Green Tea May Help Explain 'Asian Paradox'
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While smoking is a well-known cause of heart disease and lung cancer, the rates of these diseases have remained inexplicably low in Asian countries where smoking is common. But researchers say there is growing evidence that green tea is one piece of the puzzle. Writing in the Journal of the American College of Surgeons, Yale University researchers detail the body of evidence linking green tea to better heart health and a lower risk of cancer. |
No one is suggesting that smokers ignore the danger of the habit and simply drink green tea. But research indicates that the tea's high concentration of antioxidants called catechins may offer a range of health benefits, according to Dr. Bauer E. Sumpio and his colleagues at the Yale University School of Medicine in New Haven, Connecticut.
Antioxidants help quench molecules known as oxygen free radicals that, in excess, can damage body cells and potentially lead to disease. Free radicals are natural byproducts of normal body processes, but they are also generated by external sources like tobacco smoke.
In Japan, China and other Asian countries, it is a social custom to drink green tea, which is less processed-and richer in catechins-than the black tea commonly consumed in the West.
And it's possible that this habit helps explain the so-called "Asian paradox," according to Sumpio and his colleagues.
This paradox becomes clear when looking at global health statistics, the researchers note. For example, for every 100,000 U.S. men, 348 will die of coronary heart disease each year. The figure for Japanese men is 186, despite the nation's higher rate of smoking.
Coronary heart disease (CHD) develops when the arteries feeding the heart become hardened and narrowed due to the buildup of cholesterol-containing plaques on the artery walls. According to Sumpio's team, lab research suggests that green tea catechins-particularly one called EGCG-may help thwart the CHD process through their effects on "bad" LDL cholesterol.
The antioxidants may also help keep artery walls functioning smoothly, as well as inhibit blood cells from sticking together and forming clots.
Similarly, lab studies suggest that EGCG and other green tea antioxidants may block tumor formation or growth in a number of ways. This may, according to the researchers, help explain why the lung cancer death rate in Korea is unexpectedly low.
The rate of lung cancer death among Korean men is less than 40 per 100,000, versus 67 per 100,000 among U.S. men. The difference among women is more stark: 13 per 100,000 in Korea, compared with 45 per 100,000 in the U.S.
This is despite the fact that 37 percent of Korean adults smoke, while only 27 percent of Americans do.
The global disease patterns are not that simple, however; China has a higher CHD death rate than the U.S. and many other Western nations, and the rate of death from lung cancer is about the same among Japanese and American men. Green tea, according to Sumpio, is no substitute for kicking the smoking habit.
"Smoking cessation is the best way to prevent cardiovascular disease and cancer," he said in a statement. |
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Source: Journal of the American College of Surgeons, May 2006
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Green Tea Benefits Trivia:
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EGCG or epigallocatechin gallate is the most abundant antioxidant catechin in green tea. It is found in high amounts in this beverage as the green tea leaves undergo very minimal amounts of oxidation. EGCG in green tea has exceptional anti-inflammatory and immune strengthening properties. Read more about EGCG here. Green tea is often classified as one of the so-called 'superfoods' due to its wealth of health-boosting components that may help fight a wide array of ailments and diseases. 'Superfood' is the term used to describe foods with high antioxidant and phytonutrient content. Go here to find a list of 'superfoods'. Vitamin C is said to help the body absorb more of the antioxidant content of green tea. New studies have shown that taking citrus juices, like those of oranges and lemons, along with green tea enable more of the tea's antioxidants to remain after the digestion process is completed. Read more about Vitamin C here. Antioxidants in green tea help fight the ravages of free radicals that are seen as the source of many of today's debilitating diseases. Did you know that aside from the catechins that are so abundant in green tea, there are many other types of antioxidants? Discover them all here. Green tea is said to help in lowering calories and fighting fat. This seeming ability to aid in weight loss is attributed to the polyphenols found in the beverage. Read more about green tea's fat-fighting abilities here. The Japanese and the people from the Meditteranean have some of the world's longest life expectancy rates. And while the Japanese look to green tea as their favorite after-meal drink, the Mediterranean peoples love to have red wine after their meals. Green tea and red wine? Could any two beverages be any more different? Discover what makes red wine a healthy drink when taken in moderation here. The quality of the water used to brew the tea is very important. It is believed that the water used must be free of contaminants and contain enough oxygen to enhance the natural flavor of the tea. Teas made with pure water yield a crisp flavor and a clear brew that is aesthetically pleasant. Learn more about the health benefits of water here.
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