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<h1>研究表明适量补钙可预防老年痴呆</h1>
2008-3-16 15:02:31　已阅读:127次　

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<font color="#000000"><big><br><br>　　近年来的研究表明，人体长期缺钙，血浆中钙含量下降，甲状旁腺受缺钙的刺激，便会持续过量地分泌甲状旁腺激素，逐渐进入亢进状态，造成骨钙释放，进入血浆及软组织，发生钙迁徙，可使骨的总量减少，使老年人发生骨质疏松症，使细胞内钙离子浓度升高，造成血管平滑肌收缩，血压升高，损伤动脉壁，再加上钙迁徙，使钙容易在受损的动脉壁上沉积，形成动脉粥样硬化，使血压进一步升高。动脉的硬化和血压的升高，必然导致脑动脉供血不足，使脑组织缺血缺氧，从而促进大脑功能的衰退，使记忆力下降、思维能力减退，发生老年性痴呆。<b</big></font>
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<font color="#000000"><big><br>　　此外，缺钙导致的钙迁徙使神经系统中钙含量增加，也是老年痴呆发生的原因之一，中枢神经系统钙含量增加与老年痴呆时脑功能普遍降低有密切关系。<br><br>　　因此，专家认为，老年人正确补钙可预防痴呆。<br</big></font>

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