For many of us, it is the rocket fuel that gets us going first thing in the morning.
对大家很多人来讲，早起第一件事就喝咖啡则好似火箭燃料一般，能让大家清醒起来动起来。
But one expert has argued that to get the maximum effect of caffeine, it's better to hold on a few hours - because coffee is most effective if consumed between 9.30am and 11.30am.
但有专家觉得，要想获得咖啡因的最好成效还要再等上些许时间。由于在上午9：30-11：30这个时间段喝咖啡才是效果最好的。
Steven Miller, a neuroscientist from the Uniformed Services University of the Health Sciences in Maryland, says it is best to drink coffee when the body’s levels of the hormone cortisol are low because caffeine interacts with the hormone.
马里兰州健康科学统一服务大学的神经学家史蒂芬·米勒觉得，最好在身体中的荷尔蒙皮质醇水平偏低时喝咖啡，由于这个时候咖啡因和荷尔蒙相互用途。
He explained that people who drink coffee when their cortisol levels are high – namely, between 8am and 9am – develop a tolerance to caffeine, meaning it becomes less effective.
他讲解道，当大家在上午8-9点中皮质醇水平较高时喝咖啡，身体对咖啡因有耐受性，并非非常有效。
Cortisol controls the body clock and causes people to feel wide awake, The Telegraph reports. The body’s levels of the hormone are usually high just after a person wakes up but start to fall about an hour afterwards.
据《每天电讯报》报道，皮质醇控制人体生物钟，叫人们感觉非常清醒。人体内的激素水平在刚刚睡醒后一般较高，但大约一小时后便开始降低。
Mr Miller argues that it is during this drop in cortisol levels that people get the most benefit from the caffeine in coffee – it gives them a boost as it encourages cortisol production when their cortisol levels start to drop and they do not become resistant to its benefits.
米勒先生觉得，正是由于这种皮质醇水平降低，大家从咖啡中所含的咖啡因获得了最大益处——因可以振奋精神，在皮质醇激素降低时刺激皮质醇产生，而且人体对咖啡因的吸收不会遭到皮质醇的抵制。
He explained that cortisol levels also peak at lunchtime and between 5.30pm and 6.30pm, meaning that these would also not be good times to drink coffee.
他讲解道，皮质醇水平在中午与下午5：30-6：30之间达到峰值，这也就意味着这两个时间段更不是喝咖啡的最好时间。
Writing on his blog he said: ‘If we are drinking caffeine at a time when your cortisolconcentration in the blood is at its peak, you probably should not be drinking it.
他在博客中写道：“假如当大家的皮质醇浓度在血液中达到高峰时喝了咖啡，那样你可能不应该在这时喝咖啡了。
‘This is because cortisol production is strongly related to your level of alertness and cortisol peaks for your 24 hour rhythm between 8 and 9am on average.
“这是由于皮质醇激素的生产与人的警醒度紧密有关，在一天24小时的生物钟里，早上8-9点皮质醇达到顶峰。”
He added that people who drink a coffee first thing in the morning, when their cortisol levels are naturally high, will soon find themselves needing to make their coffee stronger and stronger to get the desired effect.
他补充道，大家早起第一件事就是喝咖啡，他们的皮质醇水平自然就高了，非常快他们就会发现自己需要喝咖啡来达到所需的成效。
However, he did accept that cortisol levels at different times of day vary from person to person meaning that the best time of day to drink a coffee also differs between people.
不过，他确实同意每一个人在一天中的不同时间段所同意的皮质醇水平因人而异这个说法，即天天喝咖啡的最好时间也因人而异。
For example, people who get up very early may find their cortisol levels drop earlier than those of people who get up late.
比如，起的非常早的人或许会发现他们的皮质醇水平比那些起的晚的人的皮质醇水平降低的早。
He says it helps turn energy into sugar to be utilised by cells in the body and that it also plays a role in controlling the body clock.
他说，这能够帮助借助体内细胞把能量转化成糖，并且对控制人体生物钟也起用途。
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