Exercise and too few calories both affect the menstrual cycle because they have a similar effect on the body: an energy deficiency.

运动跟太少热量 两者兼影响月经周期 因为他们对身体都有相似的影响能量不足。

An energy deficiency puts your body in preservation mode: the body focuses on conserving fuel for the most important functions, and reproduction doesn’t make the cut.

能量不足会让你身体进入保存状态 身体专注於为比较重要的功能保存能量而繁殖并不包含在内。