Drinking 4 cups of tea a day may reduce the risk of type 2 diabetes

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Drinking more than one cup of tea a day may reduce the risk of diabetes, according to a new study. Catherine Falls Ad/Getty Images
  • Researchers investigated the effects of different types of tea, such as green tea, oolong tea, and black tea, on diabetes risk.
  • They found that drinking 1-3 cups of tea slightly reduced the risk of type 2 diabetes, but drinking 4 or more cups of tea per day was linked to a 17% lower risk.
  • However, more studies are needed to confirm the results.

According to the World Health Organization, approximately 422 million people worldwide are living with diabetes. The most common type is type 2 diabetes, which occurs when the body cannot produce enough insulin or becomes resistant to insulin and cannot easily absorb insulin from the blood.

Some studies suggest that consuming Tea and coffee is linked to reduced all-cause mortality. Other Research It shows that daily consumption of green tea is linked to a lower risk of type 2 diabetes and a lower risk of death from all causes in people with diabetes.

Further study of the effects of tea and dosage on diabetes risk in large populations may inform preventative care strategies for diabetes.


Recently, researchers conducted a meta-analysis of 19 cohort studies from eight countries to investigate the effects of black, green, and oolong tea consumption on type 2 diabetes risk.

They found that drinking 4 or more cups of tea a day can reduce the risk of diabetes.

D., an associate professor at the University of Maryland Center for Diabetes and Endocrinology, who was not involved in the study. “Drinking tea does not appear to be harmful and may have a small benefit in reducing the risk of diabetes,” said Kashif M. Munir. , said Medical News Today“Other foods high in polyphenols have shown similar effects.”

The meta-analysis was presented at the European Diabetes Research Association Annual Meeting in Stockholm, Sweden.

For the study, the researchers analyzed data from 5,199 adult participants from the China Health and Nutrition Survey. Participants were not diabetic at the start of the study and were followed from 1997 to 2009. Tea consumptions were collected from questionnaires.

In total, 45.76% of participants reported drinking tea, and 10.04% of the cohort developed type 2 diabetes during the study period.

After adjusting for factors including age, gender, and lifestyle factors, the researchers found that tea drinkers had a similar risk of type 2 diabetes as non-tea drinkers.

Next, the researchers conducted a systematic review of 19 cohort studies with 1,076,311 participants that investigated the link between type 2 diabetes risk and tea consumption.

They were able to explore the association between type 2 diabetes risk and consumption of different types of tea, including green tea, oolong tea, and black tea, frequency of tea drinking, gender, and habitat.

Researchers found that those who drank 1-3 cups of tea a day had a 4% lower risk of type 2 diabetes than those who did not.


Those who drank at least four cups of tea a day had a 17% lower risk of type 2 diabetes than those who did not drink tea.

The researchers noted that their results remained independent of tea type, gender, and habitat. This suggested that the beneficial effects of tea on diabetes risk may be linked to the amount consumed, as opposed to other factors.

When asked how drinking tea might reduce the risk of type 2 diabetes, Dr. Munir said:

Tea is known to contain food polyphenols such as EGCG, which have been shown to reduce insulin resistance and improve endothelial function.[which is] important for regulating the immune response, blood clotting, and dilation or constriction of blood vessels). These effects may have beneficial effects on glucose homeostasis and may improve diabetes risk.”

Other studies They found that green tea could lower blood sugar levels by increasing insulin production in mice. Meanwhile, black tea is known to have high levels. theaflavinswith antioxidant and anti-inflammatory effects.

Black tea may also prevent obesity, a risk factor for diabetes. transition the conversion of white fat to brown fat, thus aiding in weight loss, blood sugar regulation and fat metabolism.

The researchers concluded that daily consumption of tea may reduce the risk of type 2 diabetes.

When asked about the limitations of the study, Professor of clinical and health sciences at the University of South Australia and also not involved in the study. Peter Clifton said: MNT As this study was epidemiological in nature, it can only highlight possible links.

He added that double-blind, randomized controlled trials of dry tea extract in capsules versus placebo need to be monitored for several years to achieve conclusive results.

“Recommending drinking tea or coffee as a lifestyle intervention isn’t going to work because people won’t suddenly change their ingrained no-tea-drinking habits. So there is no reason to give up, but there is not much evidence to accept.”
— prof. Peter Clifton

Dr. Munir added that the first small cohort study did not benefit from tea consumption, as it often required a larger number of participants to observe small effects on large populations.

“The meta-analysis included more than one million participants from 19 studies and showed benefits with higher tea consumption in conjunction with a lower risk of developing diabetes. Larger studies like this are often needed to derive a small benefit from a particular food,” he continued.

“However, the limitations are that we don’t know if food is causal or just an association with lower rates of developing diabetes, and many biases may interfere with nonrandomized studies,” he said.