Good news for tea and coffee lovers!

Are you a tea person? Or a coffee lover? If you are worried about your intake, here's some good news regarding the health benefits of drinking coffee and green tea.

According to a new observational study published in the online journal BMJ Open Diabetes Research & Care, coffee and green tea (if taken in a certain amount) have shown signs of lower mortality in type 2 diabetics. The researchers observed that drinking two or more cups of coffee and four or more cups of green tea each day lowered the all mortality rate by almost 63 percent.


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As part of the study, researchers from Kyushu University, Fukuoka Dental College, and Hakujyuji Hospital included 4,923 individuals in Japan with type 2 diabetes and studied their health for five years. Among the participants were 2,790 men and 2,133 women. Each of them was surveyed about their lifestyle, food habits, including their regular green tea and coffee consumption. They were also inquired about diet, exercise, smoking habits, alcohol consumption, and sleep patterns.

For green tea, the study showed:

  • 607 participants did not drink green tea at all
  • 1,143 drank 1 cup a day
  • 1,384 said they drank 2 to 3 cups a day
  • 1,784 reported drinking more than 4 cups a day

For Coffee:

  • 994 participants did not drink coffee
  • 1,306 drank up to 1 cup a day
  • 963 said they drank 1 cup every day
  • 1,660 reported drinking 2 cups

In five years, 309 participants died, mostly from cancer and cardiovascular disease. The study showed people who drank green tea or coffee or both had a much lower risk of mortality from diabetes, cancer, dementia, or circulatory diseases.

More precisely, green tea drinkers lowered their risk by 15% (up to one cup per day), 27% (two to three cups), and a whopping 40% (four or more cups). Coffee drinkers lowered their risk by 12%, 19%, and 41%, respectively. 

“The risk of death was even lower for those who drank both green tea and coffee every day: 51% lower for two to three cups of green tea plus two or more of coffee; 58% lower for four or more cups of green tea plus one cup of coffee every day; and 63% lower for a combination of four or more cups of green tea and two or more cups of coffee every day,” stated the study in their release. 

“This prospective cohort study demonstrated that greater consumption of green tea and coffee was significantly associated with reduced all-cause mortality: the effects may be additive,” the researchers concluded. 

Even with these beverages' substantial benefits, the researchers still emphasized a healthy lifestyle and food habit.

Limitations of the study:

Though it followed previous research on the health benefits of coffee and green tea, the study itself has some limitations. It was based on questionnaires completed by participants for five years, giving a possibility of inaccuracy in data. Also, the study was observational; it has not proven the benefits of tea and coffee. Instead, it just noted the correlation between drinking the beverages over a time period and mortality among diabetics.

Scientists believe that the high level of antioxidants in these beverages can be a reason behind the health benefits. But, if you are still wondering what is best for your health, it is better to consult your doctor or dietician. 

So, are you planning to drink that extra cup? Tell us in the comments below.