Just watched a 2 hour interview of Dr. Hill on this book. I am ordering copies for each of my adult children and am encouraging parents of younger children to become better informed. Among the shocking (to me anyway) revelations was how women on the pill lack a cortisol response due to the reported lack of specificity of the artificial progesterone (progestin) in birth control pills. (One must wonder about the implications of THAT on women in a combat environment.)
The implications of leveling out a young teen woman's normal hormonal cycle on her brain development (which reportedly continues through 19 years old) needs much closer research.
Kudos, Dr. Hill.