Now a small study of two dozen women may point to an answer: soy seems to keep circulating levels of estrogen low, which in turn inhibits breast cells from proliferating.

• 现在对24名妇女进行的一项小型研究可能给出了答案：大豆似乎可以降低体内循环的雌激素的水平，其转而又可以抑制乳腺癌细胞的扩散。