Donna,
I'm so sorry to hear about the outcome of your bone scan. Join the club. They're finding that a lot of it has to do with genetics, which is why some people can not exercise and never think about diet yet live to 110 with the bone density of a teenager, while others do everything right and are osteoporotic when they're 30.
But they have already made excellent advancements in medication--such as Fosamax and Evista--and I know they're working on other methods and medication.
It still sucks though. While the progress medicine has made is good, they also ignored bone density until the late 1970s. Also, most people don't realize how serious osteoporosis can get. Don't mean to sound like the grim reaper, but at least in the 1980s, about 40% of deaths in women over 75 were caused by the osteoporotic hip breaking first, then the woman falling, with the cause of death either being due to the fall or to the surgery.
But knowledge is power, and now that you know, you can take do what you can to keep the loss of bone density from increasing or even reverse the trend. You also have the Internet now, which wasn't around before. My gynecologist used to tell me that his patients would come into his office with studies from PubMed that he hadn't even seen yet. So some women are really taking the bull by the horns.
All the best to you Donna. I'm sure we're all thinking of you and hoping for the best. Hang in there--and jump up and down, too

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Rgirl