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These large data sets allowed for
这些大规模的数据
a high level of statistical power to determine
在统计学上反映出了
correlations among dietary factors in disease occurrence.
饮食因素和疾病发生之间的关联，具有很高的说服力
The conclusion of the work was that
结论指出
consumption of caffeinated coffee, tea or caffeine
摄入含咖啡因的咖啡，茶
or caffeine intake alone had no effect
甚至咖啡因本身，都不会对
on risk of either colon or rectal cancers
患结肠癌或直肠癌的几率产生任何影响
in either men or women.
无论是对男性还是女性来说
Of interest the researchers did find that
有趣的是研究者确实发现
consumption of two or more cups of decaffeinated coffee
每天饮用两杯或以上脱咖啡因的咖啡
per day significantly reduced the risk of rectal cancers.
会显著降低了直肠癌的患病几率
As with all human studies it is not possible to determine
所有人的研究都很难指出
what specific components of coffee
咖啡中究竟是什么成分
may be responsible for these effects.
才能产生这些效应
Many lifestyle factors impact risk of cancer
很多生活方式的因素会影响得癌症的几率
and although the research factors these
尽管这个研究
into their statistical analysis
在统计分析考虑到了这些
it is not fully possible to
但是不太可能完全
eliminate the impact of these factors.
消除它们的影响
Now let's take a look at caffeine's role
现在让我们看看咖啡因
in tea, coffee and cancer.
在茶，咖啡，和癌症中的作用
How much caffeine do you consume daily?
你每天摄入多大量的咖啡因?
And why do you drink caffeinated drinks?
你为什么喝含有咖啡因的饮品?
Caffeine is found in several beverages and foods.
咖啡因存在于好几种饮品和食物中
This chart compares the amounts of caffeine
这个表对咖啡和茶中的咖啡因含量
found in coffee and tea.
进行了比较
As you can see coffee is
你们可以看到咖啡中的
significantly higher in caffeine content than tea.
咖啡因含量比茶里的高很多
The way coffee is prepared also
咖啡的制作方法
affects the amount of caffeine in the beverage.
也会影响其咖啡因的含量
Black, white and green teas
红茶，白茶，和绿茶的
also contain measurable amounts of caffeine.
咖啡因含量也很可观
This may be surprising to some people
一些认为绿茶不含咖啡因的人
who may think that green tea is caffeine free.
也许会感到很惊讶
Decaffeinated teas have very low amounts of caffeine
脱咖啡因的茶含有很少量的咖啡因
and are a good alternative
它是个不错的选择
if you are interested in limiting caffeine intake.
如果你想控制咖啡因的摄入
The caffeine content in brewed coffee
煮制的咖啡里所含咖啡因的量
averages between 100 and 200 mg per cup.
为平均每杯100到200毫克
While the amount in regular tea
而普通茶中的含量
ranges from about 40 to 100 mg.
约为每杯40到100毫克
This chart lists a variety of beverages,
这张图标列出了多种饮料
foods and medicines with their caffeine content.
食品和药品及它们的咖啡因含量
Note that caffeine content is not required
要注意的是咖啡因含量并不要求
to be included on the food label.
在食品标签上标出
So finding the amount of caffeine in a product
所以要想知道一种产品的咖啡因含量
may take some investigation.
可能要做一些调查
There are several websites
有几家网站上
where this information can be found
能找到有这方面信息
including those of the manufacturer of the product
它们包括该产品制造商的网站
and also at the Mayo Clinic nutrition website.
以及梅奥诊所的营养网站
Where does your favorite beverage compare?
你最喜欢的饮品有什么好处?
Are you surprised by where it falls
你会因其
in comparison to other products?
劣于其他产品而惊讶吗?
Something that may be surprising is
也许令人惊讶的是
the amount of caffeine in two tablets of
两片强效伊克赛锭所含的咖啡因
extra strength Excedrin is 130 milligrams.
有130毫克
This is about the amount provided
这相当于将一杯咖啡中的咖啡因
in a cup of coffee and is delivered in two pills.
转移到了两个药片里
Now that you have an idea of
既然你们已经了解了
how much caffeine is in some popular beverages
一些流行饮品中咖啡因含量
let's take a look at how caffeine affects the body.
让我们来看看咖啡因是如何影响身体的
