Dairy Food, Calcium, and Risk of Cancer in the NIH-AARP Diet and Health Study.
This study was done over an average of 7 years. Total cancer was lower in women but not in men with the maximal benefit at 1300 mg per day. Colorectal cancer was lower in both men and women.
Arch Intern Med. 2009 Feb 23;169(4):391-401.
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Calcium may cut colorectal cancer risk [Reuters].
Calcium Linked to Lower Colon Cancer Risk, Study Finds [New York Times].