If a woman's fat ratio drops below (I think it's) 15%, she loses her peripheral estrogen, stops ovulating, and then her bones begin to demineralize just like a woman past menopause.
It's this loss of bone density in young women who are training hard (and losing critical amounts of fat) that leads the women to suffer shin splints and a whole lot of other bone and joint injury.
Refusal to take seriously that men and women are physically different, and that this difference can have real-world, life-and-death consequences, is going to get a lot of women killed.
You've come a long way, baby. Yeah.
There! I fixed it!