A pooled analysis of nine prospective studies involving more than 750,000 adults found that recommended amounts of leisure-time physical activity were linked to a lower risk for seven cancers, with several cancer types having a “dose/response” relationship. The study was led by investigators at the National Cancer Institute, the American Cancer Society and the Harvard T.H. Chan School of Public Health and appeared in the Journal of Clinical Oncology.While it has long been known that physical activity is associated with a lower risk of several cancers, it has been less clear about the shape of the relationship and whether recommended amounts of physical activity are associated with lower risk. Updated guidelines for activity suggest people should aim for 2.5 to 5 hours per week of
