BBW WANTS TO LOSE WEIGHT

Ok so hi everyone I'm new on here. I'm 380lbs and now I'm a diet to lose weight. Let me start from the beginning. When I was 14yrs old I was 145lbs than I had my son and I went up to 175lbs by the time I was 16yrs old. So after every child I had I gained weight so now I'm 43yrs old ( by the way I have 7 kids) and I have back problems and my ankles swell up when I stand or walk to much. So I've decided to have the Sleeve gastric surgery. I guess what I. trying say to all you women that are under my weight to please please exercise walk drink water eat healthy now and if it doesn't come off think about the surgery before it's too late