Overturn these coffee rumors and enjoy the most romantic health drink.

Some people mention "caffeine" as if facing the enemy, always feel that this drink like chicken blood is bad for the body, sleep disorder, nausea, heart pounding …... There are also terrible keywords "addiction" and "high calorie"! You won't know until you see whether coffee is a romantic pleasure or a sinful drink.

First of all, coffee referred to below refers to pure coffee, that is, coffee without milk, syrup or any other substance. Pure coffee is actually very low in calories and contains a variety of nutrients, so drinking it in moderation is good for your health. Those "high-calorie" coffee are fancy coffee with all kinds of syrup, milk and cream, or three-in-one instant coffee, a cup full of guilt.

Pure coffee has many health benefits.

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, the most common form of liver cancer, by 40%. Other studies have said that drinking coffee regularly can reduce the risk of ovarian cancer in women.

2Enhancement of memory.

Dr. Jacqueline 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 and helps prevent cognitive decline.

3Protective function of 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. People who drink one cup of coffee a day have a lower risk of death from stroke than those who don't drink coffee, according to a study by the National Cancer Research Center of Japan.

4Prevention of diabetes.

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 contributes 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. Fu Changming also said that Chengmai County, the hometown of longevity in Hainan, is rich in coffee, and the average life expectancy is 77.79 years, 6.59 years longer than the national average. All the long-lived people here have the habit of drinking pure coffee.

In addition, Dr. Frank Hu, a professor of nutrition and epidemiology at the Harvard School of Public Health in the United States, also found in the study of coffee that drinking coffee can reduce the risk of fatty liver and reduce the risk of suicide by 50%. At the same time, it also promotes digestion and prevents constipation.

Why is the coffee so controversial?

Many people think that drinking coffee is a kind of evil "enjoyment", one of the reasons is 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 and other uncomfortable symptoms, but also may cause poisoning.

But the premise that caffeine can cause harm to the human body is an "overdose". Coffee contains more than 200 substances, in addition to caffeine, there are protein, fat, nicotinic acid, tannic acid, alkaloids, potassium, dietary fiber and other nutrients. Therefore, it would be wrong to equate coffee with caffeine.

Caffeine content is also closely related to the variety of coffee beans. At present, there are two major coffee tree species in the world, Arabica and Robsta coffee beans. The former is of the best quality and the most widely planted, with a caffeine content of about 1% to 1.7%, nearly double that of the latter. Most of the instant coffee sold on the market uses robusta beans.

The focus of the coffee controversy is "addiction".

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.

Coffee is accused of being "high in calories".

This is actually a mess of instant coffee. Strictly speaking, instant coffee is basically not coffee. Its coffee content is low and there are many additives. There are only 2 grams of coffee powder in 17 grams of instant coffee. The worst coffee beans are used to make instant coffee, and the cost is so low that even people in the industry seldom drink it.

If you look carefully at the composition table of instant coffee, you will find that some common ingredients are plant fat, fat and carbohydrates, while plant fat powder contains trans fatty acids, which is bad for your health.

Some people think that coffee is the culprit of bone loss.

However, 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.

But among the many troubles caused by coffee, it should be noted that coffee can cause sleep disorders. The study found that the stimulating effect of caffeine can last for six hours, and drinking in the afternoon can also affect the quality of sleep at night.

Enjoy healthy coffee time

The health benefits of coffee can play a greater role only if you drink it correctly. If you love coffee, you might as well try to do the following in order to enjoy coffee healthily.

No more than 3 cups a day.

People's tolerance for coffee varies from person to person. 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).

(3) special people should pay attention to it.

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.

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.

It should be reminded that it is best not to drink coffee on an empty stomach or after dinner, so as not to affect the quality of sleep.