Bones remodel in response to mechanical loading — more body weight means more stress on bones, which means denser bones. When you lose significant weight, that mechanical stimulus decreases, and some bone density loss can follow. This is especially relevant for women over 40 and anyone losing more than 10% of body weight.
GLP-1 receptors exist in bone tissue, and some research suggests direct bone-protective effects. The clinical picture is mixed — the fat loss and reduced mechanical loading can decrease density, while improved blood sugar control and reduced inflammation may help. Overall, the net effect appears neutral to slightly positive for most people when protein and calcium are adequate.
If you're over 50, losing more than 15% of body weight, or have any of the risk factors above, ask your doctor about a DEXA scan. This measures bone mineral density and establishes a baseline you can track over time.
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