World Health Organization (WHO)
http://www.who.int/mediacentre/factsheets/fs297/en/

National Cancer Institute
www.cancer.gov

American Cancer Society
Guidelines on Nutrition and Physical Activity for Cancer Prevention
http://www.cancer.org/acs/groups/cid/documents/webcontent/002577-pdf.pdf

Physical Activity and Cancer Brochure
http://www.cancer.org/acs/groups/content/@nho/document/physicalactivityandcancerpdf.pdf

MD Anderson Cancer Center
http://www.mdanderson.org