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补钙不仅仅是为了强壮骨骼 2011-12-13 07:50:46

        提到补钙,大多数人想到是为了强壮骨骼,防治骨质疏松。中山大学孙逸仙纪念医院临床营养科陈超刚副主任医师介绍,其实,缺钙不仅对骨骼不利,还可引发其他健康问题。

预防疲劳:在骨骼肌收缩过程中,钙结合蛋白起着重要的作用。钙缺乏则各种肌钙蛋白含量下降,骨骼肌的收缩功能减弱,人就会感到疲倦、乏力。所以,对于经常疲劳但又查不出什么器质性病变的人,可考虑是否由缺钙引起。 

提高降糖效果:糖尿病引起的代谢紊乱会使骨质流失、造成体内钙质不足,而钙在胰岛素分泌和细胞内传递信息过程中起着重要作用。所以,糖尿病人补充足够的钙,除了有助于防止骨钙丢失,还能提高机体胰岛素受体的敏感性,提高降糖效果。

降低血压:研究发现,缺钙是引起高血压的因素之一,而在饮食中增加钙的摄入量,可以降低高血压的发生率。因为钙能防止血管的紧张性收缩,有助于改善血管的弹性。尤其对于高血压患者,服药的同时适当补钙,提高治疗功效。

改善好动情况:钙有抑制神经细胞异常兴奋的作用,缺钙的儿童好动,情绪不稳定,思维易分散,补钙有助于改善儿童精神状态。 

减少肠癌患病率:哈佛大学医学院的研究人员分析了人们每日对富含钙质的食品摄入情况,结果发现,每日饮用250毫升以上牛奶的人,患结肠癌的几率要比几乎不喝牛奶的人少15%左右。这可能与钙质不仅可吸收和结合肠道中脂肪酸、胆汁酸等致癌物,将这两种物质结合成不易溶解的化合物并排出体外,还能影响细胞生化反应,调控细胞生长,从而起到预防肠道肿瘤的作用。

陈超刚表示,补钙应以食补为主,含钙高的食物有奶及奶制品、豆类、虾皮、海带、坚果、粮食、畜禽肉类等。同时一定要重视运动锻炼,并经常晒晒太阳,以促进钙的吸收利用。钙也不是多多益善,如过量的钙质有可能导致前列腺癌。(网络)

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