A large, prospective cohort study carried out in Japanese seniors has found that consumption of green tea is significantly associated with a lower risk of developing functional disability (problems with daily activities, such as bathing or dressing). Information on daily green tea consumption and other lifestyle factors was collected via questionnaire from 13,988 Japanese individuals aged 65 or over, and subjects were followed up for three years. The results showed an inverse relationship between functional disability risk and the consumption of green tea – the more green tea people drank, the lower their disability risk. Nearly 13% of those who consumed less than one cup of green tea each day developed functional disability, compared to slightly more than 7% among those consuming five cups or more daily. (Green tea consumption and the risk of incident functional disability in elderly Japanese: the Ohsaki Cohort 2006 Study. Am J Clin Nutr. 2012 Mar;95(3):732-9).