評論
打印
The educational materials presented here
今天展示的教育材料
were developed by students and faculty
是由愛荷華州立大學營養學
of the department of food science and human nutrition
和人體營養學系的
at Iowa State University.
學生和老師提供的
Funding for this project was provided by grants
該項目的資金由
from the American Cancer Society Mid West
美國中西部地區癌癥協會
and the Lance Armstrong Foundation.
及蘭斯，阿姆斯斯壯基金會提供
The materials are intended for educational use
這些材料僅用于教學
and are not meant to provide medical advice.
并非用以提供醫療指導
We welcome your feedback about these materials.
歡迎大家對這些材料做出反饋
Please use the evaluation survey link on the homepage
請用主頁上提供的調查評價鏈接
to provide your comments and suggestions.
提交你們的評論和建議
Caffeine's role in tea, coffee and cancer.
咖啡因在茶，咖啡與癌癥方面所起的作用
Caffeine is found in many beverages and foods.
許多飲料和食物都含有咖啡因
This chart compares the amount of caffeine
這個圖表比較了咖啡因
found in coffee and tea.
在咖啡和茶中的含量
As you can see the coffee is significantly higher
可以看見咖啡所含的咖啡因
in caffeine content than tea.
要遠遠高于茶
The way coffee is prepared also affects the amount
沖制咖啡的方式也會影響
of coffee in the beverage. Black, white and green tea
咖啡因的含量，紅茶，白茶和綠茶
contains measurable amounts of caffeine.
含有不少的咖啡因
This may be surprising to some people
有些人也許會因此感到吃驚
who may think that green tea is caffeine free.
因為他們覺得綠茶中不含咖啡因
Decaffeinated teas have very low amounts of caffeine
不含咖啡因的茶含有極少量的咖啡因
and are a good alternative if you are interested in
這種茶是個不錯的選擇，如果你想
limiting your caffeine intake.
控制咖啡因的攝入量的話
The caffeine content in brewed coffee averages
每杯煮咖啡含有的咖啡因
between 100 and 200 milligrams per cup
介于100到200毫克
while the amount in regular tea
但普通茶中的咖啡因含量在
ranges from 40 to 100 milligrams.
40到100毫克之間
This chart lists a variety of beverages, foods
這個圖表列出了一系列飲料，食物
and medicine with their caffeine content.
及藥物的咖啡因含量
Note that caffeine content is not required to
請注意，咖啡因含量是不允許
be included on the food label, so finding the amount
注明在食品商標上的，因此要知曉
of caffeine in a product may take some research.
某個產品咖啡因的含量需要做一些研究
There are several websites where this information
有一些網站上能夠找到這類信息
can be found including those of the manufacturer
包括食品生產商
of the product and also the Mayo Clinic nutrition site.
梅約診所(美國一家醫院)的營養網站
Something that may be surprising
令人吃驚的是
is the amount of caffeine in 2 tablets
兩片特效止痛片中咖啡因的含量
of extra strength Excedrin; this is about the amount
因為含量差不多相當于一杯咖啡中的含量
provided in a cup of coffee and is delivered in 2 pills.
但兩片藥就含有這么多咖啡因
Now that you have an idea of how much caffeine is
既然大家已經對咖啡因在
in some popular beverages and foods,
一些飲料和食物中的含量有所了解了
let's take a look at how caffeine affects the body;
我們一起來看看咖啡因對身體的影響
caffeine stimulates the central nervous system.
咖啡因能夠刺激中樞神經系統
It makes you more alert and boosts energy.
可以提高人的警覺性，增加體能
For these reasons it is used in
因此咖啡因經常用于
many over the counter pain relievers
許多非處方止痛藥
such as Excedrin Migraine.
例如一種叫埃克塞德林的止痛藥
How much caffeine is considered safe?
多少咖啡因才算安全劑量呢
There is no standard for caffeine consumption
沒有固定的標準
however a range of 500 to 600 milligrams per day
但是每天攝入500到600毫克的咖啡因
is considered to be safe.
屬于安全范疇
This would be around 4 to 7 cups of strong coffee,
這就相當于4到7杯濃咖啡
3 to 4 grande Starbucks vanilla lattes,
3到4大杯星巴克的香草味拿鐵
9 to 11 cans of mountain dew
9到11聽激浪
or 6 to 8 small cans of red bull.
或者6到8小聽紅牛
