最佳喝咖啡时间：上午10:30_BEC初级作文

最佳喝咖啡时间：上午10:30

Steven Miller, a neuroscientist at the Uniformed Services University of the Health Sciences in Bethesda, Maryland, argues it is better to then drink caffeine after this peak as it promotes cortisol production.

He said that drinking coffee while levels of this hormone are high can cause people to develop a tolerance of the caffeine it contains, meaning they often need an extra shot in their morning cup to get the same effect.

Writing as part of a light-hearted look at the evidence 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

“One of the key principles of pharmacology is use a drug when it is needed. Otherwise, we can develop tolerance to a drug administered at the same dose.

“In other words, the same cup of morning coffee will become less effective and this is probably why I need a shot of espresso in mine now.”

Mr Miller, a neuroscience PhD student, wrote the advice after examining the evidence for how cortisol changes through the day.

Cortisol, which is produced in high levels in times of stress, helps to convert stores of energy into the sugar glucose so that it can be used by the body’s cells.