Abstract: Consuming 4 or extra cups of black, inexperienced, or oolong tea day by day was related to a 17% decrease threat of growing Sort 2 diabetes.
A scientific evaluation and meta-analysis of 19 cohort research involving greater than 1 million adults from eight international locations finds that average consumption of black, inexperienced or Oolong tea is linked to a decrease threat of growing sort 2 diabetes.
The findings, being introduced at this yr’s European Affiliation for the Examine of Diabetes (EASD) Annual Assembly in Stockholm, Sweden (19-23 Sept), counsel that consuming a minimum of 4 cups of tea a day is related to a 17% decrease threat of T2D over a mean interval of 10 years.
“Our outcomes are thrilling as a result of they counsel that individuals can do one thing so simple as consuming 4 cups of tea a day to probably reduce their threat of growing sort 2 diabetes,” says lead creator Xiaying Li from Wuhan College of Science and Expertise in China.
Whereas it is lengthy been identified that often consuming tea could also be useful for well being due to the varied antioxidant, anti-inflammatory and anticarcinogenic compounds tea comprises, much less clear has been the connection between tea consuming and the chance of T2D. Up to now, printed cohort research and meta-analyses have reported inconsistent findings.
To handle this uncertainty, researchers carried out a cohort research and a dose-response meta-analysis to higher outline the connection between tea consumption and future T2DM threat.
First, they studied 5,199 adults (2583 males, 2616 girls) with no historical past of T2D (common age 42) from the China Well being and Vitamin Survey (CHNS), who had been recruited in 1997 and adopted till 2009. The CHNS is a multicentre potential research trying on the economics, sociological points and well being of residents from 9 provinces.
On the outset, members stuffed in a foods and drinks frequency questionnaire and supplied info on way of life elements reminiscent of common train, smoking and alcohol consumption. Total, 2,379 (46%) members reported consuming tea, and by the top of the research, 522 (10%) members had developed T2D.
After adjusting for elements which can be identified to be linked with elevated threat of T2D, like age, intercourse, and bodily inactivity, researchers discovered that tea drinkers had an identical threat of growing T2D in comparison with non-drinkers. And the outcomes didn’t change considerably when analyzed by age and intercourse, or when members who developed diabetes throughout the first 3 years of follow-up had been excluded.
Within the subsequent step of the research, the researchers did a scientific evaluation of all cohort research investigating tea consuming and the chance of T2D in adults (aged 18 or older) as much as September 2021. Total, 19 cohort research involving 1,076,311 members from eight international locations  had been included within the dose-response meta-analysis.
They explored the potential impression of several types of tea (inexperienced tea, oolong tea, and black tea), frequency of tea consuming (lower than 1 cup/day, 1-3 cups/day, and 4 or extra cups/day), intercourse (female and male), and the placement of the research (Europe and America, or Asia), on the chance of T2D.
Total, the meta-analysis discovered a linear affiliation between tea consuming and T2D threat, with every cup of tea consumed per day lowering the chance of growing T2D by round 1%.
When put next with adults who did not drink tea, those that drank 1-3 cups day by day lowered their threat of T2D by 4%, whereas those that consumed a minimum of 4 cups day-after-day decreased their threat by 17%.
The associations had been noticed no matter the kind of tea members drank, whether or not they had been male or feminine, or the place they lived, suggesting that it could be the quantity of tea consumed, fairly than every other issue, that performs a serious function.
“Whereas extra analysis must be completed to find out the precise dosage and mechanisms behind these observations, our findings counsel that consuming tea is helpful in lowering the chance of sort 2 diabetes, however solely at excessive doses (a minimum of 4 cups a day)” Li says.
She provides, “It’s doable that specific elements in tea, reminiscent of polyphenols, might scale back blood glucose ranges, however a ample quantity of those bioactive compounds could also be wanted to be efficient. It might additionally clarify why we didn’t discover an affiliation between tea consuming and sort 2 diabetes in our cohort research, as a result of we didn’t take a look at greater tea consumption.”
Oolong tea is a conventional Chinese language tea that is constituted of the identical plant used to make inexperienced and black teas. The distinction is how the tea is processed—inexperienced tea is just not allowed to oxidise a lot, black tea is allowed to oxidise till it turns black, and oolong tea is partially oxidised.
Regardless of the vital findings, the authors observe that the research is observational and can’t show that consuming tea reduces the chance of T2D, however means that it’s more likely to contribute.
And the researchers level to a number of caveats, together with that they relied on subjective assessments of the portions of tea consumed they usually can not rule out the likelihood that residual confounding by different way of life and physiological elements might have affected the outcomes.
About this diabetes analysis information
Writer: Judy Naylor
Contact: Judy Naylor – Diabetology
Picture: The picture is within the public area
Unique Analysis: The findings shall be introduced at The European Affiliation for the Examine of Diabetes Annual Assembly