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零糖食品会减肥?美研究:或致人体代谢活动减弱

2017-08-14 17:06:47   中国经济网

【环球网综合报道】为降低卡路里摄入量,保持好身材,不少消费者会选择号称零卡路里添加的无糖饮料或减肥食品。韩联社8月11日援引英国《每日电讯报》报道称,近日有研究表明,这些食品中添加的人工甜味剂会使大脑认知产生错觉,造成人体代谢活动减弱。

据报道,美国耶鲁大学教授的一项研究结果表明,若食物中的糖分与卡路里含量不平衡,随着代谢活动逐渐减弱,大脑会释放错误信号,从而中断能量的燃烧。

自然规律表明,糖分是能量的信号,糖分越高,卡路里的含量也会越高。因此人类的大脑也逐渐向这一认知方向进化。

该教授表示,当糖分与卡路里含量不平衡时,会引起大脑认知混乱,会使大脑误以为需要燃烧的卡路里含量减少,从而发出错误信号,中断人体代谢活动。他还表示,有些人认为,如果卡路里含量高,大脑反应就会趋于活跃,人体代谢活动也会随之增加。然而这一观点是错误的。实际上,大脑中激活代谢活动的信号大部分是由糖分发出的,而不是我们通常认为的卡路里。

为证明其研究结果的准确性,该教授的研究团队对15名研究对象进行了比较实验。通过跟踪拍摄他们的大脑图像,比较他们摄取无糖饮料与普通饮料时大脑活动的差异,观察他们体内能量的燃烧情况。

实验结果表明,当摄入糖分与卡路里含量不平衡时,人体无法正常进行代谢活动。此外,大脑的补偿回路也无法正常接收卡路里燃烧殆尽的信号。

英国卡地夫大学心理系教授表示,糖分与卡路里的不平衡会阻碍人体正常代谢,从而对人体健康造成危害。在这种情况下,多余的卡路里最终是会被消耗殆尽,还是会被人体储存起来,最终造成体重的增加,这一切还是未知数。(实习编译:刘睿滢 审稿:李婷婷)

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