If you are looking for a drink to replace coffee to reduce caffeine intake, 'black tea' is a good choice.
When comparing the same weight of tea leaves and beans, tea leaves contain more caffeine. However, since the amount of tea leaves used for brewing black tea is smaller, the actual amount of caffeine in black tea is one-third that of coffee if you drink one cup of coffee and black tea. Find out about the various effects of black tea you didn't know about.
Black tea prevents dementia.
According to a study published in the American nutritional journal 'Journal of Clinical Nutrition,' black tea may reduce the risk of cognitive impairment, a pre-stage of senile dementia (Alzheimer's). Researchers at the University of Singapore studied the association between the frequency of tea consumption and cognitive function changes in 2,500 men and women over the age of 55 for about two years. As a result, those who drank two or three cups of black tea a day were 55% less likely to have cognitive decline than those who did not. A study conducted by a research team at the University of Singapore on 957 adults 55 years of age and older also confirmed the effect of black tea in preventing dementia. Those who regularly drank black tea and other teas had a 50% lower risk of cognitive decline than those who rarely drank tea. In particular, if people with a gene associated with Alzheimer's disease (AOPE e4) drank tea regularly, their risk of dementia was lowered by 86%. The research team analyzed that catechins and theaflavins contained in tea have anti-inflammatory and antioxidant effects, which can prevent cerebrovascular damage or brain neurodegeneration.
Black tea is good for cerebrovascular health.
There are also studies showing that black tea is beneficial for cerebrovascular health. A research team at Karolinska Medical University in Sweden followed 74,961 people for 10 years, and found that drinking a lot of black tea was associated with a lower risk of blockage of blood vessels in the brain due to blood clots. Those who drank four or more cups of black tea a day had a 21% lower risk of developing blood clots in the brain than those who never drank at all. It was analyzed that black tea is rich in antioxidants that are good for heart and cerebrovascular health.
Black tea is also good for dental health.
According to the results of a study at Hokkaido Medical University in Japan, black tea is effective in suppressing the occurrence of gum disease and bad breath. This is because 'polyphenol', an antioxidant rich in black tea, inhibits the growth of gingivalis bacteria that cause gum disease. In fact, about 20% of dried black tea leaves are polyphenols, which is 5~9% more than green tea. In addition, polyphenols have effects such as antibacterial, anticancer, antiallergic, and inhibition of oxidation in vivo.
For these reasons, it is recommended to drink black tea. Black tea is beneficial to health in many ways.