绿茶防痴呆，亚洲人效果好

Core Viewpoint - Green tea has multiple health benefits, particularly in protecting cognitive function and reducing the risk of dementia, with studies from China and Japan confirming its effectiveness, especially among Asian populations [1][2]. Group 1: Research Findings - A meta-analysis conducted by researchers from Macau University and the University of Macau reviewed 18 observational studies involving 58,929 participants, finding that green tea consumption is negatively correlated with cognitive decline, reducing the risk of cognitive decline by 37%, particularly in individuals aged 50-69 [1]. - The same meta-analysis indicated that green tea can lower the risk of dementia by 25% and the risk of mild cognitive impairment by 36%, with significant cognitive protective effects observed in Asian populations, while no such effects were noted in European populations [1]. - A study by Niigata University in Japan tracked 13,660 residents with an average age of 59 over 12 years, revealing that higher green tea consumption correlates with a lower risk of dementia, with each additional cup (approximately 150 milliliters) reducing dementia risk by about 4.8% [1]. Group 2: Mechanism and Recommendations - Researchers attribute the cognitive protective effects of green tea to its polyphenol content, but they advise against excessive consumption solely for dementia prevention, emphasizing the need for large-scale longitudinal studies to understand the long-term effects and individual differences in green tea consumption [2].