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Green tea

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By: Sean Moloughney

Editor, Nutraceuticals World

Indication: Dementia risk

Source: Am J Clin Nutr, February 2006;83(2):355-361.

Research: In this study, researchers set out to examine the relationship between green tea and cognitive function. As such, researchers analyzed cross-sectional data from a community-based Comprehensive Geriatric Assessment (CGA) conducted in 2002 on 1003 Japanese subjects aged 70 years or older. They completed a self-administered questionnaire that included questions about the frequency of green tea consumption. Then research-ers evaluated cognitive function by using the Mini-Mental State Examination, which has a maximum score of 30 points. Three cut-offs were used to determine levels of cognitive impairment: less than 24 for severe, 24 to 26 for medium, and 26 to 28 for slight impairment.

Results: Using these measures, over 85% of people who drank less than three cups of green tea a week had some level of cognitive impairment. Nearly 60% of people who drank more than two cups a day had some level of cognitive impairment (nearly 40% with slight impairment). Researchers therefore concluded that people who drank more than two cups of green tea per day had a 50% lower chance of having cognitive impairment, compared to those who drank less than three cups a week.

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