How do I know if I’m a candidate for an adjustable gastric band? Again, the primary starting point is to figure out your Body Mass Index, and once you have calculated your Body Mass Index, a person who would think about a band would be someone who has pretty good control over themselves and their behavior. So if someone perhaps who has lost a large amount of weight before, but just couldn’t hang on to that weight loss, that’s a person who really should think about an adjustable gastric band.