Coffee beans contain about 100 different substances, including caffeine, tannic acid, oil and nitrogen compounds, etc. Every 100 gram of instant coffee contains 44~ 100 mg of caffeine; Every100g of brewed coffee contains 64 ~124mg of caffeine.

Coffee is a stimulant, which 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.

The disadvantages of coffee

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.

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, and caffeine will affect sleep within 4 hours after drinking coffee.

Drinking taboos:

Remember that coffee should not be drunk with tea at the same time. Tannic acid in tea and coffee can reduce iron absorption by 75%;

Tannic acid in tea and coffee will reduce calcium absorption. Therefore, the time for drinking tea and coffee is best to choose between two meals;

Caffeine-containing drinks and foods will cause nausea, vomiting, headache and rapid heartbeat after being drunk in large quantities by pregnant women. Caffeine will also enter the fetus through the placenta, affecting fetal development;

Many doctors believe that drinking 1~2 cups of coffee, tea or carbonated drinks every day will not affect the fetus. But for the sake of caution, it is best for pregnant women to ban it. Caffeine can lead to an increase in abortion rate, so you should drink decaffeinated drinks;

Children should not drink coffee. Caffeine can excite children's central nervous system, interfere with children's memory and cause ADHD.

Extended data

Coffee is one of the three major drinks in the world, which is made from roasted coffee beans. It is the main drink popular in the world together with cocoa and tea.

The main raw material of coffee is coffee beans, which contain caffeine, tannic acid, fat, protein, sugar and minerals.

Caffeine is the most striking of all the ingredients in coffee. It can accelerate the metabolism of human body and keep people clear-headed and alert. The "refreshing" effect of coffee is particularly popular.

The fat contained in coffee plays an extremely important role in flavor. After analysis, it is found that there are many kinds of fat contained in coffee, among which the most important ones are acidic fat and volatile fat. Acidic fat means that the acidity in fat varies with the type of coffee, and volatile fat is the main source of coffee aroma.

Baidu encyclopedia-coffee

Baidu encyclopedia-coffee beans