The composition of caffeine and its effect on the body are introduced. It has a particularly strong bitter taste and stimulates the central nervous system, heart and respiratory system. Appropriate amount of caffeine can also reduce muscle fatigue and promote digestive juice secretion. Because it promotes kidney function, it is diuretic and helps the body to expel excess sodium ions from the body. But eating too much can lead to caffeine poisoning.
Tannic acid
Boiled tannic acid will decompose into pyrouric acid, so coffee that has been brewed for too long will taste worse.
Fat
The most important of these are acidic fat and volatile fat.
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