And because glucose fuels the neurons, a transitory low level in the brain may signal the stomach to get the hands to fill up the mouth, even though the energy actually spent has gone up just a hair.

因为葡萄糖是神经元活动的能量来源，所以大脑中的短暂的葡萄糖低浓度水平会向胃发出信号，让人赶快往嘴里塞食物，纵然能量其实只消耗了九牛一毛。