手机APP下载

            您现在的位置: 首页 > 在线广播 > 科学美国人 > 科学美国人健康系列 > 正文

            科学美国人60秒:胃饥饿素让你暴饮暴食

            来源:LEG棋牌 编辑:aimee   VIP免费外教试听课 |  可可官方微信:ikekenet
             下载MP3到电脑  批量下载MP3和LRC到手机
            加载中..
            VLx0b&lN*ix

            ALox3Cl=if_

            This is Scientific American — 60-Second Science. I'm Karen Hopkin.
            'Tis the season...for overeating! But it's not just your lack of willpower or the omnipresent holiday treats. No, you can lay some of the blame on ghrelin. Because a new study shows that ghrelin, the hormone that makes you hungry, also makes food...and food smells...irresistibly appealing. The finding appears in the journal Cell Reports.
            Ghrelin is produced in the stomach, and its levels rise before your habitual mealtimes and after you haven't eaten for an extended period. So the hormone reminds you to put something in your belly. Injecting rats with ghrelin encourages them to eat...and people who receive a dose of ghrelin grab extra helpings from the buffet.
            But how does the hormone induce overindulgence? To find out, researchers at McGill University trained volunteers to associate random images with the smell of food. For example, every time they saw a tree, they might get a whiff of freshly baked bread. At the same time, some of the subjects received ghrelin; others got only saline.

            x|4GNcM(ANHR,

            饥饿.jpg
            The volunteers were then ushered into an fMRI machine, where the researchers watched their brains to see which parts got turned on by different images.
            Seems that in subjects under the influence of ghrelin, the brain region involved in pleasure and reward lit up only when volunteers viewed the images they associated with food aromas. Their brain pleasure centers were disinterested in images that had not been paired with food smells.
            Also, when participants were then asked to rate the pleasantness of the images, the ones who'd been exposed to ghrelin gave higher grades to the food-associated pictures than did folks who got no ghrelin.
            So when visions of sugarplums...or the smell of apple pie...get your stomach growlin'...you can thank—or blame—your ghrelin. As you reach for a fork.
            Thanks for listening for Scientific American — 60-Second Science. I'm Karen Hopkin.

            JeQa-u9HJQui

            w%%pdB(&St,Z%n_l1A

            28tA,h[udyfB^65SMSV,.X,cmb(h@FncVYJ^^hfsLt7S

            重点单词   查看全部解释    
            appetite ['æpitait]

            想一想再看

            n. 嗜好,食欲,欲望

            联想记忆
            extended [iks'tendid]

            想一想再看

            adj. 延续的,广大的,扩大范围的 动词extend的

             
            habitual [hə'bitjuəl]

            想一想再看

            adj. 惯常的,习惯的

            联想记忆
            dose [dəus]

            想一想再看

            n. 剂量,一剂,一服
            vt. 给 ... 服

             
            blame [bleim]

            想一想再看

            n. 过失,责备
            vt. 把 ... 归咎于,

            联想记忆
            overwhelming ['əuvə'welmiŋ]

            想一想再看

            adj. 势不可挡的,压倒的

             
            cell [sel]

            想一想再看

            n. 细胞,电池,小组,小房间,单人牢房,(蜂房的)巢室

             
            random ['rændəm]

            想一想再看

            adj. 随机的,随意的,任意的
            adv. 随

             
            associate [ə'səuʃieit]

            想一想再看

            n. 同伴,伙伴,合伙人
            n. 准学士学位获得

            联想记忆
            hormone ['hɔ:məun]

            想一想再看

            n. 荷尔蒙,激素

            联想记忆
            

            关键字: 饥饿 健康 科学美国人

            发布评论我来说2句

              英语学习推荐

              • 英语听写训练
                听写强化训练系统有听写比对,按句停顿,中文翻译、听写错词提示等特色功能.
              • LEG棋牌微信:ikekenet
                关注LEG棋牌官方微信,每天将会向大家推送短小精悍的英语学习资料..

              科学美国人60秒

              LEG棋牌官方微信(微信号:ikekenet)

              每天向大家推送短小精悍的英语学习资料.

              添加方式1.扫描上方可可官方微信二维码。
              添加方式2.搜索微信号ikekenet添加即可。

                        LEG棋牌,LEG棋牌二八杠,棋牌28杠LEG棋牌,LEG棋牌二八杠,棋牌28杠