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 and has many effects on human body. It can induce diuresis, stimulate the central nervous system and respiratory system, dilate blood vessels, accelerate the heartbeat, enhance the strength of striated muscles and relieve brain and muscle fatigue.
Disadvantages of coffee
1. People who are used to drinking a lot of coffee will stop drinking coffee, and they will have symptoms such as headache, irritability, muscle tension and nervousness, and the symptoms will disappear after taking caffeine.
2. Women during pregnancy and lactation should drink coffee in moderation, because caffeine will penetrate into the placenta and appear in breast milk.
Drinking coffee will arouse people's mental excitement. Caffeine can affect sleep within 4 hours after drinking coffee.
Extended data
Coffee type
1, latte
Latte coffee is a classic mixture of espresso and milk, and Italians also like lattes as breakfast drinks. In the Italian kitchen in the morning, coffee and milk are usually cooked at the same time on a sunny stove.
2. American coffee
"American coffee" (English: Americano, Italian: Caffè Americano) is a kind of coffee and the most common coffee. It is made of black coffee, which is made of drip coffee pot or concentrated in Italy by adding a lot of water.
American coffee tastes mild. Because the general extraction time is relatively long (about four or five minutes), the caffeine content is high.
3. Mocha
Mocha Cafe is the oldest coffee, and its history can be traced back to the origin of coffee. It is a mixture of espresso, chocolate sauce, whipped cream and milk. Mocha is named after the famous Mocha Port.
/kloc-in the 0/5th century, the external traffic of non-coffee countries in the Middle East was not prosperous. Mocha in Yemen was the main export port near the Red Sea at that time. At that time, coffee was mainly African coffee concentrated in Mocha Port and then exported, collectively known as Mocha coffee.
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