Frontiers in Psychology:垃圾食品让老鼠也暴饮暴食

2014-10-30 佚名 生物谷

饮食垃圾食品不仅会使大鼠变胖,而且还降低了它们对新型食品的“胃口”,这种对新型食品的胃口偏好通常驱使它们寻求均衡的饮食,发表在Frontiers in Psychology杂志上一项研究有助于解释过多食用垃圾食品可以改变人们的行为,削弱自我控制能力,导致暴饮暴食和肥胖。 研究人员组教年轻雄性大鼠,将两个不同的声音提示与一个特定的糖水味道--樱桃和葡萄关联起来。健康大鼠,提高了健康的饮食,会

饮食垃圾食品不仅会使大鼠变胖,而且还降低了它们对新型食品的“胃口”,这种对新型食品的胃口偏好通常驱使它们寻求均衡的饮食,发表在Frontiers in Psychology杂志上一项研究有助于解释过多食用垃圾食品可以改变人们的行为,削弱自我控制能力,导致暴饮暴食和肥胖。

研究人员组教年轻雄性大鼠,将两个不同的声音提示与一个特定的糖水味道--樱桃和葡萄关联起来。健康大鼠,提高了健康的饮食,会停止对它们最近溺爱味道相关线索的响应。这种与生俱来的机制,在动物中广泛存在,能防止暴饮暴食,促进健康、均衡的饮食。

但2周的饮食后,包括馅饼,饺子,饼干和蛋糕后,获得了150%更多的热量,大鼠的体重增长了10%,而他们的行为发生了巨大变化。

他们在他们的食物选择中变得冷漠,不再回避熟悉味道的线索。这表明他们已经失去了对新奇的天然偏好。在老鼠恢复到一个健康的饮食习惯后,这种变化甚至持续了一段时间。

研究人员认为,垃圾食物引起大鼠大脑的奖赏回路部分出现持久的变化,例如,眶额皮层,其是负责决策的大脑区域。他们说,这些结果可能对人们限制某些种类食物摄入量的能力有影响,因为大脑的奖赏回路在所有哺乳动物中是相似的。

关于这一发现的有趣的事情是,是否同样的事情发生在人类身上,吃垃圾食品可能会改变我们对与食物奖励相关信号的反应。这就像你刚刚有冰淇淋当午饭,但当你听到冰淇淋车来了的时候,你还是去吃更多的冰淇淋。

据世界卫生组织估计,全球成人人口的10%以上为肥胖,至少280万人每年死于超重或肥胖。超重和肥胖的主要危险因素为一些慢性疾病,包括糖尿病,心血管疾病和癌症。

原始出处

Reichelt AC1, Morris MJ2, Westbrook RF3.Cafeteria diet impairs expression of sensory-specific satiety and stimulus-outcome learning.Front Psychol. 2014 Aug 27

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    2015-06-08 ljjj1053

    好好学习学习

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    2015-03-24 anminleiryan
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