Are there any side effects of drinking black coffee for a long time? the advantages, disadvantages and efficacy of hand-made black coffee

What's the effect of drinking black coffee for a long time? Who is not fit to drink coffee? Editors have been drinking coffee for almost ten years, basically one cup of coffee a day, and even three or four cups every day. Today, let's talk about the effects of caffeine. Caffeine has many effects on the human body, such as the well-known refreshing mind. Usually before work, the editor will have a cup of coffee to improve work efficiency. Many student parties also like to have a cup of coffee to refresh themselves and improve their work efficiency before studying. In addition to these thoughts, coffee also has the function of improving metabolism, which can be used when we are exercising and can improve our exercise ability. There is another feature of black coffee that many people do not know, that is, it can lose face, usually eat too much salty things at night, and when the face is swollen the next day, you can drink some black coffee to reduce the swelling. This is also one of the reasons why stars like to drink black coffee. So what's wrong with black coffee? It's okay to use a normal amount of coffee, but if you drink too much, you will have heart palpitations, so pay attention to the amount you drink, and don't drink more than three cups a day. If you suffer from heart disease and high blood pressure, you can't drink too much and drink less coffee as much as possible. In fact, there are many kinds of black coffee. Black coffee refers to pure coffee, without adding milk or sugar, hand-brewed coffee, American coffee, mocha pot coffee, espresso, etc. No matter how it is made, as long as it is pure coffee is black coffee.