Wow! You look amazing! I don't think it's safe to lose weight that fast but I could be wrong. It's also not healthy to be overweight so I would take that into consideration. It all depends on what you are doing to lose that kind of weight. Also, you mean in a month right? Not 10-20 lbs a week? In a week it would seem extremely...well....extreme. I hope you're feeling good and great job on the loss! YOu look really great!
