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优生 饮食先把关
http://eat.csonline.com.cn  2007年04月09日10时59分   星辰美食网

 

  过去,对于不孕不育或胎儿发育不良,人们首先考虑的多是遗传、环境,或其他一些病理性因素,现在,由食品安全引起的生育问题越来越多地受到关注。食品安全问题成了一个不容忽视的事实。

  因此,从计划妊娠开始,夫妻双方就应彻底戒除烟酒等不良嗜好,远离浓茶、咖啡、可乐,以及色素重或脂肪含量高的食物和饮料,为优生做好充分准备。孕妇应尽量多食天然食品,如蔬菜、水果等,进食前,应彻底清洗干净;多吃酸性和富含钙、镁的食物,如奶制品、牛肉、鸡蛋、牛奶;多吃含钾、钠多的偏碱性食物,如花生、核桃、杏仁、五谷杂粮、根茎类粮食(如白薯、土豆、水果、栗子等)。

  妊娠早期(孕0~12周) 孕早期,孕妇容易发生恶心、呕吐、食欲不振、厌食油腻、疲倦等早孕反应,影响正常的进食,并妨碍营养物质的消化和吸收。因此,此期的饮食原则为:富于营养,易于消化,少食多餐。孕妇可选择自己喜欢的开胃健脾的食物,以增加食欲,不宜吃油腻、油炸、辛辣等不易消化和刺激性强的食物,以防消化不良或便秘,造成先兆流产。

  妊娠中期(孕13~27周) 此期,胎儿生长发育迅速,对各种营养素的需求大增。因此,孕中期的饮食原则是:全面营养,兼顾其他,补充热量,食品多样化。主食,如大米、面粉是补充热量的主要来源,同时,要注意摄入营养价值高、富含蛋白质的食物,如鱼、肉、蛋类、奶类、豆制品和富含纤维素、维生素的蔬菜水果等,适当补充钙片和鱼肝油。并适当限制盐的摄入,以防止妊娠高血压综合征。

  妊娠后期(孕28周至分娩) 此期胎儿生长最快,且日趋成熟,孕妇对各种营养物质的需求量更大。因此,该期的饮食原则是:以高蛋白为主,营养均衡,品种多样,补充矿物质和维生素类。在妊娠的最后两个月,胎儿对铁质的需求量相对较多,此时,若孕妇进食较少,则可出现贫血现象。因此,要多吃富含铁的食物如肝、肾、红枣、桂圆、桃干等。妊娠后期,往往出现便秘,孕妇除了多吃油菜、芹菜等含纤维多的蔬菜外,还要多吃些生津清热的水果、蔬菜,如苹果、葡萄、西红柿等。

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