Cell METAB: 甜味剂+碳水化合物更伤身!

2020-03-05 王芳 生物探索

随着低热量甜味剂在食品、饮料、药物等方面的广泛应用,关于它在健康方面影响的争议也越来越大。一些科学家认为,长期食用甜味剂将对大脑及新陈代谢产生负面影响。当地时间3月3日,《Cell Metabolism》发布的一份新研究报告提出,或许有害的不是甜味剂,而是甜味剂与碳水化合物的组合。

随着低热量甜味剂在食品、饮料、药物等方面的广泛应用,关于它在健康方面影响的争议也越来越大。一些科学家认为,长期食用甜味剂将对大脑及新陈代谢产生负面影响。当地时间3月3日,《Cell Metabolism》发布的一份新研究报告提出,或许有害的不是甜味剂,而是甜味剂与碳水化合物的组合。

这份报告由耶鲁大学医学院和法国国家科学研究中心的研究人员合作完成。在实验中,研究人员招募了45位20-45岁、很少食用甜味剂产品的志愿者,让他们随机饮用由三氯蔗糖、蔗糖、麦芽糊精(一种不甜的碳水化合物)调制的等甜饮料,并通过口服葡萄糖耐量测试(OGTT)(或单次抽血)、感觉测试和神经影像学检查观察了志愿者饮用前后的变化。

检测结果表明,与单独饮用三氯蔗糖或蔗糖饮料相比,饮用三氯蔗糖和麦芽糊精组合(Combo)的志愿者在第一阶段(0-30min)胰岛素的反应更大,第二阶段中(0-120min)三氯蔗糖组(LCS组)和Combo组的胰岛素变化也不同。值得注意的是,这样的变化似乎并不是由麦芽糊精导致的,因为在对照组中,单独饮用麦芽糊精饮料的志愿者在7天时间里,葡萄糖代谢和胰岛素水平均无明显变化。


胰岛素敏感性变化

此前已有小鼠研究表明,将甜味剂添加至0.4- 0.6 kcal/g的碳水化合物或含有碳水化合物的酸奶中,小鼠的新陈代谢受到l了损害,当时研究者认为这是由甜味剂造成的。但是奇怪的是,当人们单独食用甜味剂或含有甜味剂的胶囊时,新陈代谢却未受影响。现在,这项新研究指出了其中的症结:可能是甜味剂与碳水化合物的组合有问题。

至于导致这一结果的原理,研究人员认为,可能是人们同时食用甜味剂与碳水化合物时,肠道给大脑传递了错误的信息。该报告的第一作者Dana Small说,“肠道对三氯蔗糖和麦芽糊精敏感,并且向大脑发送两倍于实际热量的信号,日积月累,这些错误的信息可能会通过改变大脑和身体对甜味的反应而影响健康。”

尽管这项研究存在着一些不足,比如样本量过少、与志愿者接触时间过短、仅检测了一种甜味剂等,但是它提出了一种新的观点,并提醒我们,虽然甜味剂没那么糟,但是从健康的角度出发,甜味剂最好不要和碳水化合物一起食用,尤其是在甜味剂被广泛用来制作代糖食品的情况下,更应慎重选择。

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    2020-11-13 维他命
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    2020-10-13 一闲
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    2020-08-02 guojianrong
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    2020-03-07 yuanming9

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