The chemical composition of coffee is very complex, there are thousands of at most, even nearly 200 unknown chemicals, but given that coffee as the world's third largest trade, Western countries and Arab countries have hundreds of years of drinking history has not seen its mortality rate higher than the Chinese, it can be seen that coffee as a drink or safe.
Coffee is most notorious than caffeine, although caffeine is common in tea, cola and other daily drinks, and even some tea drinks have higher caffeine content than coffee, but because this substance is called "caffeine", so we think of coffee.
The caffeine content in coffee varies greatly according to the variety, generally Arabica caffeine content in 1.1%~1.5%, Rochester caffeine content is as high as 2.5~4%. In addition, the water solubility of caffeine is also affected by the extraction temperature and time, generally a cup of American coffee caffeine in about 150mg, handmade coffee (siphon pot, etc.) about 120mg, Italian coffee is about 80mg.
The caffeine intake of the human body is safe within 300mg a day, of course, depending on height and weight, but generally 3 cups of high-quality coffee a day is no problem.
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