为什么你明明不饿，却总想吃东西？科学解释来了！
<p><span word="Have">Have</span> <span word="you">you</span> <span word="ever">ever</span> <span word="wondered">wondered</span> <span word="why">why</span> <span word="some">some</span> <span word="days">days</span> <span word="all">all</span> <span word="you">you</span> <span word="want">want</span> <span word="to">to</span> <span word="do">do</span> <span word="is">is</span> <span word="snack">snack</span>?</p><p>不知道你有没有想过这个问题：为什么有时候你会不停地想吃东西？</p><p><span word="Under">Under</span> <span word="normal">normal</span> <span word="circumstances">circumstances</span>, <span word="we">we</span> <span word="feel">feel</span> <span word="hungry">hungry</span> <span word="when">when</span> <span word="we">we</span> <span word="have">have</span> <span word="burnt">burnt</span> <span word="up">up</span> <span word="the">the</span> <span word="food">food</span> <span word="we">we</span> <span word="have">have</span> <span word="eaten">eaten</span> <span word="as">as</span> <span word="energy">energy</span> <span word="and">and</span> <span word="our">our</span> <span word="blood">blood</span> <span word="sugar">sugar</span> <span word="and">and</span> <span word="insulin">insulin</span> <span word="levels">levels</span> <span word="begin">begin</span> <span word="to">to</span> <span word="drop">drop</span>. <span word="Ghrelin">Ghrelin</span>, <span word="a">a</span> <span word="hormone">hormone</span> <span word="connected">connected</span> <span word="to">to</span> <span word="appetite">appetite</span>, <span word="then">then</span> <span word="communicates">communicates</span> <span word="this">this</span> <span word="to">to</span> <span word="the">the</span> <span word="brain">brain</span>, <span word="which">which</span> <span word="is">is</span> <span word="how">how</span> <span word="we">we</span> <span word="feel">feel</span> <span word="the">the</span> <span word="need">need</span> <span word="to">to</span> <span word="eat">eat</span>.</p><p>在正常情况下，当身体把食物转为能量消耗掉之后，我们的血糖和胰岛素水平也开始降低，这时我们就会感到饥饿。然后，饥饿激素将这个信息传达给大脑。这样我们就会感觉到需要吃东西了。</p>
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