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Women can reduce their risk of breast cancer by first developing better food habits, maintaining healthy weight, increasing physical activity, reducing alcohol use, and breast feeding. These modifications might prevent 38% of breast cancers in the US, 42% in the UK, 28% in Brazil and 20% in China. Recents studies have discovered a association with dietary inflammatory potential Though there are no definitive evidence, certain studies have illustrated that there is some sort of association between diets and the risk of breast cancer.

Being overweight after menopause increases breast cancer risk. Before menopause, ovaries make most of the estrogen in the body and fat tissue makes a small amount. After menopause, most of a woman's estrogen comes from fat tissue. Having an increase of fat tissue after menopause can raise estrogen levels and raise chances of getting breast cancer. The benefits with moderate exercise such as brisk walking are seen at all age groups including postmenopausal women. High levels of physical activity reduce the risk of breast cancer by about 14%. Strategies that encourage regular physical activity and reduce obesity could also have other benefits, such as reduced risks of cardiovascular disease and diabetes. Risk increases with the amount of alcohol consumed. Those who drink 2 to 3 alcoholic drinks a day have a 20% higher risk compared to women who don't drink alcohol. Breastfeeding longer than the recommend six month can also provide additional protection. Most women who breastfeed experience hormonal changes during lactation that delay their menstrual periods. These changes reduce a women's lifetime exposure to hormones like estrogen, which can promote breast cancer cell growth.

High intake of citrus fruit has been associated with a 10% reduction in the risk of breast cancer.

Marine omega-3 polyunsaturated fatty acids appear to reduce the risk. High consumption of soy-based foods may reduce risk.