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New data from Harvard’s Nurses’ Health Study II show that women who consumed one and a half or more servings of red meat per day had nearly double the risk of developing hormone-receptor-positive breast cancer compared with women consuming three or fewer servings of red meat per week. Hormone-receptor-positive breast cancer is the most common type of breast cancer and has been on the rise in recent years. This study involved more than 90,000 premenopausal women age 26 to 46 who completed food surveys during a 12-year period. Animal fat and red meat intake were found to increase premenopausal breast cancer risk in a previous analysis of the Nurses’ Health Study II. Possible reasons for this association include carcinogens produced as meat is cooked, hormones given to cattle for growth promotion, red meat’s high content of heme iron, which has been shown to increase estrogen-dependent tumor growth, and red meat’s high fat content. Cho E, Chen WY, Hunter DJ, Stampfer MJ, Colditz GA, Hankinson SE, Willett WC. Red meat intake and risk of breast cancer among premenopausal women. Arch Intern Med. 2006;166:2253-2259.
The Cancer Project News, Winter 2007
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