Both @primek and @Deanne make good points. Some people are too afraid of both chemo and AIs to try, which is potentially denying a considerable benefit. While deeply sympathetic to those having bad experiences, your own may be different. Being post menopausal before diagnosis, increasing exercise, and taking a small amount of supplements may all have assisted me in reducing/not having some of the most difficult side effects of an AI. I still have some side effects, but they are manageable for me, and like @primek, my bone density has improved in some areas and is certainly not getting any worse.
