For so very many years I have discussed with women the ill-effects of taking hormones in on a regular basis. Doctors used to tell people there were no cardiovascular risks and that ERT (estrogen replacement therapies) actually improved bone density. I am here to tell you this information is not correct, and never ever was. You see not only does the estrogen in birth control and in ERT's make you twice as likely to break a hip but it will make it more likely that you will die from a heart attack and suffer from strokes and blood clots! You want proof? Read about the cycling of osteoclast and osteoblast cells responsible for building of the bones. You will see the waxing and waning of hormones a woman cycles through causes the bones to discard of old material and re-build with fresh, new material. Yes, you will read about the parathyroid and thyroids involvement, and you will see that E2 (estradiol) stops the discarding cells in the bones from getting rid of useless material. You then, as many will visualize what happens. Like stalagmites in a cave, this old, dead material builds up with no cells coming in to support the bone's density with fresh, new, live, strengthening material. The bone may appear to be more dense, however, it is fragile! This is also the mechanism of action of many osteoporosis medications - such as Boneva (I like Sally Fields too, but she would be ashamed if she really knew the facts - not her job though is it)?
There is a lot in the news right now about birth controls, Yaz (Yasmin) and Seasonique. The documented damage is in the news again. I looked it up on Snopes.com to get the real story. Take a look at what I found. http://www.snopes.com/medical/drugs/dishuk.asp