Summary: Drinking 4 or extra cups of black, inexperienced or oolong tea a day can reduce the risk of type 2 diabetes by 17%.
A supply: Diabetology
A scientific evaluation and meta-analysis of 19 cohort research involving greater than 1 million adults from eight nations discovered that average consumption of black, inexperienced, or oolong tea was related to a diminished risk of growing type 2 diabetes.
The findings, introduced at this yr’s annual assembly of the European Association for the Study of Diabetes (EASD) in Stockholm, Sweden (September 19-23), present that ingesting not less than 4 cups of tea a day is related to a 17% decrease risk. T2D inside a mean of 10 years.
“Our outcomes are fascinating as a result of they recommend that individuals can do one thing so simple as ingesting 4 cups of tea a day to reduce their risk of growing type 2 diabetes,” mentioned lead creator Xiaying Li of Wuhan University of Science and Technology in China.
Although common tea consumption has lengthy been recognized to have well being advantages resulting from varied antioxidant, anti-inflammatory, and anti-carcinogenic compounds in tea, the relationship between tea consumption and T2D risk is much less clear. To date, printed cohort research and meta-analyses have reported conflicting outcomes.
To deal with this uncertainty, researchers performed a cohort examine and dose-response meta-analysis to raised outline the relationship between tea consumption and future T2DM risk.
First, they studied 5199 adults (2583 males, 2616 girls) with out a historical past of T2D (imply age 42) from the China Health and Nutrition Survey (CHNS) enrolled in 1997 and operating till 2009. A Study of the Economy, Sociology, and Health of the Residents of Nine Provinces.
First, individuals accomplished a meals and beverage frequency questionnaire and offered data on way of life components comparable to common train, smoking, and alcohol use. Overall, 2,379 (46%) individuals reported ingesting tea, and 522 (10%) individuals developed T2D at the finish of the examine.
After adjusting for components related to an elevated risk of T2D, comparable to age, gender, and bodily inactivity, the researchers discovered that tea drinkers had an elevated risk of growing T2D in comparison with non-drinkers. Results didn’t change considerably when analyzed by age and intercourse, or when individuals with diabetes in the first 3 years had been excluded.
The subsequent step in the examine was a systematic evaluation of all cohort research analyzing tea consumption and T2D risk in adults (aged 18 years and older) till September 2021. In whole, 19 cohort research concerned 1,076,311 individuals from eight nations  included in a dose-response meta-analysis.
They examined the potential results of differing types of tea (inexperienced tea, oolong tea, and black tea), and frequency of tea ingesting (lower than 1 cup/day, 1-3 cups/day, and 4 or extra cups/day). gender (female and male), and examine location (Europe and America, or Asia), on the risk of T2D.
Overall, the meta-analysis discovered a linear relationship between tea consumption and T2D risk, with every cup of tea consumed per day decreasing the risk of growing T2D by 1%.
Compared to adults who didn’t drink tea, those that drank 1-3 cups a day had a 4% decrease risk of T2D, and people who drank not less than 4 cups a day had a 17% decrease risk.
The associations had been noticed regardless of the type of tea the individuals drank, whether or not they had been male or feminine, or the place they lived, suggesting that it could be the quantity of tea slightly than one other issue that performs a main function.
“Although extra analysis is required to find out the actual dosage and mechanisms behind these observations, our findings recommend that tea consumption is helpful in decreasing the risk of type 2 diabetes, however solely at excessive doses (not less than 4 cups per day),” says Lee.
He provides: “Certain parts in tea, comparable to polyphenols, could decrease blood glucose ranges, however ample quantities of these bioactive compounds could also be required to be efficient. This could clarify why we didn’t discover an affiliation between tea ingesting and type 2 diabetes in our cohort examine, as we didn’t have a look at larger tea consumption.
Oolong tea is a conventional Chinese tea comprised of the similar plant used to make inexperienced and black tea. The distinction is in how the tea is processed—inexperienced tea shouldn’t be allowed to oxidize a lot, black tea is allowed to oxidize to black, and oolong tea is partially oxidized.
Despite the necessary findings, the authors word that the examine is observational and doesn’t show that tea consumption reduces the risk of T2D, however means that it contributes.
The researchers word a number of caveats, together with that they relied on subjective assessments of the quantity of tea consumed and can’t rule out the chance that residual confounding from different way of life and physiological components could have affected the outcomes.
About this diabetes analysis information
Author: Judy Naylor
A supply: Diabetology
The connection: Judy Naylor – Diabetology
Photo: Image is in the public area
Original analysis: The findings can be introduced at the annual assembly of the European Association for the Study of Diabetes