translation.en: When food was scarce, our ancestors' survival depended on conserving energy, and regaining the weight when food was available would have protected them against the next shortage.
translation.zh: 当食物匮乏时，我们的祖先 依靠身体中储存的能量生存 当食物充足时增加体重 将会确保他们在下一次 食物短缺的情况下能够生存下来