I'm very interested in this discussion. I live in a northern clime (Upper Peninsula of Michigan) so the amount of sunlight I get throughout the year is affected by the winter months. I've been in the osteopenia range since my mid-40's despite years of weight bearing exercise including hiking, walking and weight-lifting. My mother had osteoporosis which is a big risk factor. My vitamin D level was tested and found to be very low (this was 8 years ago) so I went on megadoses of Vitamin D and have continued with calcium and Vitamin D supplements. I was diagnosed with osteporosis 8 years ago (in my hip) and finally agreed to go on Fosomax two years ago. My next DEXA scan will be in another year and my PCP and I will decide whether to discontinue the Fosomax (I'm hoping for the best).