Coffee beans contain about 100 different substances, including caffeine, tannic acid, oil and nitrogen compounds. Every100g of instant coffee contains 44 ~100g of caffeine; Every 100g of brewed coffee contains 64 ~ 124mg of caffeine.
Coffee is a stimulant, which has many effects on human body, such as diuresis, stimulating the central nervous system and respiratory system, dilating blood vessels, speeding up the heartbeat, enhancing the strength of striated muscles, and relieving brain and muscle fatigue.
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Drinking taboo
1, remember that coffee is not suitable for drinking with tea. Tannic acid in tea and coffee can reduce iron absorption by 75%;
2. Tannic acid in tea and coffee will reduce the absorption of calcium. Therefore, it is best to choose the time for drinking tea and coffee between meals;
3. Caffeine-containing drinks and foods can cause nausea, vomiting, headache, and rapid heartbeat after being drunk in large quantities by pregnant women. Caffeine can also enter the fetus through the placenta, affecting fetal development.
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Baidu Encyclopedia-Coffee (one of the three largest drinks in the world)