Supplement:

It belongs to a kind of phytoxanthin (animal muscle component), and its properties are the same as theobromine contained in cocoa and theophylline contained in green tea. After baking, the percentage of reduction is very small. Caffeine has a wide range of effects, which will affect the brain, heart, blood vessels, gastrointestinal tract, muscles, kidneys and so on. Proper caffeine can stimulate cerebral cortex, promote sensory judgment, memory and emotional activities, make myocardial function more active, dilate blood vessels and enhance blood circulation. In addition, because it can also promote kidney function and help the body excrete excess sodium ions (chemical components that hinder the metabolism of water molecules), caffeine will not accumulate in the body like other narcotic and excitatory substances (narcotic drugs, paint solvents, stimulants, etc.). ) With the improvement of diuresis, it will be excreted in about two hours. The biggest specialty of coffee flavor-bitterness is caused by caffeine. Tannic acid: Tannic acid will turn into light yellow powder after refining, which is easily soluble in water. After boiling, it will decompose to produce phthalic acid, which will make the taste of coffee worse. If you leave it for several hours after brewing, the color of coffee will become stronger than when it was just brewed, and it will not be so tasteless, so there is a saying that "it is best to drink it as soon as possible after brewing".