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近年来已有充分证据表明70％～90％的癌症的发生与环境因素有关,其中由饮食、吸烟等生活方式引起的癌症所占比重较大。饮食因素对癌症发病的影响已有大量的流行病学与实验室研究的证据。例如移民流行病学研究表明,从胃癌高发、结肠癌低发的日本,移居到胃癌低发、结肠癌高发的美国的移民,随着移居的时间,胃癌发病病率逐渐下降,而结肠癌发病率逐渐上升,到了第二、三代,移民的发病率已有
In recent years, there is sufficient evidence that about 70% to 90% of cancers are related to environmental factors. Among them, the proportion of cancers caused by diet, smoking and other lifestyles is relatively large. The impact of dietary factors on the incidence of cancer There is a lot of evidence from epidemiological and laboratory studies. For example, immigration epidemiological studies show that from the high incidence of gastric cancer, colon cancer low incidence of Japan, immigrate to low stomach cancer, high incidence of colon cancer in immigrants, with the migration of time, the incidence of gastric cancer decreased, and colon cancer The rate gradually increased, to the second and third generation, the incidence of immigrants have been