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Our culture of sitting may be responsible for 173,000 cases of cancer each year, according to new estimates.

Physical inactivity is linked to as many as 49,000 cases of breast cancer and 43,000 cases of colon cancer a year in the United States, said Christine Friedenreich, an epidemiologist at Alberta Health Services-Cancer Care in Canada.

Breast and colon cancer appear to be the cancers most influenced by physical activity, according to the research we have to date, Friedenreich said, in presenting her findings here today (Nov. 3) at the American Institute for Cancer Research (AICR) conference.

But her study also suggested that an estimated 37,200 cases of lung cancer, 30,600 cases of prostate cancer, 12,000 cases of endometrial cancer and 1,800 cases of ovarian cancer could be prevented if people were more physically active.

Read more: http://vitals.msnbc.msn.com/_news/20...ur-cancer-risk