According to a study conducted at the Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute in Nagoya, Japan, the traditional dietary habits of the women in this country may be responsible for their relatively low breast cancer rates. Researchers noted that in particular, “The protective effects of the Japanese diet were more prominent among postmenopausal than premenopausal women.”

Hirose K, Takezaki T, Hamajima N, Miura S, Tajima K. Dietary factors protective against breast cancer in Japanese premenopausal and postmenopausal women. Int J Cancer. 2003 Nov 1;107(2):276-82.