Dr. Takeshisano and MitsurusAsako at the Tokyo National Cancer Center Hospital pointed out in related comments: "People who like to drink green tea can continue to maintain this habit, but don't expect drinking green tea to reduce the risk of gastric cancer."
In the world, the current mortality rate ranks second in various cancer mortality. In recent decades, the incidence of gastric cancer is gradually declining, which may be mainly due to the increase in fresh vegetables and fruits in foods and reduced pickled foods. However, in Japan, regardless of gender, gastric cancer is still the first cause of cancer death. About 18%of cancer -related deaths are caused by gastric cancer.
Several studies have shown that the content of antioxidants in green tea is high, which can prevent cell damage and prevent cancer. Other studies also suggest that green tea can prevent gastric cancer, pancreatic cancer, bladder cancer and colon cancer.
However, in order to achieve the above effect, people drink 10 cups of green tea daily, and at the same time, it will significantly increase the intake of caffeine. There are also people who use green tea extract capsules to instead drink green tea.
Researchers investigated men and women who live in rural areas in Japan and are over 40 years old, mainly investigating the amount of green tea daily for these people. About 40%of people drink more than 5 cups of green tea daily, and 19%of people drink green tea daily below 1 cup.
In the process of tracking the survey, 419 people were diagnosed with gastric cancer, but the researchers did not find that the occurrence of gastric cancer was related to the amount of green tea they was drinking.
This forward -looking research (researchers will continue to track and investigate the people of the research) than previous research (always retrospectively investigating patients with cancer) more scientific research methods. In retrospective studies, patients with gastric cancer may reduce the amount of green tea, so the review of the situation of green tea in the past may also be uncertain, which will cause the research results to deviate.
One of the authors of the study, Dr. Chung-Chenghsieh at the University of Massachusetts said: "Although the research design is reasonable and the implementation is also better, this is only one of the large amounts of data. We need to conduct further intervention research. Court of the final conclusion. "
(Intern editor: Li Susu)