it's very unusual for "normal" weight loss patients (that is, those of us who aren't the size of the folks on "My 600 lb Life") to lose that much weight (the 30 or 40 lbs you mentioned) the first month. I have been involved nationally - both on forums and at conferences - with WLS for years, and I've never known anyone to lose that kind of weight (maybe 30 lbs - but even those folks are outliers. Forty pounds? Never). Most of us lose somewhere in the 15-25 lb range that first month, so you are right where you need to be. I lost 17 lbs my first month, and I started out at well over 300 lbs. I went on to lose 235 lbs (have gained some of it back, as most people do, but I'm still over 200 lbs lighter at nine years post surgery). Your loss is absolutely normal.