Nature:还是天然食物好!食品添加剂诱导炎症和代谢综合征

2015-02-28 佚名 生物谷

乳化剂(Emulsifiers)作为常用的食品添加剂,被用于加工食品以帮助保存食物质地,延长保质期。近日在Nature杂志在线发表的一篇最新报道肯定了我们对于食品添加剂的担心。Georgia State University生物医学研究所的研究人员发现乳化剂可改变肠道菌群的组成和位置,以诱导肠道炎症,促进炎症性肠疾病和代谢综合征。 炎性肠病(IBD)包括克罗恩病和溃疡性结肠炎,影响了数百万人

乳化剂(Emulsifiers)作为常用的食品添加剂,被用于加工食品以帮助保存食物质地,延长保质期。近日在Nature杂志在线发表的一篇最新报道肯定了我们对于食品添加剂的担心。Georgia State University生物医学研究所的研究人员发现乳化剂可改变肠道菌群的组成和位置,以诱导肠道炎症,促进炎症性肠疾病和代谢综合征。

炎性肠病(IBD)包括克罗恩病和溃疡性结肠炎,影响了数百万人的健康。代谢综合征是一组非常常见的与肥胖相关的疾病,可导致2型糖尿病,心血管和或肝脏疾病。IBD和代谢综合征的发病率自20世纪中期开始有了增加。“肠道菌群”是指100万亿个栖息在不同肠道位置细菌。IBD和代谢综合征中,肠道菌群通常都被扰乱。而研究人员调查发现食用乳化剂可能部分导致这种菌群紊乱,使得炎性疾病和代谢综合征的发生率增加。

研究人员用两种非常常用的乳化剂混入食物中喂养小鼠,包括聚山梨醇酯80(polysorbate 80)和羧甲基纤维素(carboxymethylcellulsose)。在乳化剂被广泛消化后,他们观察到,肠道菌群的组成发生了变化,这种变化更加的促炎症。改变的菌群有更强的消化和渗透肠道致密粘液层的能力,并且导致了细菌表达更多鞭毛和脂多糖,这可以激活免疫系统,激活促炎基因的表达。

在免疫系统已有异常的小鼠中,肠道菌群这些变化引发慢性结肠炎。与此相反,在正常的免疫系统小鼠中,菌群的变化主要诱导轻度肠道炎症和代谢综合症,其特征在于,更多的食物消耗,肥胖,高血糖和胰岛素抵抗。研究人员又检测了乳化剂激活的菌群对无菌小鼠的作用。乳化剂喂养过的小鼠的肠道菌群移植到到无菌小鼠后,引起了轻度炎症和代谢综合征。这已经足够表明乳化剂食用导致的菌群变化带来的影响。

该科研小组目前正在测试更多的乳化剂,调查乳化剂如何影响人类。如果在人体有类似的结果,这将表明这类食品添加剂在肥胖的盛行,各种慢性肠道炎症相关的疾病中确实扮演一定的角色。

生物谷授权转载

原始出处:

Benoit Chassaing,Omry Koren,Julia K. Goodrich,Angela C. Poole,Shanthi Srinivasan, Ruth E. Ley& Andrew T. Gewirtz.Dietary emulsifiers impact the mouse gut microbiota promoting colitis and metabolic syndrome.Nature (2015) doi:10.1038/nature14232


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    2015-11-25 liye789132251
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    2015-03-02 sky0909

    0

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    2015-03-02 yhy100201
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