Drinking healthier coffee after a meal contains caffeine.

Coffee, as a representative of fashion and delicacy, has been favored by countless people. However, drinking coffee without paying attention to time will cause harm to people's body.

Coffee contains caffeine, which excites the sympathetic nerves after entering the body, thus eliminating drowsiness, improving blood circulation, and the body also feels warm and does not feel tired, so it has 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. This can be said to be the negative effect of coffee. But drinking after a meal is helpful to digestion because the secretion of gastric juice will increase.

Another advantage of drinking coffee after dinner is to prevent the onset of allergies. Asthma or allergic rhinitis is caused by the excitation of the parasympathetic nerve in the allergic system. If it can excite the sympathetic nerve and inhibit the parasympathetic nerve, it will help to prevent the attack of allergy.

Of course, no matter how good things are, "enough is enough", otherwise, regardless of drinking before and after meals, excessive caffeine will have side effects such as palpitations, even trance, unstable walking center and so on.