I also had to gain weight to meet the BMI requirement, but you have some time and there are some tricks. First of all your BMI is based on your weight and height. Generally you will have to take off your shoes but be careful when you get measured. Most people straighted themselves up to be the tallest they can, don't do that because even just half and inch can make a difference. Wear jeans instead of shorts b/c they are heavier. Wear a shirt that goes over your pockets so you keys, cell phone, or anything else in your pockets are not noticeable. Just before your appointment eat a meal and drink as much as you can. I even continued to drink from the doctor's Water fountain as I sat in the waiting room.
I know eating up sounds strange and many will discourage it and I would too if a person has to gain 10 plus pounds but when you are talking only a few pounds, what's the big deal. In the past every time I diet I eventually gain it all back plus some more. When I'm on a diet I never fill full. I hate dealing with always feeling hungry. The lap band will help me fill full sooner and after only a small amount of food. So gaining a few pounds so my insurance will pay for it was completely worth it, plus I saved over 16,000. My wallet is also glad. And now after I enjoyed all my favorite foods I'm prepared to start the two week liquid diet. In a strange way I feel like I had the opportunity to say good-bye to my old life style.
Plus, remember the doctor wants to give you the surgery, he/she wants to help you. It is the insurance companies that have created these BMI requirements.