In reply to @chaiyosef regarding challenges with vitamin D and cholesterol and my thought that OP may be related - the endocrinologist reviewed tests I've had done and common diseases which can cause severe OP were not found. The high cholesterol runs in my family and Keith McCormick, DC and author of Great Bones, said I must get my LDL down to help with bone building. I have talked about the cholesterol elsewhere but I'm trying to eat less fat and primarily healthy fat. I was on Prozac in my thirties for about a year and that can contribute to OP but is likely not the entire story. Cortisol in the body may have contributed to my OP. I aspire to bring kindness to myself when I feel anxiety and stress. I am certainly interested in understanding underlying issues contributing to OP and poor absorption of vitamin D and I wish I knew more.