营养：绿茶对你有益么? 简介 绿茶真的好吗？ 绿茶对你有什么好处？专家说的减肥作用是真是假？哪里的肉被减掉了？ 饮茶对心血管有好处么？还是专家说的自相矛盾？ Nutrition: Is green tea really good for you? From The Times February 2, 2009 Nutrition: Is green tea really good for you? Q&A: Amanda Ursell Q: My wife is insisting that we change to green tea for breakfast instead of my normal cuppa because it is good for us. I can't stand the stuff because it seems bitter, and I usually pour it on the pot plant when nobody is looking. Is green tea really as great as my wife says it is, and should I try to grin and bear it and gulp it down? A: I'm on your side here because I'm not keen on it either. But I have been told by experts from the exclusive green tea brand called Newby (available at Selfridges and served at the Dorchester, both in Central London) that, to lessen the bitter taste, all green tea should be made with water that's hot, not boiling, and to infuse for only 2 to 3 minutes before serving. Adding a little honey also apparently helps to take off any remaining bitter notes. Black and green tea comes from the same plant, Camellia sinensis. To make green tea the leaves are steamed immediately after harvesting and chopping. This stops an enzyme called polyphenol oxidase from oxidising the most powerful super nutrient in the tea plant, known as epigallocatechin gallate (EGCG). In a nutshell, green tea is full of EGCG, whereas black tea has very little. Research suggests that it may be worth working on your green tea brewing skills to raise your daily intake of EGCG to benefit your heart and waistline. According to scientists from Athens Medical School, sipping a cup of green tea has recently been shown in volunteers to widen the artery that runs from the shoulder to the elbow by 4 per cent within half an hour of drinking, suggesting a short-term benefit at least on large blood vessels. This may help to explain why studies looking at large populations of people appear to show lower rates of heart disease and stroke in those who drink four to five cups a day. As for your waistline, there have long been mumblings in the nutrition world of green tea having potential effects on fat-burning mechanisms in our bodies. New research in the Journal of Nutrition supports the notion, indicating that it could be fat around our tummies that is the first to be burnt off. The study, on 132 obese adults, showed that while all had the same calorie intake and did the same amount of exercise, those drinking green tea lost 2.2lb more weight (with larger reductions in abdominal fat) over 12 weeks than those who had only a caffeine-containing beverage. This is not an earth-shatteringly larger loss, but over a year losses could be in the region of 9.5lb. Over ten years it could, in theory, be the difference between being overweight or not. Scientists think that it may be EGCG that speeds up the rate at which fat is broken down in our bodies. Things are less clear when it comes to green tea and cancer prevention. Laboratory work has shown that extracts from green tea that include EGCG stop or slow down the growth of some cancer cells. Recent research also reveals that other super nutrients shut down a key molecule that plays a role in cancer development. As exciting as this sounds, Cancer Help UK explains that evidence from human studies has yet to prove that drinking green tea has a cancer-preventing effect in real life. Going green: the facts Supplements containing green tea extracts minus the caffeine are available (look for those containing Teavigo, a particularly high-quality extract; 01225 326448 for more information). Green tea ice cream and the new trifle created by Heston Blumenthal for Little Chef sadly will not give you the benefits of a mug of green tea or supplements. EGCG is converted into super nutrients called the aflavins and the arubigens during the oxidation of green tea. These powerful antioxidants also have heart-protecting effects, so a cup of black tea with milk is still a healthy option. 查看更多0个回答 . 5人已关注
第1天
关注盖德视界
添加小助手
