Coffee is healthy
Some people think that coffee contains more caffeine and is too irritating, so we should drink black tea instead. In fact, does coffee really have such a strong effect on the human 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 less 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, the appetite will be reduced, so drinking coffee before a meal will not want to eat; in addition, because the stomach is stimulated and gastric juice secretion increases, stimulating the empty stomach, it 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.
Therefore, there is absolutely no problem with drinking after a meal. In addition, some people think that adding some milk to drink can ease its irritating effect, but I doubt how much of a small amount of milk can neutralize caffeine, unless half milk and half coffee, mixed with coffee milk or milk coffee, may have some effect. For example, coffee and milk for breakfast, because there is more milk than coffee, although it is drunk on an empty stomach, it still has the effect of relieving gastric juice. Ideally, drink after a meal, which is beneficial but harmless. One of the benefits is to prevent the onset of allergies. As a result of allergic parasympathetic nerve excitation caused by asthma or allergic rhinitis, if it can promote sympathetic nerve excitement, inhibit parasympathetic nerve, it will help to prevent the attack. Especially serious allergic patients, some mild incentives can cause physical discomfort, coupled with psychological fear of allergies, often out of control. Therefore, it is recommended to make use of the advantages of caffeine to drink a cup of coffee in advance when allergies and asthma are about to occur (the patient feels it), which is quite preventive. In addition to the excitatory effects of caffeine, patients who have "already had coffee" on sense of security are less likely to attack.
Of course, the so-called "go too far", no matter how good things are, we should be vigilant that "enough is enough". Otherwise, regardless of drinking before and after meals, excessive caffeine will lead to hyperpalpitation (the heart beats violently), and even side effects such as trance, unstable walking center and so on.
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. In principle, no more than three cups a day is best for any kind of irritating drink.
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Staying up late for coffee is more likely to get tired.
Many people who often stay up late will choose to drink coffee to refresh themselves, but experts warn that staying up late is an overdraft of their health, and drinking stimulating drinks such as coffee and strong tea is not good for health. The refreshing effect of coffee varies from person to person, and it is also temporary. Drinking a lot of coffee can speed up metabolism, consume B vitamins related to nerve and muscle coordination, and lack of sustenance.
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Caffeine is safe as a food additive.
As a food additive, caffeine has been widely used in food, including coffee, cola, tea and chocolate. Different foods have different levels of caffeine, such as 400ppm (caffeine content per kilogram of product, in milligrams) and tea (200-400ppm, depending on the method and time of making tea).
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