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想减点体重?那你最好别喝咖啡。美国康奈尔大学一项最新研究显示,咖啡因会激发人对甜食的渴望。研究人员招募107名志愿者,把他们随机分成两组,让第一组喝无因咖啡外加200毫克咖啡因补剂,让另一组喝无因咖啡外加能得到像第一组一样苦味口感的添加剂,但这种添加剂不会影响咖啡的甜、酸、咸等其他味觉。两组志愿者喝的咖啡都加了糖。接下来,研究人员让他们接受味觉测试。结果,与“苦味添加剂组”相比,“咖啡因补剂组”感觉咖啡不那么甜。
研究人员在最新一期美国《食品科学杂志》双月刊上发表报告说,咖啡因会减弱味蕾对甜味的感知,让食物和饮料吃起来不那么甜,进而让人吃得摄入更多糖分。
研究人员还发现,无论志愿者喝下的饮料中含不含咖啡因,他们的敏锐程度没有明显差别。研究人员说,这其实是咖啡的安慰剂效应。在这当中发挥关键作用的是喝下咖啡的动作本身,它会让人联想到喝了咖啡就能变得更敏锐。(乔颖)【新华社微特稿】
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