Coffee, as a representative of fashion and good taste, has been welcomed by a lot of beautiful women. However, if they do not pay attention to some notices when drinking coffee, it will cause some harms on their body. Coffee contains some caffeine. When the caffeine comes into the body, it will lead to the excitement of the sympathetic nerve, thus eliminating the drowsiness, improving blood circulation, and warming up the body. This can make people not feel tired, so it has a "refreshing" effect on human body.

However, when the sympathetic nerve is stimulated and excited, it will bring negative effects on the appetite, which will reduce the appetite. As a result, if you drink coffee before eating the meal, you will not feel like eating other food any more. In addition, as the caffeine will stimulate the stomach and increase the secretion of gastric juice, it is very harmful to the patients who suffer from gastric ulcer. This can be said as the negative effects of coffee. But if you drink coffee after you have eaten meal, because the secretion of gastric juice is increasing, so it can help promote the digestion.

As a result, the ideal way is to drink coffee after eating meal, which will bring no harms on the body. One of the benefits is to prevent the attack of allergic rhinitis and asthma, which are caused by the excitement of parasympathetic nerve. As a result, if we can promote the excitement of sympathetic nerve while inhibit the excitement of parasympathetic nerve, we can help prevent the attack of these diseases. Especially for the patients who suffer from severe allergies, some minor incentives can cause serious discomforts and great harms on the body.

As a result, we can make use of the advantages of caffeine, drink a cup of coffee in advance when the allergic rhinitis or asthma is going to attack. This plays a good preventive role. In addition to the exciting effect of caffeine, it can also give the patients a sense of safety psychologically, which can also reduce the attack of these diseases.

Of course, no matter you drink coffee before or after the meal, you should not drink too much each time. Otherwise, the excessive coffee may bring a lot of harms on the body, leading to palpitation, absent-mindedness, and other side effects. In principle, drinking two to three cups of coffee every day is appropriate.