Coffee can refresh the brain and improve the quality of work. It is recommended to drink coffee after lunch and in the afternoon, which can have a better effect on the cerebral cortex. Drinking coffee after lunch and in the afternoon is more appropriate, because coffee contains a lot of caffeine, can refresh the brain, it is easy to feel sleepy after lunch, drinking coffee can make the human body invigorated, make more energy, can have enough energy to work. The afternoon is also a more easily fatigued period of the day, it is easy to get sleepy, drinking coffee at this time, can also be invigorating, have better work efficiency. In addition, do not drink a lot of coffee in a short period of time in order to refresh, so as not to increase the load on the heart, and not to drink coffee on an empty stomach, so as not to increase the stimulation of the stomach and intestines, especially patients with gastrointestinal diseases.