咖啡豆是一种含有1000多种复杂成分的果实,科学家只对其中极少数的几种进行过单独的研究。咖啡豆中不仅含有多种抗氧化剂成分,而且还是美国人饮食中抗氧化剂的大量来源。美国人平均每天饮用咖啡3.1杯,有些人每天甚至饮用多达4～12杯咖啡。美国科学家最近研究发现,饮用咖啡有助于预防多种健康杀手,其中包括心血管疾病、癌症、糖尿病、肝脏疾病以及阿尔茨海默病等。例如,研究人员在病例对照研究中发现,与不饮咖啡者相比, Coffee beans are a fruit that contains more than 1,000 complex ingredients, and scientists have conducted separate studies on only a handful of them. Coffee beans contain more than just a variety of antioxidants, but also a large source of antioxidants in the American diet. On average, Americans drink 3.1 cups of coffee a day, and some even drink up to 4 to 12 cups of coffee a day. Recent research by U.S. scientists found that drinking coffee helps prevent many health killers, including cardiovascular diseases, cancer, diabetes, liver disease and Alzheimer’s disease. For example, researchers found in case-control studies that, compared with non-drinkers,