Caffeine can cause palpitations and headaches.

咖啡因能引起心悸和头痛。

Tea contains caffeine. It's bad for your health.

茶含有咖啡因，对你的健康不利。

It is a well-known fact that caffeine is a stimulant.

咖啡因是兴奋剂，这是人所共知的事实。

As little as 50 mg of caffeine can produce pharmacological effects.

仅仅50毫克的咖啡因就能产生药理效果。

Caffeine is the active constituent of drinks such as tea and coffee.

咖啡因是茶和咖啡这类饮品的活性成分。

Caffeine, a substance found in coffee and some soft drinks, is also a drug.

咖啡因，咖啡和一些不含酒精的饮料中的一种物质，也是一种毒品。

There could be less protein, more sugar and some additives you wouldn't expect, such as caffeine.

可能会有更少的蛋白质，更多的糖和一些你意想不到的添加剂，比如咖啡因。

Caffeine, the stimulant in coffee, has been called "the most widely used psychoactive substance on Earth".

咖啡中的咖啡因因被称为“地球上使用最广泛的精神活性物质”。

Theophylline, a close structural relative of caffeine and the major stimulant in tea, was one of the most effective compounds in both regards.

茶碱是咖啡因的近亲，也是茶中的主要兴奋剂，它在这两方面都是最有效的化合物之一。

In West Africa, people have long chewed kola nuts as stimulants, because they contain caffeine that also occurs naturally in tea, coffee, and chocolate.

在西非，人们长期以来都咀嚼可乐果作为兴奋剂，因为它们含有在茶、咖啡和巧克力中天然存在的咖啡因。

The caffeine, the equivalent of two strong cups of coffee, was sufficient to reverse this effect, with some cyclists even displaying increased eye movement speeds.

溶剂中的咖啡因相当于两杯浓咖啡，足以彻底改变这一影响，有的自行车手的眼动速度甚至加快了。

But Snyder et al point out that the caffeine concentrations needed to inhibit the production of phosphodiesterase in the brain are much higher than those that produce stimulation.

但 Snyder 等人指出，抑制脑内磷酸二酯酶产生所需的咖啡因浓度要比产生刺激的咖啡因浓度高得多。

Even caffeine, which is generally known only for its stimulatory effects, displays this property, depressing mouse locomotion at very low concentrations and stimulating it at higher ones.

就连人们通常觉得有刺激作用的咖啡因，也表现出了这种特性，它在浓度极低的情况下会抑制老鼠的运动，而在浓度较高的情况下则会刺激老鼠。

Caffeine consumption by children is associated with depression, sleep problems and obesity.

儿童的抑郁症、睡眠问题和肥胖问题与摄入的咖啡因有关。

Cut back on caffeine and alcohol.

减少咖啡和酒精的摄入。

The Caffeine Nap is simple.

咖啡式小憩很简单。

It is well known that caffeine is a stimulant.

众所周知，咖啡是一种兴奋剂。

To change your caffeine habit more gradually, try these tips.

要想逐渐克服你的咖啡因习惯，你可以试试下面这些方子。

If you're addicted to caffeine, then break the addiction first.

如果你很依赖咖啡因类饮料的话，你要先改掉这个习惯。

First, I must disclose that I'm biased. I love my caffeine.

首先，我必须说明，我是有倾向性的，我喜欢咖啡。

Skip caffeine after 3 in the afternoon for the same reason.

同样，下午3后就不要喝咖啡了。

The “white noise” (along with the caffeine) helps me focus!”

夹杂着‘白噪音’能帮我集中精神。

If you feel tired from drinking less caffeine, take a short nap.

咖啡喝少了疲倦的话，就小睡一会儿。

Growing evidence suggests a caffeine habit may protect the brain.

越来越多的证据表明，饮食咖啡因的习惯可以保护大脑。

I will get my energy from healthy food instead of caffeine and sugar.

我打算多吃健康食品，恢复精力，不再依赖咖啡和糖。

The question is, will Caffeine enhance performance or lead to user anxiety?

问题是，Caffeine是会提升性能，还是给用户带来麻烦？

Don't consume caffeine or alcohol within three or four hours of bedtime.

睡前三、四个小时就不要再喝咖啡或酒了。

Plus, if you're going the caffeine route, morning is the best time for it.

另外，如果你有喝咖啡的习惯的话，早上是最好的时间。

And even on a monophasic sleep pattern, caffeine is known to cause sleep problems.

即使是在传统的单相睡眠睡眠的状况下，喝咖啡依然会导致睡眠问题。