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When it enters the blood circulation system, it will stimulate the nerves, which will make people emotionally excited and keep the brain awake. Therefore, drinking coffee has a refreshing effect, and it is best to wait until the activity of cortisol in the body gradually declines (usually 1 to 2 hours after the peak), and the effect of caffeine will not appear. Steven Miller, a neuroscientist at Dartmouth-Hitchcock Medical Center in the United States, published in the Journal of Clinical Endocrinology and Metabolism in 2009 by the team of Professor Richard J. Ross of Sheffield University School of Medicine.
The experimental study on the circadian change of cortisol in Image Manipulation Service the previous study proposed that caffeine is combined with the biological clock, that is, the three cortisol secretions are from 9:30 am to 11:30 am, noon to 1:00 pm, and 5:30 pm to 6:30 pm Drinking coffee at a reduced time has the most refreshing effect. This conclusion coincides with my personal observation and experience. In recent years, many studies on the refreshing effect of coffee have also confirmed the relationship between this biological clock and the refreshing effect of coffee. I appreciate a cup of coffee with a light fragrance and light bitterness, and I like to talk about the development history of coffee globalization.
The students I have taught and my friends in the diaspora all know that I have a soft spot for coffee, and I will send coffee beans from the place where I live every once in a while. Coffee beans from Europe, South America, Africa, Malaysia, Indonesia, Vietnam, and Burma have the same aroma and different flavors. When you taste it slowly, the tip of your tongue will become more and more sensitive. Sometimes when I take a sip, although I can't clearly identify where it comes from, I can appreciate the sourness, bitterness, strength and lightness of each.