Postmenopausal breast cancer risk: Intensity and timing of exercise

Intensity and timing of physical activity in relation to postmenopausal breast cancer risk: the prospective NIH-AARP Diet and Health Study

"A high level of recent, but not historical, physical activity of moderate-to-vigorous intensity is associated with reduced postmenopausal breast cancer risk."

BMC Cancer. 2009 Oct 1;9(1):349.

Soy reduces the risk of postmenopausal breast cancer

In this study the urinary excretion of genistein was measured.

Urinary phytoestrogen excretion and postmenopausal breast cancer risk: the multiethnic cohort study

"Our results provide some support to the hypothesis that a diet rich in isoflavones from soy products reduces the risk of postmenopausal breast cancer, particularly in populations with comparatively high excretion of phytoestrogens."

Cancer Prev Res (Phila Pa). 2009 Oct;2(10):887-94. Epub 2009 Sep 29.

Dietary Isoflavone and Breast Cancer Risk

The soybean (soya bean) contains the isoflavones genistein and daidzein.

Dietary isoflavone intake and breast cancer risk in case-control studies in Japanese, Japanese Brazilians, and non-Japanese Brazilians.
Isoflavones reduced the risk of breast cancer
Breast Cancer Res Treat. 2009 Jul;116(2):401-11.

Breast Cancer Risk in Smokers and Overweight Women

Weight History, Smoking, Physical Activity and Breast Cancer Risk among French-Canadian Women Non-Carriers of More Frequent BRCA1/2 Mutations.

Weight gain and smoking increased breast cancer risk.
Moderate physical activity decreased breast cancer risk.
Women at increased genetic risk for breast cancer were excluded from this study.

Journal of Cancer Epidemiology
Volume 2009 (2009), Article ID 748367, 11 pages
doi:10.1155/2009/748367

Related Link:
Breast cancer: Risk increases for smokers and overweight women - Eureka Alert.

Grapefruit intake and risk of breast cancer

Prospective study of the association between grapefruit intake and risk of breast cancer in the European Prospective Investigation into Cancer and Nutrition (EPIC).

"Grapefruit inhibits cytochrome P450 3A4 and may affect estrogen metabolism...
There was no association between grapefruit intake and estradiol or estrone among postmenopausal women. In this study, we found no evidence of an association between grapefruit intake and risk of breast cancer."

Cancer Causes Control. 2009 Aug;20(6):803-9.