As a representative of fashion and delicacy, coffee has been favored by countless beautiful women. However, if you don't pay attention to the time, drinking coffee will do harm to the health of coffee beauties.

One: Coffee contains caffeine, which will excite sympathetic nerves after entering the body, thus eliminating drowsiness, improving blood circulation and making the body feel warm without fatigue, so it has a "refreshing" effect. But the stimulation and excitement of sympathetic nerve has a negative effect on appetite, that is, appetite will decrease, so drinking coffee before meals will make you unwilling to eat. In addition, because the stomach is stimulated, the secretion of gastric juice increases, which stimulates fasting, which is not good for patients with gastric ulcer. This can be said to be the negative effect of coffee. But drinking after meals will help digestion, because the secretion of gastric juice will increase. So it's absolutely no problem to drink after meals.

Two: Some people think that adding some milk to drink can alleviate its stimulating effect, but a small amount of milk can neutralize caffeine to some extent. Unless it is half milk and half coffee, making coffee milk or milk coffee may have some effect. For example, drinking coffee and milk for breakfast, because milk is more than coffee, although it is drunk on an empty stomach, it still has the effect of relieving gastric juice. The ideal thing is to drink it after meals, which is beneficial and harmless. One of the benefits is to prevent allergic attacks. Asthma or allergic rhinitis is caused by parasympathetic nerve excitation of allergic system. If we can stimulate the sympathetic nerve and inhibit the parasympathetic nerve, it will help to prevent the attack. Especially for patients with severe allergies, some slight incentives can cause physical discomfort, coupled with psychological fear of allergies, often out of control. Therefore, it is suggested to use caffeine to have a cup of coffee in advance (the patient can feel it himself) when allergies and asthma are about to attack, which is quite preventive. In addition to the exciting effect of caffeine, patients also have a sense of security after drinking coffee, and the possibility of seizures is small.

Of course, the so-called "too much is too late", no matter how good things are, we must "enough is enough." Otherwise, whether drinking before or after meals, excessive caffeine will cause palpitations (heart beating badly), and even side effects such as trance and unstable walking center of gravity. In principle, two or three cups of coffee a day are appropriate. Most people will feel sick if they drink four or five cups, so be careful. In principle, no matter what kind of stimulating drinks, it is better not to exceed three cups a day.