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JCEM:科学家解释肥胖者为何总觉“吃不饱”

2013-12-23 中国科学报 中国科学报

很多肥胖者总有“吃不饱”的感觉,哪怕饭后也抑制不住胃口。最新研究发现,其原因在于肥胖者体内控制食欲的胰高血糖素已经失效。【原文下载】 胰高血糖素是一种控制糖代谢的激素,可以调节血糖,功能与胰岛素相反。人体血糖低时,胰高血糖素分泌增多而胰岛素减少,血糖高时胰高血糖素分泌减少而胰岛素增多。此外,胰高血糖素还可以影响体内调节食物摄取的关键激素——胃饥饿素,通过调节人体的饥饿感来控制食欲。 德国柏林沙

很多肥胖者总有“吃不饱”的感觉,哪怕饭后也抑制不住胃口。最新研究发现,其原因在于肥胖者体内控制食欲的胰高血糖素已经失效。【原文下载

胰高血糖素是一种控制糖代谢的激素,可以调节血糖,功能与胰岛素相反。人体血糖低时,胰高血糖素分泌增多而胰岛素减少,血糖高时胰高血糖素分泌减少而胰岛素增多。此外,胰高血糖素还可以影响体内调节食物摄取的关键激素——胃饥饿素,通过调节人体的饥饿感来控制食欲。

德国柏林沙里泰大学医疗中心研究人员对11位肥胖者、13位Ⅰ型糖尿病患者和13位瘦人进行对比试验,随机给他们注射胰高血糖素或安慰剂,并随后测量他们的饱食感程度与胃饥饿素水平。

结果显示,肥胖者无论注射胰高血糖素还是安慰剂,饱食感程度几乎没有区别,表明他们的身体已对胰高血糖素不敏感。相比之下,体内不能正常生成胰岛素的Ⅰ型糖尿病患者和瘦人,在注射胰高血糖素后表示有明显的饱食感,甚至在24小时后还可以检测到该激素。

研究者说,肥胖者体内胰高血糖素调节食欲失效的原因还需进一步研究,不过该发现为肥胖症和糖尿病的治疗提供了新思路。报告发表在美国《临床内分泌学与新陈代谢杂志》上。

原文出处

Arafat AM, Weickert MO, Adamidou A, Otto B, Perschel FH, Spranger J, Möhlig M, Pfeiffer AF.The impact of insulin-independent, glucagon-induced suppression of total ghrelin on satiety in obesity and type 1 diabetes mellitus.J Clin Endocrinol Metab. 2013 Oct;【原文下载

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    2014-11-10 chg121

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