美国有线新闻 CNN 研究发现摄入过多咖啡因会增加引发偏头痛的几率

 

Caffeine works by stimulating¹ the central nervous system. It's been called the most widely-consumed drug in the world. But if you're among the 14 percent of Americans who suffer from migraines, a new study out of Harvard University says you should avoid having too much caffeine. So how much is too much? Well researchers found that among people who suffered from severe headaches from time to time, figure between 1 and 3 per week — drinking one or two caffeinated drinks a day did not seem to have much of an effect on their migraines.

But people who said they had three or more caffeinated drinks, like coffee, were more likely to get migraines on the days they drank that much. The study relied on people to report their own diets and it didn't detail how much caffeine was in each drink they consumed. A large cup of coffee, for instance, would have more caffeine than a small cup of tea. But the study's author called it an important first step in figuring out where the line is between caffeine consumption² and getting migraines.

1 stimulating   

adj.有启发性的，能激发人思考的

参考例句：

• shower gel containing plant extracts that have a stimulating effect on the skin 含有对皮肤有益的植物精华的沐浴凝胶
• This is a drug for stimulating nerves. 这是一种兴奋剂。

2 consumption   

n.消费，消耗，消费额，消耗量，结核病

参考例句：

• Consumption of oil has declined in recent years.石油消耗量在最近几年下降了。
• The meat was condemned as unfit for human consumption.这种肉已被宣布不适宜人们食用。