Why tea is good for you and how to make the perfect cup

Drinking at least 4 cups of certain teas may reduce risk of type 2 diabetes, study finds

Drinking at least four cups of one of these teas a day has been linked to a 17% reduction in the risk of developing type 2 diabetes over an average of 10 years, according to a study published on Saturday. The research, which has not yet been published in a scientific journal, will be presented this week at the annual meeting of the European Association for the Study of Diabetes in Stockholm.

The relationship between tea consumption and the risk of type 2 diabetes has been studied before, but the results have been inconsistent, said Xiaying Li, first author of the research and a postgraduate student at the University of Science and Technology. from Wuhan in China.

“Our study showed that the association between tea drinking and (type 2 diabetes) depended on the amount of tea consumed. Only enough tea drinking can show clinical effects,” Li said via email. . “Based on our findings, I would advise the public to consume more tea in their daily lives, if appropriate.”

The abstract authors first studied 5,199 adults with no history of type 2 diabetes who had participated in the China Health and Nutrition Survey (CHNS). The CHNS is a prospective study examining the economy, sociological issues, and health of residents of nine Chinese provinces. They were recruited in 1997 and followed until 2009. At the start of the study, participants provided information on lifestyle factors such as eating and drinking habits, exercise, smoking and Alcohol consumption.

Initially, the researchers found that tea drinkers and non-drinkers in their study had a similar risk of getting type 2 diabetes.

But when researchers set out to find out whether the amount consumed by tea drinkers made a difference by undertaking a systematic review of 19 cohort studies involving more than one million adults from eight countries, the results were different – the more it The more cups of green, oolong or black tea participants drank daily, the lower their risk of developing type 2 diabetes. The measures tracked in these studies were whether participants drank less than one cup of tea per day, one to three cups per day, or four or more.)

The authors cautioned that their research does not prove that drinking tea reduces the risk of type 2 diabetes, but suggests that drinking tea likely contributes, according to a press release. They also noted that they relied on participants’ own assessments of their tea consumption and could not rule out the possibility that unmeasured physiological and lifestyle factors may have affected the results.

Experts who were not involved in the research agree with the authors’ acknowledgment of the shortcomings of current research.

“It could be that people who drink more tea avoid or drink more harmful or equivalent sugary drinks less often, or have other health behaviors that lead them to have lower risk of type 2 diabetes” , said Naveed Sattar, professor of metabolic medicine. at the University of Glasgow, said in a statement.

“The results should be taken with a very large pinch of salt (or a cup of tea),” Kevin McConway, emeritus professor of applied statistics at the Open University in the UK, said in a statement. “The problem with the results of meta-analyses is that the devil is always in the details, and we don’t have the details. Which studies were included? How good were they? Which people, from which countries, have been studied?

More research needs to be done to determine exactly how green, black or oolong tea — and the amount consumed — might affect the risk of type 2 diabetes, Li said in a press release.

“Special components of tea, such as polyphenols, can reduce blood glucose concentration by inhibiting the activity of α-glucosidase and/or inhibiting the activity of other enzymes, but a sufficient amount of the bioactive substance is needed to be effective,” Li said.

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Polyphenols are substances found in many plants and give their color to certain flowers, fruits and vegetables, according to the National Cancer Institute. Polyphenols have antioxidant properties, which can help prevent or delay cell damage in the body. Bioactive substances are nutrients or non-nutrients contained in food that affect the functioning of the body.

The take-home message is that lifestyle choices are important in managing the risk of type 2 diabetes, Duane Mellor, registered dietitian and senior lecturer at Aston University Birmingham in the UK, said in a statement. Mellor was not involved in the research.

In addition to boiling your kettle, exercising regularly, eating enough fruits, vegetables and grains, and using alternative sweeteners have also been associated with both a lower risk of developing type 2 diabetes or to better disease management.

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