书接上回，今天结束第四章，从这里开始就是核心内容，为什么会饿，为什么要吃、哪些激素影响饥饿感/满足感、节食造成的激素水平异常 FOUR: Why We Eat: How Our Appetite (and Satiety) Works Once they have learned about the mechanisms, they can work to produce a drug to mimic the effect of bariatric surgery on appetite – and…