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.
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