My weight is due to hormone imbalance from steroids. What can I expect from the sleeve surgery? (photo)

I am scheduled for my gastric sleeve in 3 weeks. I went from 115 to 205 after a injury that required large amounts of steroids with blood transfusions. It's been three years and I can't shake the weight even with diet and low impact excercise. I don't want to get my hopes up to high, can you tell me what's a realistic amount of weight I can expect to lose the first year? Thank you

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