Caffeine, also called caffeine. Besides coffee, there are many caffeinated drinks. One is that there is natural caffeine in the drinks, such as cocoa and tea, and the other is that caffeine is added to the drinks, such as some soda water and fruit juice. Coffee is not a drug, while caffeine is a state-controlled psychotropic drug.

Many people rely on coffee and strong tea to refresh themselves when they are tired. Over time, they have formed "coffee dependence", which is very harmful. Excessive intake of caffeine for a long time may unconsciously lead to chronic caffeine poisoning, and the symptoms include mental stress, anxiety, hand shaking, muscle tension, insomnia, palpitation and so on. I can't even concentrate.

Adults should not consume more than 300 milligrams of caffeine a day, which is about two cups of coffee. Patients with diabetes and heart disease should stay away from caffeinated drinks, and pregnant women, postmenopausal women and patients with peptic ulcer should not consume too much caffeine.