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How Do You Like Your Caffeine -- In Tea or Coffee?
Date:2013-3-4    Publisher:本站原创

How Do You Like Your Caffeine -- In Tea or Coffee?


 

By VOA
25 February, 2013

From VOA Learning English, this is SCIENCE IN THE NEWS in Special English. I'm Avi Arditti.

And I'm Faith Lapidus. Today, we report on caffeine and two popular drinks: tea and coffee. We tell about a study that found black tea is better for your health than coffee. We also tell about a separate finding that coffee drinkers may have a lower risk of oral cancer than other people. And we examine how climate change may affect one of the most popular kinds of coffee.

For years, caffeine has been the "drug" of choice in many cultures. Caffeine has been considered socially acceptable because it is found in drinks like tea or coffee. People who consume a lot of caffeine-based drinks may think they are addicted -- depending heavily on the substance. But if they stop using such drinks, they will experience only mild symptoms of withdrawal for a few days.

A coffee shop in Bangalore, India
The real addiction may be emotional. Many people claim they cannot start their day unless they get their "fix," which is, in many cases, a cup or two of coffee. Some people drink coffee throughout the day. Even young people who may not touch tea or coffee are still putting caffeine into their bodies when they have energy drinks, which have high amounts of caffeine.

Caffeine is a bitter substance found in coffee, tea, soft drinks, chocolate, kola nuts, and some medicines. It has many effects on the body, including helping to activate the central nervous system. This can make you more awake and give you increased energy.

America's National Institutes of Health says drinking two to four cups of coffee a day is not harmful for most people. But it warns that too much caffeine can make you restless, irritable and worried. It may also cause headaches, abnormal heartbeats and other problems. The NIH says women who are pregnant or breast-feeding should limit their consumption of caffeine. And it says caffeine may affect how the body reacts to some drugs and vitamins. It suggests talking with a doctor if you have questions.

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