A cup of coffee has five advantages, and big-name doctors can't help drinking a few cups.

When the first coffee bean was picked, roasted, ground and brewed into mellow and elegant hot coffee, the invention, known as the most romantic, began to spread around the world.

According to the statistics of the International Coffee Organization, the world consumes 400 billion cups of coffee every year, and 14000 cups are drunk every second.

On the other hand, Chinese people are not enthusiastic about it all the time, drinking only about 5 cups per person per year, and many people face the enemy at the mention of "caffeine".

We synthesize a number of studies at home and abroad and interview relevant experts to take you to find the health magic of a cup of coffee.

Experts interviewed:

Fu Changming, Secretary-General of Hainan Coffee Association

Ma Guansheng, Professor, Department of Nutrition and Food Hygiene, School of Public Health, Peking University

The famous doctor is coffee vindication.

Charge one: caffeine is harmful to health

Many people think that coffee contains a lot of caffeine, drinking too much can easily lead to increased heart rate, sleep disorders, nausea and vomiting, elevated blood pressure, etc., but also may cause poisoning.

Experts explain that the premise that caffeine is harmful to the human body is "overdose". Coffee contains more than 200 substances, in addition to caffeine, there are a variety of nutrients, the equal sign of coffee and caffeine, coffee is wronged.

Charge number two: drinking coffee is addictive.

British research has found that caffeine is an irritant to the central nervous system. Drinking coffee regularly may lead to mild dependence. If you don't drink it suddenly, you will have headaches, fatigue, anxiety and lack of concentration.

But these symptoms disappear after a few days and are not as dangerous as other drugs and do no harm to physical and mental health.

Charge 3: high calorie

In fact, this is a mess of instant coffee, instant coffee is basically not coffee, its coffee content is low, there are many additives. Many instant coffees add plant fat, fat and carbohydrates, while plant fat powder contains trans fatty acids, which is bad for health.

Charge 4: causing osteoporosis

Professor Hu Dayi, a famous cardiovascular expert in China, co-authored a book "101 reasons for Coffee innocence" with former World Heart Federation President Mario Marao and other experts.

The human body contains about 1100 grams of calcium, 99% of which is deposited in bones and teeth, so the amount of bone calcium is not reduced by drinking coffee as a diuretic.

Five benefits of plain coffee

Experts often say that coffee refers to pure coffee, that is, coffee without adding any other substances. It is very low in calories and contains a variety of nutrients, so drinking in moderation is good for your health.

1. Reduce the risk of cancer

A study published in the American Journal of Clinical Gastroenterology and Hepatology found that drinking coffee every day reduced the risk of primary liver cancer by 40%. Other studies have said that drinking coffee regularly can reduce the risk of ovarian cancer in women.

two。 Enhance memory

Dr. Jack Lin London, senior dietitian at Mount Sinai Hospital in New York, USA, said that moderate consumption of caffeine is good for both short-term and long-term memory, helping to prevent cognitive decline.

3. Protect cardiovascular system

South Korean researchers studied 25000 subjects and found that people who drank 3 to 5 cups of coffee a day had a lower risk of cardiovascular disease.

4. Prevention of diabetes mellitus

A study of 126000 people by Harvard University in the United States shows that coffee drinkers have a lower risk of developing type 2 diabetes.

5. Contribute to longevity

An academic paper published by a professor of pediatrics at Indiana Medical University in the United States shows that people who insist on drinking coffee have a lower mortality rate than ordinary people.

Chengmai County, the hometown of longevity in Hainan, is rich in coffee, with an average life expectancy of 77.79 years, 6.59 years longer than the national average.

This is the healthiest way to drink coffee.

Coffee has many benefits, but it can only be effective if you drink it right.

Choose plain coffee

If you make it at home, you can buy coffee beans for fresh grinding, or buy coffee powder directly and brew it in hot water.

1g coffee powder to 15ml or 18ml water is the best brewing ratio, people who are not used to drinking pure coffee can put less coffee, put more water, gradually adapt.

If it is difficult to adapt, add less sugar or fresh milk, but do not add cream.

If you drink coffee in a cafe, you'd better choose American coffee without cream and sugar.

Don't exceed 3 cups a day.

After studying caffeine in the Dietary guidelines for American residents, healthy people drink 3 to 5 cups of coffee a day as part of a healthy diet. Many domestic experts suggest that it is best not to exceed 3 cups a day (about 200 milliliters per cup).

The morning is the best time.

Neuroscientists in the United States have calculated that the best time to drink coffee every day is at 9: 30 in the morning. This is because caffeine interacts with cortisol, an important hormone in the body, to reach its optimal state during this period of time.

Need to be reminded, it is best not to drink coffee on an empty stomach, nor after dinner, so as not to affect the quality of sleep.

Drinking taboos for special people

According to a number of British and American studies, pregnant women should reduce their coffee intake by no more than 2 cups a day, while people with high blood pressure should pay attention to the time they drink coffee and try not to get up early in the morning to avoid a rapid rise in blood pressure.