我是不爱喝咖啡的，但我的同事们对咖啡真能算爱得深沉，甚至有需要咖啡续命、不来一杯不算清醒的朋友。咖啡中含有咖啡因和多酚等活性物质，根据 统计数据，美国大约有85%的成年人每天都摄入咖啡因，平均摄入量为每天135mg（相当于360 ml咖啡）。 此前有不少研究发现，咖啡因与减轻氧化应激和神经炎症有关，具有一定的神经保护作用。此外，咖啡因还可能影响到多个阿尔茨海默病（AD）相关病 理过程，因此，咖啡与认知健康之间的关系非常受关注。 今日，JAMA发表了一项来自哈佛大学公共卫生学院科研团队的研究，研究者们分析了美国两项大型队列，共计13万余人43年的长期随访数据，就咖啡/咖 啡因摄入与认知之间的关系给出了答案。 分析结果显示，咖啡/咖啡因摄入较高与较低的痴呆风险显著相关，摄入量四分位最高组相较最低组痴呆风险降低18%，主观认知衰退风险降低15%。在 NHS队列中，咖啡因摄入量越高，客观认知表现越好。 当然，咖啡因不只来自咖啡，一些功能性饮料和茶中也有不少咖啡因。研究者指出，每天喝2-3杯咖啡或1到2杯茶时，咖啡因与认知的相关性最显著。 嘿嘿，咖啡我虽然不喝，但我喝茶呀。红白黄黑青，走起！ 这项研究的数据来自两个我们 ...

Core Points - A bipartisan group of U.S. lawmakers has introduced a bill to exempt all coffee products from import tariffs, which could alleviate pressure on Brazilian coffee exports [1] - The U.S. government imposed a 50% tariff on Brazilian coffee in late July, leading to tight coffee supplies and soaring prices in the U.S. [1] - Brazil was once the largest coffee supplier to the U.S., accounting for one-third of total coffee imports [1] - Coffee prices in U.S. supermarkets rose by 20.9% year-on-year in August, according to the U.S. Bureau of Labor Statistics [1] - The introduction of tariffs has resulted in a 50% increase in Arabica coffee futures prices since the policy was implemented [1] - The proposed bill aims to retroactively exempt tariffs imposed since January 19 of this year, covering green coffee, roasted coffee, decaffeinated coffee, and coffee substitutes [1]