After drinking coffee, caffeine will be absorbed into the blood stream and transmitted to the brain, blocking an inhibitory neurotransmitter called adenosine and causing excitement. This can improve many functions of the brain, including memory, emotion, reaction time and cognitive function.

Drinking coffee often can protect you from the sun.

Why can coffee bring these effects to the skin? The authors believe that the special ingredients of coffee (including caffeine) may resist the occurrence of cancer: in animal experiments, they found that coffee can inhibit cells from becoming carcinogens after exposure to sunlight, reduce oxidation and DNA damage, absorb harmful light (similar to sunscreen milk), and detoxify carcinogens.

Help burn fat and improve activity.

Many studies have confirmed that caffeine can increase the metabolic rate by 3%, reaching 1 1%. Overweight people drinking coffee can increase fat burning 10%, while thinner people can reach 29%. Coffee can increase adrenaline and stimulate adipose tissue to release fatty acids, which work for the body like fuel. Generally speaking, caffeine can increase the activity of 1 1% to 12%. It makes sense to drink a cup of espresso half an hour before fitness. Has the function of protecting the liver.

The liver is an important organ of the human body. Common diseases of the liver include hepatitis and fatty liver, many of which will lead to cirrhosis. Studies have shown that caffeine can prevent sclerosis, and people who drink more than four cups of coffee a day can reduce their risk by as much as 80%.

Rich in essential nutrients.

Although some nutrients in coffee beans are lost after being brewed into coffee, coffee is still rich in nutrients such as riboflavin, calcium pantothenate, manganese, potassium, magnesium and vitamin B3. It seems that the content is not high, but if you drink three or four cups a day, you can accumulate a considerable amount. However, you should drink according to your physical condition to avoid palpitations caused by excessive coffee.

Fighting depression makes you happier.

A Harvard study published on 20 1 1 pointed out that the depression rate of women who drink more than four cups of coffee every day is reduced by 20%, and another study found that the suicidal tendency is reduced by 53%.

First of all, many people in China regard coffee as a functional drink and tea as a daily drink because of caffeine. Of course, this is understandable, but in fact, the content of methyl purine in a cup of strong tea is absolutely no less than that in a cup of coffee. Although the caffeine content of strong tea is about 20% less than that of coffee, tea contains theophylline (dioxydimethylpurine), which is a similar substance of caffeine, and its effects are similar to those of coffee, including excitement and side effects. (Thanks to viga wang for his correction)

Second, many westerners like to drink tea, but there is still a huge market for coffee, which shows that coffee and tea can't replace each other.

Third, in terms of taste, coffee and tea taste different. Coffee can show different flavors according to bean varieties (varieties and local conditions) and baking degree (see flavor wheel). Tea also has aroma types, but the aroma types are not very similar. You can taste fruit in coffee, but it is difficult in tea, and so is the taste of tea.

Fourthly, it must be said that drinking a cup of espresso after extraction takes much less time than drinking another cup of espresso after brewing, which is more suitable for fast-paced life.