Hope you are well. I made the decision for my joints as well, though I had already lost 25lbs in 1 year prior to surgery and my BMI was 36 and had no other metabolic problems. But I had stopped a lot of things that I loved to do, like soccer, squash and running due to bad knees. On top of that seeing my mother, who now needs knee replacement and is too afraid to do it, I felt I needed it.