这就是目前的现状。研究员分析了10项不同的前瞻性研究的数据，这些数据涉及18万名50岁以上的女性，研究员对她们跟踪研究了10年。数据显示，在此期间，近7000名妇女被诊断出患有乳腺癌。

Compared to postmenopausal women who maintained a stable weight over approximately 10 years, the researchers found that women who lost weight—even as little as 4.5 pounds—had a 13 percent lower risk of developing breast cancer. And more weight lost led to an even greater impact on cancer risk—at 20 pounds of sustained weight loss, women cut their risk of breast cancer by about 25%, Teras told NBC News. (The researchers accounted for other risk factors that can impact obesity and/or breast cancer risk, like physical activity levels and whether the women were on hormone replacement therapy.)

研究员发现在这10年内，与体重基本保持稳定的绝经女性相比，减肥的女性（即便只减了4.5磅）患乳腺癌的风险降低了13%。而减重更多对患癌率的影响也更大——减肥20磅左右的女性患乳腺癌的风险降低了25%，泰拉斯对《美国全国广播公司资讯》说道。（研究员表示其它因素也可能影响肥胖和/或乳腺癌风险，例如女性的锻炼水平以及是否接受激素替代治疗。）

"This is particularly important for the 40 percent of women worldwide, who are overweight or obese and therefore at higher risk for breast cancer," says Teras. "Given that breast cancer is the most commonly diagnosed cancer in women, the question of whether weight loss can reduce breast cancer risk is of great public health importance."

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