caffeine

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.(咖啡因相当于两杯浓咖啡，足以扭转这种效果，因此一些骑自行车的人甚至眼球运动速度也加快了。)

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。)

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。)

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。)

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”。)

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。)

Caffeine can cause palpitations and headaches.(咖啡因能引起心悸和头痛。)

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。)

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。)

Cut back on caffeine and alcohol.(减少咖啡和酒精的摄入。)