You should pay attention to different times when drinking coffee.

Coffee contains caffeine, after entering the body will promote sympathetic excitation, thus eliminating drowsiness, improve blood circulation, the body also feels warm, do not feel tired, so there is a "refreshing" effect. However, sympathetic nerve stimulation, excitation, but there is a negative effect on appetite, that is, appetite will be reduced, so drink coffee before meals will not want to eat. In addition, because the stomach is stimulated and gastric juice secretion increases, stimulating the empty stomach is not good for gastric ulcer patients. This can be said to be a negative effect of coffee. However, drinking after meals, because gastric secretion will increase, so it is helpful for digestion. So there's absolutely no problem drinking it after a meal.

In addition, some people think that adding milk to drink can alleviate its stimulating effect, but how much of a small amount of milk can neutralize caffeine, unless it is half milk and half coffee, mixed into coffee milk or milk coffee, may have some effect. For example, coffee milk drunk at breakfast, because milk is more than coffee, although empty stomach drinking, still have the effect of easing gastric juice. Ideally, drink it after you eat it, it's good and harmless.

Asthma or allergic rhinitis is caused by the excitation of parasympathetic nerves in the allergic system. If it can stimulate sympathetic nerves and inhibit parasympathetic nerves, it will help prevent attacks. Especially severe allergy patients, some minor incentives can cause physical discomfort, coupled with psychological fear of allergies, often out of control.

Therefore, it is recommended to take advantage of the advantages of caffeine, in allergies, asthma is about to attack (the patient himself feels) drink a cup of coffee in advance, quite preventive effect. In addition to the stimulant effect of caffeine, patients have a psychological sense of security that they have "already drunk coffee" and are less likely to attack. Of course, the so-called "too much is not enough", no matter how good things, but also "enough".

Otherwise, regardless of drinking before and after meals, excessive caffeine will cause palpitations (heart beats very badly), and even side effects such as trance and unstable walking center of gravity. Watch out! Excessive drinking caffeine drinks prone to kidney stones In principle, coffee to two to three cups a day is appropriate, such as drinking four or five cups, most people will feel nausea, so be careful.