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See if you can ID me.
你是否能把我鉴别出来。
I`m an organic compound that`s found in several of the foods we ate. I`m naturally bitter in flavor and well known for stimulating the central nervous system.
我是一种有机物，存在于日常吃的一些食物中。我天生有点苦，并且因能刺激中枢神经系统而众所周知。
I`m caffeine, a substance with several benefits and drawbacks.
我是咖啡因，一种既有优点又有缺点的物质。
A couple of things you might not know about caffeine. One, people can get physically dependent on it.
关于咖啡因，有一些事情你可能不知道。第一，人们在身体上可能会依赖它。
It`s not considered as addictive as say illegal street drugs or alcohol, but people who are used to caffeine and suddenly stop drinking it can get headaches. They can become anxious or depress.
虽然这并不是非法的街头毒品或酒精，但那些习惯咖啡因的人会因为停止喝它而头痛。他们会变得焦虑或沮丧。
They can have a hard time concentrating.
他们很难集中精力。
Another thing about caffeine is that the U.S. Food and Drug Administration has a new warning out about it.
另一个关于咖啡因的事情是，美国食品和药品管理局对它发出了新的警告。
The alert focuses on pure powdered caffeine, something so potent that small amounts can cause an accidental overdose.
警告集中在纯粉末状的咖啡因，它们非常有效以至于少量都可能会导致意外过量。
The FDA says it`s aware of at least two people who have died from taking it.
美国食品和药物管理局表示，至少有2人因服用它而死亡。
Caffeine is everywhere -- in coffee, iced tea, sodas, even in some medications. It`s an stimulant that can make you feel more alert and give you that boost of energy.
咖啡因无处不在——咖啡，冰茶，苏打水，甚至在一些药物中都存在。这是一种刺激性物质，能使你更加警觉并提升能量。
It increases blood flow to the muscles, opens up your lungs. It gives increased performance.
它能增加肌肉中的血液流动，扩大肺活量，增强机体性能。
But when you consume too much of it, caffeine can cause major health problems. On average, most people can handle about 300 to 400 milligrams of caffeine per day. That`s about what`s in three to four six ounce cups of coffee.
但当你摄入过多的咖啡因就会导致健康问题。平均而言，大多数人每天可以摄入大约300到400毫克的咖啡因。也就是三至四盎司杯的咖啡。
What`s concerning these days is more and more products contain larger amounts of caffeine. Energy drinks, supplements, even powdered caffeine contains way more of the substance than any cup of coffee. For example, the FDA warns one teaspoon of powdered caffeine is equivalent to 25 cups of coffee.
如今越来越多的产品含有大量的咖啡因。功能饮料，营养品，甚至一些物质中含有高于任何一杯咖啡中的咖啡因。例如，美国食品药品管理局警告，一茶匙的粉末咖啡因相当于25杯咖啡。
When they take what they think is a dose, it`s 10, 15, 20 times what they`re expected.
他们认为是可以接受的剂量，其实是预期的10，15，20倍。
Consuming more than 1,000 milligrams of caffeine can lead to some serious side effects like an irregular heartbeat, nausea, tremors,insomnia, and in some rare situations, death.
摄取超过1000毫克的咖啡因会导致一些严重的副作用，例如不规则的心跳，恶心，震颤，失眠，在某些罕见的情况下甚至造成死亡。
So, beware of what you`re drinking. Best way to avoid caffeine overdose is to check the ingredients just to see how much caffeine you`re taking in.
所以，留意你喝的东西。避免摄入过量咖啡因的方法就是查看食品成分，看看你到底摄入了多少咖啡因。
译文属可可原创，仅供学习交流使用，未经许可请勿转载。
