简述大豆异黄酮的生物学作用。
大豆异黄酮有苦涩味,其化学结构与雌二醇相似,能与之竞争雌激素受体而表现出拟雌激素作用。大豆异黄酮对生物体具有双向性的作用,在一定剂量范围内可表现出抗氧化、抗肿瘤、抗突变、抗骨质疏松,防治妇女更年期综合征和降低心血管疾病发生等有益作用,在较大剂量下可表现出内分泌干扰活性和其他毒性反应。
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