For many of us, it is the rocket fuel that gets us going first thing in the morning.

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.

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.

hormone:荷尔蒙      cortisol:皮质醇

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.

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.

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.

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.

Writing on his blog he said: ‘If we are drinking caffeine at a time when your cortisol concentration in the blood is at its peak, you probably should not be drinking it.

‘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.

alertness:警戒,机敏

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.

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.

For example, people who get up very early may find their cortisol levels drop earlier than those of people who get up late.

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.

每日英语:The best time for coffee is 10:30 a.m.的更多相关文章

  1. 每日英语:South India's Streetside Coffee Culture

    Early one morning last week I queued outside Sri Gopi Iyengar Coffee and Tiffin Center, a coffee bar ...

  2. 每日英语:Got 5 Minutes? 'Flash Fiction' Catches On

    Chinese author Lao Ma has a simple approach to his short stories: In the face of life, everything is ...

  3. 每日英语:Surviving a Conference Call

    The conference call is one of the most familiar rituals of office life -- and one of the most hated. ...

  4. 每日英语:15 places to find inspiration

    If you’re a writer or artist, you understand the power of location when it comes to creativity and f ...

  5. 每日英语:Tech Firms Flock to Vietnam

    Opening up a Korean restaurant among the rice fields and limestone karsts north of Hanoi might seem ...

  6. 每日英语:Secrets Of Effective Office Humor

    Margot Carmichael Lester loves making good-natured jokes at work. As owner of The Word Factory, a Ca ...

  7. 每日英语:A Better Way To Treat Anxiety

    Getting up the nerve to order in a coffee shop used to be difficult for 16-year-old Georgiann Steely ...

  8. 每日英语:The Secret About Online Ad Traffic: One-Third Is Bogus

    Billions of dollars are flowing into online advertising. But marketers also are confronting an uncom ...

  9. 每日英语:A Different Color: China's Chameleonic Politics

    China has tried your form of government and found it wanting. That was the message delivered by Chin ...

随机推荐

  1. Swoole源代码学习记录(十三)——Server模块具体解释(上)

    Swoole版本号:1.7.5-stable Github地址:https://github.com/LinkedDestiny/swoole-src-analysis 最终能够正式进入Server. ...

  2. lua闭包

    function MakeCounter() return function() t = t + return t end end local func = MakeCounter() , do pr ...

  3. quine

    发鸠之山,其上多柘木,有鸟焉,其状如乌,文首,白喙,赤足,名曰:"精卫",其鸣自詨(音同"笑").是炎帝之少女,名曰女娃.女娃游于东海,溺而不返,故为精卫,常衔 ...

  4. Windows 7系统如何设置计划任务?

    Windows 7系统如何设置计划任务? 问题描述:Windows 7系统如何设置计划任务? 任务计划概述:任务计划,可以将任何脚本.程序或文档安排在某个时间运行.“任务计划”在每次启动windows ...

  5. 【C#】Skip和Tack方法实现分页

    int pageIndex = SearchModel.PageIndex <= 0 ? 1 : SearchModel.PageIndex; return BatchInfoList.Skip ...

  6. 【HTML】 向网页<Title></Title>中插入图片以及跑马灯

    <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <style typ ...

  7. SQL SERVER 2008自动发送邮件(完整版)

    这两天都在搞这个东西,从开始的一点不懂,到现在自己可以独立的完成这个功能!在这个过程中,CSDN的好多牛人都给了我很大的帮助,在此表示十二分的感谢!写这篇文章,一是为了巩固一下,二嘛我也很希望我写的这 ...

  8. MySQL和ORACLE、SQL Server、PostgreSQL相比

  9. FreeSWITCH呼叫参数之sip_cid_type

    这个参数定义了呼叫中主叫信息的头字段类型.支持两种类型: 1. rpidRemote-Party-ID头,这是默认的设置.{sip_cid_type=rpid}sofia/default/user@e ...

  10. systemd的程序自启动脚本编写

    以FreeSWITCH的自启动脚本为例. 一. 编写freeswitch.service文件 [Unit] Description=FreeSWITCH After=syslog.target net ...