translation.en: The hypothalamus, the part of the brain that regulates body weight, there are more than a dozen chemical signals in the brain that tell your body to gain weight, more than another dozen that tell your body to lose it, and the system works like a thermostat, responding to signals from the body by adjusting hunger, activity and metabolism, to keep your weight stable as conditions change.
translation.zh: 大脑的一个部分叫下丘脑 它调节着你的体重 你的大脑有十多种化学信号 会告诉你的身体去增加体重 还有另外十多种信号会告诉你的身体去减重， 这系统的工作原理就像恒温器 对身体接收到的信号做出反应 通过调节饥饿感，活动，新陈代谢 根据条件的变化，维持你的体重