"“Female athletes who are most susceptible to restricting calorie intake are those who are involved in excessive exercise, play sports that require weight checks or are involved in sports that benefit from a leaner body composition"
"“Many women are in denial about developing exercised-induced anorexia from disordered eating. But missing a period is a sign that they are not eating enough and need further evaluation.”
https://health.clevelandclinic.org/is-it-normal-to-lose-your-period-because-of-exercise