Can you tell me about vaginal atrophy?

I have just been diagnosed with osteopenia. What is this? I am about to begin post-breast cancer treatment with the aromatase inhibitor Arimidex, which I understand will increase my chance of bone loss. Any information would be appreciated.

What preventive tests should middle-aged women receive to prevent serious illness?

I had a partial hysterectomy four years ago due to fibroids. I was 48 years old and weighed 116 pounds. (I'm five-foot-one.) Now I weigh 137 pounds. I have not changed my diet or exercise routine. I still have my ovaries. Do you think it was just the hysterectomy that caused my weight gain? What can I do to lose weight?