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zoom RSS 緑茶で肺がん予防

<<   作成日時 : 2010/01/15 01:20   >>

なるほど(納得、参考になった、ヘー) ブログ気持玉 1 / トラックバック 0 / コメント 0

 お茶を飲むと肺癌の予防に役立つ可能性があるという台湾からの報告。
 喫煙者・非喫煙者に関わらず、1日1杯飲むと肺がんリスクが有意に低下する。ある種の遺伝子を持つ人が最もその恩恵を受ける。
 緑茶はアジアのツバキ科の植物の葉を乾燥させたもので、アジアで広く飲まれていて、アジアでは多くのがんの発症率が低く、緑茶が何らかの関係を持っている。
 緑茶成分のポリフェノールがガン細胞の発育を抑える。
 2009年7月に、オックスフォードの研究グループコクランは、150万以上の人々についての緑茶とガンについての51研究のレビューを出版し、がん予防の可能性には結論が出ていないと断定した。
 I-Hsin Lin博士の研究では、緑茶を飲まない人は、毎日少なくとも1杯以上飲む人に比べて5倍以上の肺がんリスクがある。喫煙者では12倍肺がんになりやすい。
 IGF1という遺伝子を持つ人では更にはるかに肺がんになりにくい。
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緑茶の医学的効用
http://kurie.at.webry.info/200912/article_36.html
緑茶が前立腺癌の進行を抑える
http://kurie.at.webry.info/200906/article_32.html
キノコと緑茶が乳がんを予防
http://kurie.at.webry.info/200903/article_33.html
緑茶の抗酸化成分がアルツハイマー病を予防する可能性/茶カテキン EGCG
http://kurie.at.webry.info/200806/article_1.html
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Page last updated at 09:26 GMT, Wednesday, 13 January 2010
Green tea 'may block lung cancer'
http://news.bbc.co.uk/2/hi/health/8453628.stm

画像Green tea
Experts believe it is the polyphenols in green tea that may make it beneficial
Drinking green tea may offer some protection against lung cancer, say experts who studied the disease at a medical university in Taiwan.
The latest work in more than 500 people adds to growing evidence suggesting the beverage has anti-cancer powers.
In the study, smokers and non-smokers who drank at least a cup a day cut their lung cancer risk significantly, a US cancer research conference heard.
The protection was greatest for people carrying certain genes.
But cancer experts said the findings did not change the fact that smoking is bad for health.

Daily cuppa

Green tea is made from the dried leaves of the Asian plant Camellia sinensis and is drunk widely across Asia.
The rates of many cancers are much lower in Asia than other parts of the world, which has led some to link the two.
Laboratory studies have shown that extracts from green tea, called polyphenols, can stop cancer cells from growing.

The best thing a smoker can do to reduce their risk of lung cancer, and more than a dozen other cancer types, is to quit.
Yinka Ebo of Cancer Research UK

But results from human studies have been mixed. Some have shown a protective effect while others have failed to find any evidence of protection.
In July 2009, the Oxford-based research group Cochrane published a review of 51 studies on green tea and cancer which included over 1.5 million people.

They concluded that while green tea is safe to drink in moderation, the research so far is conflicting about whether or not it can prevent certain cancers.

Reduced risk

Dr I-Hsin Lin, of Shan Medical University, found that among smokers and non-smokers, people who did not drink green tea were more than five times as likely to get lung cancer than those who drank at least one cup of green tea a day.
Among smokers, those who did not drink green tea at all were more than 12 times as likely to develop lung cancer than those who drank at least a cup a day.
Researchers then analysed the DNA of people in the study and found certain genes appeared to play a role in the risk reduction.
Green tea drinkers, whether smokers or non smokers, with certain types of a gene called IGF1, were far less likely to develop lung cancer than other green tea drinkers with different types of this gene.
Yinka Ebo, of Cancer Research UK, said the findings should not be used as an excuse to keep smoking.
"Smoking tobacco fills your lungs with around 80 cancer-causing chemicals. Drinking green tea is not going to compensate for that.
"Unfortunately, it's not possible to make up for the harm caused by smoking by doing other things right like eating a healthy, balanced diet.
"The best thing a smoker can do to reduce their risk of lung cancer, and more than a dozen other cancer types, is to quit."

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