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Coffee and tea are widely consumed around the world. In Japan and other Asian countries, greentea is a popular beverage, whereas in the Western countries, blacktea is popular. Recently, researchers from Kanazawa University found that greentea can help to prevent neurodegenerative Alzheimer's disease (AD).
Researchers conducted a population-based prospective study with Japanese residents aged >60 years from Nakajima, Japan to investigate the incidences of Alzheimer's disease from 2007 to 2013. Participants received an evaluation of cognitive function and blood tests. The consumption of greentea, coffee, and black tea was also evaluated at baseline.
Of 723 participants with normal cognitive function at a baseline survey (2007-2008), 490 completed the follow up survey in 2011-2013. The incidence of dementia during the follow-up period was 5.3%, and that of MCI was 13.1%. The multiple-adjusted odds ratio for the incidence of overall cognitive decline was 0.32 among individuals who consumed green tea every day and 0.47 among those who consumed green tea 1-6 days per week compared with individuals who did not consume green tea at all. The multiple-adjusted odds ratio for the incidence of dementia was 0.26 among individuals who consumed green tea every day compared with those who did not consume greentea at all.
No association was found between coffee or black tea consumption and the incidence of dementia or MCI. The results indicate that greentea consumption is significantly associated with reduced risk of cognitive decline, even after adjustment for possible confounding factors.
The research has been published online in the PLOS ONE.
Greentea is made from the leaves from Camellia sinensis that have undergone minimal oxidation during processing. it originated in China,[1] but it has become associated with many cultures throughout Asia. it has recently become relatively widespread in the West, where black tea has been the traditionally consumed tea. it has become the raw material for extracts used in various beverages, health foods, dietary supplements, and cosmetic items.[2] Many varieties of green tea have been created in the countries where it is grown. These varieties can differ substantially due to variable growing conditions, horticulture,[3] production processing, and harvesting time.
Over the last few decades it has been subjected to many scientific and medical studies to determine the extent of its long-purported health benefits, with some evidence suggesting that regular one drinkers may have a lower risk of developing heart disease[4] and certain types of cancer.[5] Although it does not raise the metabolic rate enough to produce immediate weight loss, its extract containing polyphenols and caffeine has been shown to induce thermogenesis and stimulate fat oxidation, boosting the metabolic rate 4% without increasing the heart rate.[6]
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