"During athletic training, many people think amenorrhea, or the halting of your menstrual cycle, is normal. But it’s not. And according to registered dietitian Kate Patton, MEd, RD, CSSD, LD, it can indicate a serious problem with your diet."
"It is one part of the Female Athlete Triad"
"Female athletes with one risk factor are more likely to develop — or to already have — the other two."
https://health.clevelandclinic.org/is-it-normal-to-lose-your-period-because-of-exercise