My bm1 was 41 on day of my surgery but as long as u r losing,or staying the same weight bm1 dint really come into it xx I was scared of my previous. Op diet more than I was of the actual surgery but I kept it simple and easy and those 2 weeks flew by I just had chicken or white fish with either green salad and toms or spring greens carrots and green beans and obviously my fruit and water but that's what made it easier for me x I'm here if ever u have a question or any help I can advise u on xx