Never drink coffee on an empty stomach.

Coffee is a familiar drink for white-collar workers who travel around the major office buildings. The coffee shop is the preferred place for daily business meetings, and coffee is also a pick-me-up for staying up late.

Coffee contains caffeine, after entering the body will promote sympathetic excitement, thus eliminating drowsiness, improve blood circulation, the body also feels warm, do not feel tired, so there is a "refreshing" effect.

However, when the sympathetic nerve is stimulated and excited, it has a negative effect on appetite, that is, appetite will be reduced, so drinking coffee before a meal will not want to eat. In addition, due to the stimulation of the stomach and the increase of gastric juice secretion, stimulating the empty stomach is disadvantageous to patients such as gastric ulcers. But drinking after a meal is helpful to digestion because the secretion of gastric juice will increase. Therefore, there is absolutely no problem with drinking after a meal.

Of course, as the saying goes, "going too far is not as good as it is". No matter how good it is, we have to "enough is enough". In principle, it is appropriate to drink two to three cups of coffee a day. If you drink four or five cups, most people will feel sick, so be careful.