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In neuroscience, food is something we call a "natural reward". In order for us to survive as a species, things like eating must be pleasurable to the brain so that these behaviours are reinforced and repeated. 在神经科学中，我们称食物为“自然奖励”。为了让我们作为一个物种生存下来，像吃饭这样的事情必须让大脑愉悦，这样这些行为才能得到强化和重复。 Not all foods are equally rewarding, of course. Most of us prefer sweets over sour and bitter foods because, evolutionarily, our mesolimbic pathway reinforces that sweet things provide a healthy source of carbohydrates for our bodies. 当然，并非所有的食物都有同样的回报。我们大多数人喜欢甜食而不是酸的和苦的食物，因为从进化上讲，我们的中边缘通路不断加固甜食为我们的身体提供健康碳水化合物。 Anyone who knows me also knows that I have a huge sweet tooth. My friend and fellow graduate student Andrew is equally afflicted, and living in Hershey, Pennsylvania – the "Chocolate Capital of the World" – doesn't help either of us. 认识我的人都知道我超爱吃甜食。我的研究生朋友安德鲁也深受其苦，住在“巧克力世界之都”宾夕法尼亚州的好时市也没帮上我俩什么。 But Andrew is braver than I am. Last year, he gave up sweets for Lent. 但安德鲁比我有魄力。去年，他为了四旬斋戒了糖果。 | 
