Clin Nutrition: 口服乳酸可以减缓胃排空并抑制男性的食欲

2022-02-23 MedSci原创 MedSci原创

乳酸是由于运动过程中,体内葡萄糖的代谢过程中产生的中间产物。由于运动相对过度,超过了有氧运动的强度,而导致机体内产生的乳酸不能在短时间内进一步分解为水和二氧化碳。

      乳酸是机体中间代谢中的关键代谢物,可作为包括心脏和大脑在内的主要器官的替代能量来源。它是通过非氧化性葡萄糖代谢和主要在下胃肠道 (GI) 中通过营养物质的微生物发酵内源性产生的。除了作为能量来源的影响外,乳酸也是一种信号代谢物。因此,乳酸可能与许多受体相互作用,并可能影响胃肠道运动、食欲和肠道激素的分泌,如胰高血糖素样肽-1 (GLP-1) 和葡萄糖依赖性促胰岛素多肽 (GIP)。细胞因子和肽激素生长差异因子15 (GDF15) 与后脑中的 GDNF 家族受体α样 (GFRAL) 结合,并在动物研究中发现可以抑制食欲。我们假设口服乳酸对上消化道有直接影响。该研究的目的是探究口服乳酸是否会刺激 GDF15 分泌、肠道激素分泌、减慢胃排空率并抑制食欲。

 

       为了完成本项研究,研究人员在两个不同的场合对十名健康男性志愿者进行了相关试验:1) 在口服摄入D/L-乳酸钠后和 2) 在口服摄入等渗等体积 NaCl 和静脉注射等乳酸 D/L-乳酸钠后,通过问卷评估食欲,并在每个研究日结束时进行随意进餐测试。使用对乙酰氨基酚试验评估胃排空率,最后进行了相关性分析。

 

      研究结果显示口服和静脉注射乳酸后,生长差异因子 15(GDF15)的血浆浓度明显增加(p< 0.001),干预措施之间没有可检测到的统计学差异(p=0.15)。与静脉内给药相比,口服乳酸降低了酰化生长素释放肽(p = 0.02) 的血浆浓度,并提高了胰高血糖素样肽 1 (GLP-1, p = 0.045)、胰岛素 (p < 0.001) 和胰高血糖素 (p < 0.001)浓度。与静脉内给药相比,口服乳酸减缓了胃排空(p < 0.001),增加了“饱”的感觉(p = 0.008)并降低了“预期的未来食物摄入量”(p = 0.007)。

图:乳酸可以减缓胃排空

 

      本项研究证实口服乳酸对上消化道有直接影响,影响肠道激素分泌、蠕动和食欲感觉,这些不能仅通过体循环中的乳酸介导。这些数据表明富含乳酸的化合物可能有助于治疗代谢疾病。

 

 

原始出处:

Mette Glavind BülowPedersen. Et al. Oral lactate slows gastric emptying and suppresses appetite in young males. Clinical Nutrition.2022.

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    2022-10-03 贵阳
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    2022-02-24 ms1000001337797820

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