There are advantages and disadvantages of drinking coffee.

■ fact 1: coffee is good for your health

Doctors say that coffee has both advantages and disadvantages, so moderate consumption of coffee is the key to benefit from it. Studies conducted by American biologists have shown that drinking two to three cups of coffee a day is more than enough to protect the heart, and if you are overweight, they can also increase metabolism and even reduce your appetite. Coffee contains the same amount of antioxidants as green tea, which means that in theory, coffee can prevent cancer and slow aging.

■ fact 2: coffee will kill you

Some experts believe that coffee should not be drunk on the grounds that coffee can raise blood pressure and cause blood vessel walls to contract, so excessive consumption of coffee may cause heart disease.

There is some truth in this argument. However, American experts believe that the lethal dose of caffeine is 10 to 13 grams, which means you must drink 23 liters of coffee at a time to be fatal, which is equivalent to more than 100 cups of coffee. However, drinking so much liquid at one time, even if there is no caffeine, you will not be able to save your life.

■ fact 3: coffee is a good friend for fitness.

Two cups of coffee a day can help relieve muscle soreness after strenuous exercise, according to scientists at the University of Georgia. You don't have to drink coffee regularly, as long as you drink two cups after exercise, you can restore your muscles.

Another advantage of coffee is that it increases your physical strength, which helps you exercise longer and make it work better. Caffeine is an essential part of team sports because it enhances attention and response. Drinking too much coffee, coupled with intense exercise, may lead to tachycardia and excitement, causing insomnia, neurological disorders and other symptoms.

■ fact 4: coffee is better than wine

Red wine and champagne are considered essential traditional drinks for romantic dinners. Now, however, men need to re-recognize this traditional habit. Researchers at the University of South Wales suggest that if you want to interact passionately with a woman after dinner, ask your woman to drink some coffee.

They conducted a series of experiments with female mice and found that a certain dose of caffeine made the mice have more frequent sexual contact. However, maybe this drink only works for women who don't drink coffee very often. If she drinks coffee a lot, you'll have to rely on wine and your charisma to ignite her passion.

There is a theory that a certain dose of caffeine will make men in bed more active. Caffeine increases the speed of blood flow, which means more blood is sent to the sexual organs, which may prolong erections and sex. Therefore, coffee can be used as a substance to prevent erectile dysfunction.

■ fact 5: coffee doesn't have much more caffeine than green tea.

There are many theories about coffee, including praise and criticism. The claim that coffee is good for erections and can cause insomnia is entirely true. Its main effect on the body is to stimulate the nervous system.

A cup of instant coffee usually contains as much caffeine (or a little more) as a cup of strong black tea. Green tea may contain more caffeine. However, people will carefully control the amount of coffee they drink from the afternoon, but there is no limit on the amount of tea they drink, because drinking tea will make them consume more caffeine.

The doctor advised people not to drink coffee for six hours before going to bed. The same should be true for drinking tea. The caffeine in tea has a calmer and longer-lasting effect.

■ fact 6: decaffeinated coffee contains caffeine

If your coffee can says "decaffeinated coffee", don't think you're drinking colored water. Decaffeinated coffee is not decaffeinated, but it contains less caffeine, five times less caffeine than regular instant coffee and three times lower than cola.

■ fact 7: decaffeinated coffee contains chemicals

The decaffeinated process involves scalding raw coffee beans with hot water, making caffeine particles "float" to the surface, then processing coffee beans with organic solvent dichloromethyl, roasting and treating them. Scientists hope that the coffee processing method, which is adopted around the world, will produce a product that is harmless to the human body.

■ fact 8: roasting and brewing methods determine the taste of coffee

The essential oil contained in coffee beans evaporates at a temperature of 200 degrees Celsius. The more essential oils extracted during baking, the more bitter the coffee will taste and the stronger the coffee flavor will be. According to the color of coffee beans, we can tell how they are baked. The color of raw coffee beans is white or even a little blue. by baking, the color becomes darker, brown to black. The duration of brewing also affects the taste and composition of coffee. If you want to extract all the caffeine, soak it for as long as possible, and choose a darker way of baking.

■ fact 9: caffeine is not bitter

The bitterness of coffee is not caused by caffeine. Chemists believe that coffee contains healthy antioxidants that make it bitter. If you want to be young and healthy, try to put up with the bitterness of coffee.

■ fact 10: goat discovers coffee

According to legend, coffee was first discovered and processed in Africa around 800 AD. Kadi, an Ethiopian shepherd, was very confused. I don't know why his goat suddenly became so bright that he couldn't sleep at night, so he decided to find out. As a result, he found that the goat became full of energy after eating a kind of red berry on the tree. He brought the berries to a local priest, and the monks processed the first batch of coffee, and after drinking it, they could chant the sutras all night without falling asleep.