Scientific research shows that drinking coffee at different times has different effects: drinking coffee in the morning is more positive.

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Coffee is used by office workers to cheer up their buddies. For a typical adult, the recommended limit for healthy caffeine intake is 300 to 400 milligrams per day, which can lead to side effects such as insomnia, anxiety, palpitations, stress and night sweats. In fact, if you want to drink coffee wisely, you have to not only control the amount of coffee, but also choose the right time, because according to a number of scientific studies, caffeine intake at different times has different effects.

Early morning (before 8 a.m.): evoke positive emotions

From a physiological point of view, though, caffeine intake doesn't have much effect at this time, because cortisol is at its peak when you wake up, and this hormone naturally makes you awake and alert. But there are still many people like to make a cup of coffee in the morning to spend a quiet time, let the head slowly wake up in the strong aroma of coffee.

From a psychological point of view, when people focus on taste, aroma and temperature, it is an exercise of mindfulness, which helps to relax and boost your mood, allowing you to start the day with a more positive attitude.

Before lunchtime (10-11:00): enhance your learning ability

Cortisol levels continue to drop after morning until lunchtime. At this time of day, the greatest benefit of caffeine intake is to strengthen memory and learning ability.

In an experiment conducted at Johns Hopkins University in the United States, two groups of subjects were asked to remember a series of images and one group was given a pill containing 200 milligrams of caffeine. The researchers then tested their ability to recognize images, and all the subjects who took caffeine pills performed better. If you need to read a report, attend a seminar or learn something new before lunch, a cup of coffee will benefit you a lot.

Between 1: 00 pm and 3: 00 pm: stay awake and relieve eye fatigue

Cortisol levels reach their second peak at lunchtime and begin to drop again after 1pm, coupled with a rise in blood sugar that makes your head dizzy, so a cup of coffee after lunch may keep you awake.

When a chemical in the brain called adenosine binds to its receptor, it makes people feel sleepy. And caffeine can prevent this condition to ward off drowsiness. It usually takes at least 8 hours to metabolize all caffeine, and if you don't want to interfere with your sleep at night, the best time to drink coffee is between 1 and 3 p.m. It is worth noting that many office workers stare at the computer screen in the morning and feel dry, tired and bloodshot in the afternoon. Many people choose eye drops, but clinician Jeannette Graf points out that caffeine, like the "tannins" found in tea, has soothing and anti-inflammatory effects and can reduce eye fatigue and edema; and caffeine helps the microcirculation of blood in the skin, temporarily reducing eye bags by reducing blood vessels and calming the skin. If you happen to be going to a party after work and don't want to see people with deep bags under your eyes and red and swollen eyes, try a cup of coffee.