在美国 ,营养因素大约与１／３的癌症死亡有关。对大多数美国非吸烟者而言 ,选择食物和体力活动强度是可以改变患癌风险的最重要的决定因素。因此 ,美国癌症协会定期地复习、更新和出版关于营养和体力活动指南 ,为美国公众提供现时的防癌信息。２００１年最新完成的指南如下 , In the United States, nutrition is about one-third of cancer deaths. For most non-smokers in the United States, choosing the intensity of food and physical activity is the most important determinant that can change the risk of cancer. As a result, the American Cancer Society regularly reviews, updates and publishes guidance on nutrition and physical activity to provide the American public with current anti-cancer information. The latest guidance completed in 2001 is as follows,