We tend to think of our bones like rocks, stable and unchanging, but our bones are continually being broken down and rebuilt just like our skin or muscle tissue. Before weight loss surgery, bones have become strong and dense to support excess weight. After surgery, bones tend to lose strength and density, because they are not supporting as much weight, nutrient intake decreases, and absorption may be hindered due to less stomach acid (bypass and sleeve) and less intestinal absorptive area (bypass).
