喝咖啡是否有益于身体健康？

Narrator: First we heard medical studies saying that caffeine in coffee was probably bad for the heart， but recent research showed that coffee may be good for the cardiovascular system , that's left coffee lovers like Corrine Mckillop to wonder.

Corrine Mckillop: I'd like to know which it is. It's very confusing. Is it good or is it not good.
Narrator: Well a new study may explain the conflicting information. According to the research, coffee can be both good and bad. It all depends on you and which version of a gene¹ you have called 'CYP'.

Dr. Sean Kenniff: CYP is actually spelled 'CYP'. Researchers believe that about half of us are carrying a gene that allows the body to break down caffeine quickly. The rest of us have the type of gene that more slowly metabolizes the stimulant².

Narrator: In the study scientists discovered coffee drinkers with the faster version of the gene had no increased risk of heart disease, however, people with the gene that breaks down caffeine slowly had a significantly higher risk.

Dr. Kirk Garratt: When the caffeine circulates in your body for a long period of time, you might in fact experience adverse³ health consequences from that. Now all of us want to know the same thing.

Corrine Mckillop: Well. I'd like to find out what gene I have.

Narrator: Well, that's the bad news. There is a test to find out, but it probably won't be readily available for a while. So what to do until then, the answer, in a word - moderation. The study also found that people with a slower gene can limit their risk if they limit their coffee to one or two cups a day.

Dr. Sean Kenniff, CBS News.

1 gene   

n.遗传因子，基因

参考例句：

• A single gene may have many effects.单一基因可能具有很多种效应。
• The targeting of gene therapy has been paid close attention.其中基因治疗的靶向性是值得密切关注的问题之一。

2 stimulant   

n.刺激物，兴奋剂

参考例句：

• It is used in medicine for its stimulant quality.由于它有兴奋剂的特性而被应用于医学。
• Musk is used for perfume and stimulant.麝香可以用作香料和兴奋剂。

3 adverse   

adj.不利的；有害的；敌对的，不友好的

参考例句：

• He is adverse to going abroad.他反对出国。
• The improper use of medicine could lead to severe adverse reactions.用药不当会产生严重的不良反应。