Bone Health After Bariatric Surgery in Patients With Type 2 Diabetes

This study is looking at how bariatric (weight-loss) surgery affects bone health in people with type 2 diabetes, to understand whether the surgery causes bone loss and what factors may increase that risk. **You may be eligible if...** - You are between 18 and 60 years old - You have a BMI of 35 or higher and are awaiting bariatric surgery - You have been diagnosed with type 2 diabetes, OR you do not have diabetes - A healthy-weight control group (BMI 25–29.9, no diabetes) is also enrolling **You may NOT be eligible if...** - You have type 1 diabetes - You have a condition affecting bone health (e.g., uncontrolled thyroid disease, metabolic bone disease) or take medications that affect bones (e.g., steroids, anti-seizure drugs, osteoporosis medications) - Your BMI is above 60 - You are pregnant, planning to become pregnant, or not using contraception during the study - You have had previous stomach or intestinal surgery, including prior bariatric surgery - You have active cancer or another serious chronic illness - You have a metal implant that would interfere with the imaging tests Talk to your doctor to see if this trial is right for you.