It seems like you're referring to a condition commonly associated with female athletes, known as the "female athlete triad," which includes energy deficiency, menstrual dysfunction, and decreased bone density.
A suitable completion for your sentence could be:
"The best approach to preventing the female athlete triad is to provide information about the disorder to parents and those in sports who associate with young women, such as coaches and trainers."
If you meant a different condition, please let me know!