孕期每天服用铁元素能增加婴儿出生体重

海量资料下载 免费学习 www.englishvip.com/xinlw.htm （申请网址） Taking iron daily during pregnancy is associated with a significant increase in birth weight and a reduction in risk of low birth weight, finds a new study. The effects were seen for iron doses up to 66 mg per day. The World Health Organization currently recommends a dose of 60 mg per day for pregnant women.   Iron deficiency is the most widespread nutritional deficiency in the world. It is the most common cause of anemia（贫血） during pregnancy, especially in low and middle income countries, affecting an estimated 32 million pregnant women globally in 2011.   Studies suggest an association between prenatal anemia and risk of premature (preterm) birth, but evidence on other birth outcomes is inconsistent. The effect of prenatal iron use on adverse birth outcomes is also unclear.   So researchers in the UK and US analysed the results of over 90 studies (a mix of randomised trials and cohort studies) of prenatal iron use and prenatal anemia, involving nearly two million women.   Iron use increased a mother's average haemoglobin（血红蛋白） levels compared with controls and significantly reduced the risk of anemia.   There was no reduction in risk of preterm birth as a result of iron use. However analysis of cohort studies showed a significantly higher risk of low birth weight and preterm birth with anemia in the first or second trimester of pregnancy.   Further analysis indicated that for every 10 mg increase in iron dose per day (up to 66 mg per day), risk of maternal anemia was 12% lower, birth weight increased by 15 g and risk of low birth weight decreased by 3%.   No differences were seen in duration of iron use after adjusting for dose.   "Our findings suggest that use of iron in women during pregnancy may be used as a preventive strategy to improve maternal haematological status and birth weight," say the authors. They call for "rigorous evaluation of the effectiveness of existing antenatal care programmes in high burden countries to identify gaps in policy and programme implementation."   And they say future research should explore "feasible strategies of iron delivery" as well as "evaluation of the effectiveness of other strategies, such as fortification and dietary diversification." 在怀孕期间每天服用铁剂与出生体重和减少低出生体重的风险显着增加相关，一项新的研究发现。被视为影响铁的剂量高达每天66毫克。世界卫生组织目前建议孕妇每天60毫克的剂量。   缺铁是最普遍的营养缺乏症在世界上。贫血（贫血）是最常见的原因，在怀孕期间，尤其是在低收入和中等收入国家，在2011年全球估计有32万孕妇的影响。   研究明早产（早产儿）出生产前贫血和风险之间的关联，但对其他避孕结果是不一致的证据。不良的分娩结局的影响的产前铁上使用的是目前还不清楚。   因此，在英国和美国的研究人员分析了超过90项研究（混合的随机临床试验和队列研究）产前铁使用和产前贫血，涉及近200万妇女的结果。   铁的使用增加了母亲的平均血红蛋白（血红蛋白）水平与对照组相比，显着减少贫血的风险。   由于铁使用并无减少早产的风险。然而，队列研究分析显示低出生体重和早产，贫血，妊娠晚期的第一或第二的一个显着更高的风险。   进一步分析表明，每增加10毫克铁每天剂量（每天​​高达66毫克），产妇贫血的风险低12％，出生体重增长15克，低出生体重的风险下降了3％。   铁使用的持续时间调整剂量后未见差异。   “我们的研究结果表明，妇女在怀孕期间使用铁可能被用来作为一种预防性的策略，以改善产妇的血液状态和出生体重，”作者说。他们呼吁为“严格评估现有的产前保健计划在高负担国家政策和计划的实施中找出差距的有效性。”   他们说，未来的研究应该探讨铁交付的“可行的策略”，以及“其他策略，如强化和饮食多样化的有效性评价。” “成千上万人疯狂下载。。。。。。 更多价值连城的绝密英语学习资料， 洛基内部秘密英语，技巧，策略 请在 网上 申请报名” 洛基国际英语 竭诚为您服务