Drinking coffee can improve memory and prevent cancer. Hot coffee is the cause of cancer.

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Research from Johns Hopkins University (Johns Hopkins University) has found that drinking one or two cups of coffee a day can not only help people wake up, but also help improve memory. The World Health Organization (WHO) research team pointed out that drinking coffee regularly does not cause cancer and may even prevent at least two types of cancer.

This new conclusion not only overturns the previous belief that coffee may cause cancer, but also points out that the real cause of cancer may be the habit of drinking overheated drinks.

WHO's International Agency for Research on Cancer (IARC) gathered 23 scientists from various countries and reviewed more than 1000 studies. In a report published in the Lancet Oncology, the evidence suggests that coffee is less likely to cause cancers such as breast, prostate and pancreatic cancer.

Dana Loomis, deputy leader of the agency's carcinogen classification project and lead author of the study, says there is insufficient evidence that coffee may cause cancer.

In addition, drinking coffee may also reduce the incidence of liver and uterine cancer. In the latest report, the team pointed out that each cup of coffee drunk every day can reduce the risk of liver cancer by 15%.

The reason why coffee may help prevent cancer is unclear, but coffee has shown a strong antioxidant effect in clinical trials and has been found to promote cancer cell death in the laboratory.

International research: having a cup of coffee can improve memory:

The researchers asked 160 infrequent coffee drinkers to take a test. They looked at photos of seahorses, baskets, saxophones, etc., and were asked to identify whether the items belonged to indoor or outdoor. Five minutes later, some people took 200mg caffeine pills, the equivalent of two cups of espressos, while others took non-caffeinated placebo pills.

Then 24 hours later, the two groups looked at another batch of pictures, which contained the old pictures they had seen the day before, but only slightly changed from the new ones, to test whether the two groups could distinguish between the previous day's pictures.

The results showed that both groups were able to identify which pictures were from the previous day and which were new ones, but those who took caffeine pills were more able to identify the correct pictures from similar pictures.

Research leader Michael Yassa, who published the study in the journal Nature Neuroscience, said: "the results of this experiment tell me that I should continue to drink my coffee. "it has substantial benefits for learning and memory, and other studies have also mentioned the relationship between coffee and longevity and can delay Alzheimer's disease.

However, experts also warn that caffeine can have certain side effects on the human body, such as nervousness or anxiety, so it is still necessary to drink a certain amount of caffeine.

In 1991, the team classified coffee as "possibly carcinogenic", but many studies have since confirmed that regular coffee drinkers have lower rates of heart disease, type 2 diabetes, neurological diseases and several cancers.

In the dietary guidelines issued in 2015, the panel also believes that there is strong evidence that drinking 5 cups of coffee a day will not cause harm to the body, and that drinking a moderate amount of coffee may help reduce chronic diseases.

A report from the World Cancer Research Fund points out that drinking coffee can prevent a variety of cancers.

However, instead of strongly recommending coffee, the team classified coffee as a category 3 carcinogen: insufficient epidemiological evidence and animal experimental evidence was insufficient or could not be classified into other categories. Such substances also include fluoride, low-frequency magnetic fields and toluene.

The report also points out that scientists believe that drinking "very hot" drinks (more than 65 ℃) is the possible cause of cancer, as studies have shown that this behavior is associated with esophageal cancer. Hot drinks can damage cells on the surface of the throat and thus provide a stage for cancer cells to grow.

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