按照世界癌症研究基金会（the World Cancer Research Fund，WCRF）的观点，如果更多的美国人采取健康的生活方式，如吃得合理、经常锻炼、戒烟限酒、避免过多的日晒和防止乙肝病毒感染等，每年在美国可望预防34万癌症病例的发生。

该基金会认为“遵循上述健康的生活方式可以显著降低乳腺癌、胃癌和直肠癌的发病率。”据推算遵循健康的生活方式可降低上述癌症的发病率分别为38%、47%和45%。为了预防癌症，专家们建议大家每周至少进行中等强度的体育锻炼150分钟，后者可分5次完成，即每天进行30分钟的中等强度的有氧运动，如快走、慢跑或散步等。

按照世界癌症研究基金会提供的数据“就全世界而言，癌症是主要的致死性病因，每年新发现的癌症患者高达一千二百七十万，另有七百六十万人因癌症而死亡，30～40%的癌症可以预防和约三分之一的癌症患者如果能够早期发现和早期治疗完全可以治愈。”

Healthier Lifestyles May Prevent 340,000 U.S. Cancers a Year: Study

　　THURSDAY, Feb. 3 (HealthDay News) -- About 340,000 cancer cases in the United States could be prevented each year if more Americans ate a healthy diet, got regular exercise and limited their alcohol intake, according to the World Cancer Research Fund (WCRF).

　　These types of lifestyle changes could lead to significant reductions in particularly common cancers such as breast (38 percent fewer cases per year), stomach (47 percent fewer) and colon (45 percent fewer).

　　The research about how a healthy lifestyle can reduce cancer risk was released Feb. 3 to mark World Cancer Day. The WCRF said its findings are supported by the World Health Organization new Global Recommendations on Physical Activity for Health, a report that says that regular physical activity can prevent many diseases, including breast and colon cancer, cardiovascular disease and diabetes.

　　"Physical activity is recommended for people of all ages as a means to reduce risks for certain types of cancers and other non-communicable diseases," Dr. Tim Armstrong, of WHO Department of Chronic Diseases and Health Promotion, said in a WCRF news release.

　　"In order to improve their health and prevent several diseases, adults should do at least 150 minutes of moderate physical activity throughout the week. This can be achieved by simply walking 30 minutes five times per week or by cycling to work daily," he advised.

　　Other healthy lifestyle habits that reduce the risk of cancer include quitting smoking, avoiding secondhand smoke, avoiding excessive sun exposure, and preventing cancer-causing infections, the WCRF said.

　　Cancer is the leading cause of death worldwide. Each year, 12.7 million people are diagnosed with cancer and 7.6 million die from the disease. But 30 percent to 40 percent of cancers can be prevented and one-third can be cured through early diagnosis and treatment, according to the WCRF.

　　SOURCE: World Cancer Research Fund, news release, Feb. 3, 2011