I'm under the impression that estrogen is only related to bone density in the case of inactive women who do not do the OTHER things necessary for bone density, i.e. - eat decently and engage in weight bearing exercise.
After all, guys don't have periods, don't have much estrogen, and they don't get dowager's humps or as many broken hips, do they?
As I understand it, estrogen is only one of the factors related to bone density, and that the bones themselves react directly to stress by increasing their density when pressure is applied to them on a regular basis. My opinion, which has been confirmed to me by doctors, is that diet and weight-bearing exercise are more important to maintaining bone density than estrogen is, and in general, more healthful and helpful throughout a woman's life. Since high estrogen levels are only programmed to happen through a limit number of years for us, it doesn't make sense to rely on it completely.
Something tells me Spatt eats just fine and lifts PLENTY of weight to do the job.
Fawn