Coffee, Green Tea May Help Against Type 2 Diabetes

By Serena Gordon
HealthDay reporter

THURSDAY, October 22, 2020 (HealthDay News) – If you have type 2 diabetes and enjoy drinking green tea or coffee, new research suggests that you may be lowering your chances of premature death.

But you have to really I love these drinks. The study found that consuming four or more cups of green tea with two cups of coffee per day was linked to a 63% lower risk of death during the average five-year follow-up.

On their own, just one cup of coffee or green tea a day can reduce your risk of premature death by 12% to 15%, respectively.

“Familiar drinks such as green tea and coffee may have health benefits. We have shown that higher consumption of green tea and coffee was associated with reduced all-cause mortality, and their combined effect appeared to be additive in people with type 2 diabetes. ”said lead author Dr. Yuji Komorita, assistant professor at the Graduate School of Medical Sciences at Kyushu University in Fukuoka, Japan.

Komorita said it was not clear how either drink could improve health. Both contain nutrients that can reduce inflammation, among other health benefits. Since coffee and green tea were associated with an even lower risk of premature death, Komorita suggested that each may have different beneficial substances that work on different diseases.

But Komorita added an important caveat: This study was not designed to prove cause and effect. As an observational study, it can only find one association.

Komorita also pointed out that the researchers did not have a lot of information about the participants that could affect the outcomes, such as their education, income and family background.

The study included nearly 5,000 Japanese adults (mean age: 66) with type 2 diabetes. Almost 2,800 were men. Their health has been monitored for about 5 years.

Participants completed a long food and drink questionnaire that asked how much green tea and coffee they had on a daily basis. They were also asked questions about their lifestyle, such as how much exercise they were doing, drinking and smoking habits, and how much sleep they typically got.

Only around 600 participants did not drink green tea. About 1,000 did not drink coffee.


Of those who drank green tea, more than 1,100 drank up to one cup per day, nearly 1,400 drank two to three and nearly 1,800 drank at least four cups per day, according to the results. For coffee drinkers, 1,300 had up to one cup per day, over 960 had a cup and 1,660 had two or more per day.

During the follow-up period, just over 300 participants died.

Compared with people who didn’t drink any drinks, participants who had green tea or coffee were less likely to die during the study, the researchers found. Those who drank both had the greatest reductions in the risk of death.

And, the more you drink, the lower your chances of dying, according to the study. People who drank more than four cups of green tea per day had a 40% lower risk – the same as those who had two or more cups of coffee. Those who drank only one of these drinks per day had a risk of premature death of 15% or less.

Dr Minisha Sood, an endocrinologist at Lenox Hill Hospital in New York City, was not involved in the study, but knows the results.

“The positive effects of green tea are not specific to people with diabetes,” she said. “It has been shown in multiple population studies that people in Japan who consume significant amounts of green tea have a lower death rate from all causes and cardiovascular disease.

Although researchers found a similar link for people with type 2 diabetes in Japan, Sood said the findings may not apply to the U.S. population. The quality of green tea in Japan is probably different, and so is the population, she explained.

“It is also important to be careful when interpreting the results of this study because this group of patients were, on average, non-obese patients with controlled blood pressure,” she said.

Dietitian Pat Talio also suspects that the quality of green tea may be different in Japan. She is the Outpatient Clinical Nutrition Program Coordinator at Northern Westchester Hospital in Mount Kisco, NY


More importantly, she noted, the amount the Japanese drink can be different and they don’t necessarily add cream and sugar.

“Green tea and coffee can be beneficial for everyone because they’re made from plants, and all plants – like fruits and vegetables – come with beneficial antioxidants and phytochemicals that can reduce inflammation. “she said.

Still, Talio added regarding hydration, “Water is our best bet. If you drink coffee or tea, think about how you drink it.” If you sweeten it and add milk or cream, you may be reducing its health benefits, she said.

The results were published online on October 21 in BMJ Open Diabetes Research and Care.

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