Nutrients:铁过量,减少婴儿益生菌,导致炎症和腹泻

缺铁性贫血在撒哈拉以南的非洲国家的婴儿及儿童中十分常见;
家庭用铁营养强化补充食品利用微量营养元素粉末(MNP),在不改变婴儿及儿童饮食的情况下,通过确保铁元素的需求降低了缺铁性贫血的风险;
然而MNP提供的铁元素剂量太高,可能导致腹泻风险增加;
铁元素过量导致肠道内益生菌减少,破坏了益生菌形成的肠道屏障并诱发肠道炎症。
延伸阅读
Nutrients [IF:4.171]

Iron Fortification of Foods for Infants and Children in Low-Income Countries: Effects on the Gut Microbiome, Gut Inflammation, and Diarrhea

为低收入国家婴儿及儿童的食物铁营养强化:对肠道菌群、肠道炎症及腹泻的作用

2016-08-12, Review, 10.3390/nu8080494more

Abstract:
Iron deficiency anemia (IDA) is common among infants and children in Sub-Saharan Africa and is a leading contributor to the global burden of disease, as well as a hindrance to national development. In-home iron fortification of complementary foods using micronutrient powders (MNPs) effectively reduces the risk for IDA by ensuring that the iron needs of infants and young children are met without changing their traditional diet. However, the iron dose delivered by MNPs is high, and comparable on a mg iron per kg body weight to the supplemental doses (2 mg/kg) typically given to older children, which increases diarrhea risk. In controlled studies, iron-containing MNPs modestly increase risk for diarrhea in infants; in some cases, the diarrhea is severe and may require hospitalization. Recent in vitro and in vivo studies provide insights into the mechanism of this effect. Provision of iron fortificants to school-age children and iron-containing MNPs to weaning infants decreases the number of beneficial 'barrier' commensal gut bacteria (e.g., bifidobacteria), increases the enterobacteria to bifidobacteria ratio and abundances of opportunistic pathogens (e.g., pathogenic Escherichia coli), and induces gut inflammation. Thus, although iron-containing MNPs are highly effective in reducing IDA, they may increase gastrointestinal morbidity in infants, and safer formulations are needed.

All Authors:
Daniela Paganini,Mary A Uyoga,Michael B Zimmermann