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# Breastfeeding cuts the risk of breast cancer - new study
- URL: https://www.foodconsumer.org/breastfeeding_brast_cancer_0313130714/
- Published: 2013-03-13T20:13:00.000Z
- Updated: 2026-09-22T15:46:50.000Z
- Description: Yumia Sugawara's team followed 26,680 Japanese women aged 40 to 79 for 11 years. Compared with mothers who only breastfed, those who only bottle-fed were 80% more likely to develop breast cancer and 236% more likely to develop endometrial cancer.
- Author: Food Consumer
- Tags: Lifestyle, Health News, #vivvo-import

By Jimmy Downs

Wednesday March 13, 2013 (foodconsumer.org) -- A new study in European Journal of Cancer Prevention suggests that women breastfeeding their babies may help reduce their risk of developing breast cancer and endometrial cancer. 

Yumia Sugawara and colleagues conducted the study and found women who did both breastfeeding and bottle feeding and those who only bottle fed their babies were 12 and 80 percent more likely to develop breast cancer respectively, compared with those only breastfeeding their babies.

The study also found that women both breastfeeding and bottle feeding their babies and those only bottle feeding their babies were 32 and 236 percent more likely to develop endometrial cancer, compared with those who breastfed only.

The data used for the study came from 26,680 women aged 40 to 79 registered in the Ohsaki National Health Insurance Cohort Study who were followed up for a 11-year period during which 148 cases of breast cancer and 32 cases of endometrial cancer were identified.

The researchers said in their study report "Our findings appear to raise the possibility that nonbreastfeeding is positively associated with the risks for both breast cancer incidence and endometrial cancer incidence."