流行病学研究发现,在癌症发病率低的地方,人们饮食中蔬菜、水果的比例较大。进一步研究发现,蔬菜、水果有很好的防癌作用。因此,欧美流传着要想防癌,多吃水果、蔬菜的说法。蔬菜、水果为什么能防癌呢?一般认为,这是蔬菜、水果中的维生素、粗纤维和微量元素在起作用。其实,这种看法并不全面。1990年,美国国立癌症研究所为弄清蔬菜、水果预防癌症的物质基础和作用机理,耗资2000多万美元进行了研究,结果发现,蔬 Epidemiological studies have found that in places where the incidence of cancer is low, people have a large proportion of vegetables and fruits in their diet. Further research found that vegetables, fruits have a good anti-cancer effect. Therefore, the spread of Europe and the United States want to prevent cancer, eat more fruits and vegetables. Why can vegetables and fruits prevent cancer? It is generally believed that this is a vegetable, fruit vitamins, crude fiber and trace elements at work. In fact, this view is not comprehensive. In 1990, the National Cancer Institute to clarify the vegetables and fruits of the material basis and mechanism of cancer prevention, costing more than 20 million US dollars were studied and found that vegetables