are largely due to the flavonoid content, antioxidant ingredients that counteract cardiovascular disease.
One cup of tea provides 150-200mg of flavonoids. In terms of the delivery of antioxidants, two cups of tea is equivalent to five portions of vegetables or two apples.
Dr Jonathan Hodgson, co-author of the review, said "There is now consistent data indicating that tea and tea flavonoids can enhance nitric oxide status and improve endothelial function, which may be at least partly responsible for benefits on cardiovascular health."
Plaques in the carotid artery (a marker of atherosclerosis) have been shown to be less common in both men and women who drink tea. Bearing in mind the number of studies, including human trials, data demonstrates that flavonoids in tea can inhibit the development of atherosclerosis.
This review also highlights evidence from randomized controlled trials showing that tea consumption may improve the health of the inner lining of the blood vessels as well as evidence that tea may reduce the risk of high blood pressure and lower blood pressure.
Adding milk to tea doesn't affect the absorption of flavonoids from tea, according to several human research trials. In addition, the antioxidant effects seen in our blood following tea consumption are similar whether or not milk is added.
據每日郵報10月9日報道，研究者稱每天喝三杯茶可以防止心臟病和中風。
新研究結果顯示，經常喝茶(無論綠茶還是紅茶)可以使心臟問題減少11%。其主要機理是，喝茶可以減少血管中血栓的堆積。而血栓是由危險脂肪和膽固醇結合而成的。
西澳大利亞大學研究人員表示，喝茶的好處在很大程度上取決於茶葉中的類黃酮等抗氧化劑，這些物質有助於防止心血管疾病。1杯茶含類黃酮150—200毫克。在抗氧化劑方面，喝兩杯茶相當於吃5份蔬菜或吃兩隻蘋果。
研究成員之一喬納森•霍奇森博士表示，研究發現，越來越多的數據表明茶和茶葉類黃酮可以增強一氧化氮狀況，改善血管內皮功能，因此給心血管健康帶來好處。
經常喝茶的男女，動脈血管血栓明顯較少。多項研究（含人體實驗）得出的數據也表明，茶葉中的類黃酮具有控制動脈硬化症的功效。
新研究同時強調喝茶可以改善血管內壁健康狀況，又表明喝茶可以降低高血壓和低血壓帶來的危險。
多項人體實驗證明，喝茶時加入牛奶不會影響人體對茶葉類黃酮的吸收。另外，無論茶中加不加牛奶，喝茶之後人體血液中的抗氧化劑水平都不受影響。
