I have been trying to decide between sleeve or bypass for a while now. I don't have good bone density for my age and am premenopausal. I had extremely low vit D levels, and since I found out, have been taking vit D and calcium every day and my bone density hasn't deterorated in the last 18 months. I was worried about malabsorption with the bypass, but have been doing research on the internet, and was surprised to read that bone density can be affected by having the sleeve as well, though not as easily as with bypass- and that's even with taking all the correct vitamins and supplements. Something to do with hormones being affected with the removal of a lot of your stomach. I couldn't see anything on this forum about it. Was wondering if this was a concern for anyone when going ahead with the sleeve?