Why you should let your tea cool off before sipping it

The ideal brewing temperature for green tea is believed to be between 70 and 80 deg C. PHOTO: ST FILE

(THE JAKARTA POST/ASIA NEWS NETWORK) - There are some ways to drink boiling hot tea and get away with it.

Sip slowly and the beverage warms us up. The tea will gradually cool down as you sip your way to the middle of the cup. That is a very satisfying experience for some, especially when it is raining or snowing outside.

Boiling hot tea, however, has recently been linked to oesophageal cancer. A new study that appeared in the Annals of Internal Medicine pointed out that very hot tea can harm the cells in the oesophagus.

"If the person also drinks alcohol and smokes, the harm will be heightened," said Professor Jun Lv from the Department of Epidemiology and Biostatistics at Peking University and the lead author on the study as quoted by The Telegraph.

Oesophageal cancer, the eighth most common cancer in the world, usually results from repeated injury to the oesophagus, often by smoke, alcohol, acid reflux and hot liquids. But drinking hot tea, at temperatures above 65 deg C, only contributes to cancer when it is accompanied by smoking and drinking alcohol excessively, according to Prof Lv.

The study also said excessive alcohol consumption is defined as 20ml or more of alcohol a day, about the amount found in a 350ml glass of beer or a 45ml shot of distilled spirits. Tobacco use was defined as smoking one or more cigarettes a day.

Mr Neal Freedman, senior investigator at the National Cancer Institute in Bethesda, Maryland, said very hot drinks could make the oesophagus more vulnerable to known cancer-causing agents such as alcohol and smoke. Fortunately, if you drink your tea the traditional British way with additional cold milk, the temperature drops to a safer level, unlike in Russia or the Middle East where very hot tea is commonly enjoyed out of a samovar that is constantly under heat.

Although tea is best enjoyed at 65 deg C, the tea leaves are ideally brewed at higher temperatures.

According to Ms Ratna Somantri, a renowned tea expert, black tea and tisane (herbal, flowers, fruit tea) are best brewed at a maximum temperature of 98 deg C. White tea and green tea have ideal brewing temperature of 70 to 80 deg C and oolong is 80 to 90 deg C.

Higher than that, green tea will become bitter, white tea can lose its sweet note, but the aroma can increase. Otherwise, if the water used for brewing tea is cooler than the ideal temperature, the aroma and flavour of tea will not come out to its best.

Moreover, Trixie Anindita from TWG Tea Indonesia added that tea in general is best brewed at a temperature just below boiling point, about 95 deg C, while special Japanese green tea and Chinese white tea need lower temperature, as low as 75 to 80 deg C. Tea leaves require oxygen to bring out their aroma and there is no more oxygen when water reaches boiling point.

At the end of the day, make use of hot water to brew your tea, but let it cool before your first sip.

Tea has many health benefits. According to a 2009 study in the journal Nature Reviews Cancer, components of tea leaves are reported to have antioxidant properties and may protect against other types of cancers, particularly colon and prostate cancer.

"Green tea has shown to be a little more effective in cancer inhibition versus black tea, but black tea is more effective in cardiovascular health," said Mr Peter Goggi, president of the Tea Association of the United States.

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