肥胖可增加乳腺癌的患病率。目前一般用 BMI 评估肥胖相关的乳腺癌风险,BMI 越高,患癌风险越高。一项针对中国人的研究显示:BMI>28 kg/m2(皮下脂肪增多为主)的女性更容易患激素受体阳性的乳腺癌,而腰臀比(waist to hip ratio,WHR)>0.85(内脏脂肪增加为主)的女性更容易患激素受体阴性的乳腺癌39。
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