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A meta analysis is a statistical comparison of
一项综合分析是
many separate research studies that provides
对许多项单独的研究而进行的统计比较
an overarching view of the relationships
这些研究提供对于
between a dietary factor and cancer risk.
饮食因素和癌症患病几率之间关系的总体印象
By combining all of the relevant studies
通过综合所有相关研究
a very powerful assessment
可以得出一个强有力的
of the data can be achieved.
数据评估
Based on several such meta analysis
基于几个类似的综合分析
it has been concluded that
人们得出一个结论就是
regular consumption of green tea has
定期饮用绿茶
a slight beneficial effect on
对于降低乳腺癌几率
reducing breast cancer risk.
有一丝益处
With increased green tea consumption
对于曾经患有乳腺癌的女性来说
more than 3 cups a day
每天3杯以上的绿茶
the rate of cancer reoccurrence was found
可以降低
to be reduced in women
癌症复发
with previously diagnosed breast cancer.
的几率
So the role for green tea in breast cancer
绿茶降低乳腺癌发病几率的作用
is relatively weak
相对较小
but clearly shows no increased risk
但这也很清晰地表明
associated with green tea consumption.
饮用绿茶不会提高患病率
A similar meta analysis has been done
还有一个类似的综合分析
to determine the role
研究了
for green and black tea consumption
饮用绿茶和红茶
in the risk of lung cancer.
对于肺癌患病率的影响
Researchers compared data
研究者们比较了
from 22 separate studies
22个单独的
that examined green and black tea consumption
考察绿茶和红茶
in lung cancer risk. From this analysis
对于肺癌患病率影响的研究数据，在这项分析中
the highest consumption of green tea was
最高的绿茶饮用量
associated with reduced risk of lung cancer.
与低肺癌发病率相关
In fact, green tea consumption of 2 cups per day
实际上每天两杯绿茶
was associated with an 18% decreased risk
能降低18%
of developing lung cancer.
肺癌患病率
Consumption of black tea did not provide
但饮用红茶
any protective effect against lung cancer.
对预防肺癌没有保护性作用
The American Institute for Cancer Research
美国癌症研究所
and the World Cancer Research Fund
和世界癌症研究基金会
recently collaborated with research scientists
近期与科学家合作
to evaluate the entire body of evidence
对饮食，营养摄入及体育运动
relating food, nutrition and
与癌症预防之间的关系
physical activity with the prevention of cancer.
进行全面评估
The resulting document shown here
我们现在看到的研究成果
was published in 2007
在2007年发表
and provides an excellent resource for
为人们理解
understanding the links between diet and cancer.
饮食和癌症之间的关系提供了极佳的参考
This information can be accessed
任何人都能在
by anyone at the AICR website.
美国癌症研究所的网站上看到这个信息
After reviewing all relevant data
在回顾所有
concerning the role of tea in cancer
关于茶叶对癌症患病影响的数据后
it was concluded that
可以得出结论
the evidence was too limiting
由于
in amount, consistency, or quality to clearly
在含量，一致性，或品质上的证据过于有限
associate tea with a preventative role in cancer.
人们难以将茶和预防癌症的作用清晰地联系起来
Therefore while studies with components of tea
所以尽管对茶成分的研究表明
suggest it plays a preventative role in cancer
茶有预防癌症的作用
much more research needs to be done.
仍然需要更多的研究
Let us turn our attention now to coffee.
现在让我们谈谈咖啡
This beverage has been consumed
人们饮用咖啡已经
by humans throughout history.
有很长一段历史了
It has been promoted for
咖啡对于人体健康
both positive and negative health associations.
既有益处，也有可能有害
Here is another question to ponder.
这里还有个问题要考虑
How much coffee do you consume daily?
你每天喝多少咖啡?
Why do you drink coffee?
你为什么喝咖啡?
