通过预防癌症，人群中的新发癌症病例将减少。
By preventing cancer, the number of new cases of cancer in a group or population is lowered.
“毫无疑问，通过选择不同的食物，人们可以在改善糖尿病和高血压、甚至预防癌症方面取得很大进展。”纳多说。
"There's no question people can take things a long way toward reversing diabetes, reversing high blood pressure, even preventing cancer by food choices," Nadeau says.
通过检查可获得的证据，专家声称每日补充硒，并不能预防癌症。
Taking a daily supplement of selenium will not ward off cancer, say experts who have reviewed the available evidence.
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