I had a bone density scan a few years ago as I fit the profile for osteoporosis - female, fifty (56), fair, tall & lean. Though my results were good, during my most recent l visit with my Ob/Gyn, she suggested I have another one done within the next year as I am on Synthroid for Hypo-thyroidism. She told me the drug is calcium depleting. I try hard to maintain a diet rich in calcium perform a good deal of weight-bearing exercise through yoga and free weights.
During my visit, she asked me a number of questions regarding conditions common with 50+ women. Each time she asked if I was experiencing a particular symptom/condition, I was able to answer "no." Each time, she responded, "that's because you exercise." (Yay, bikes & weights!)