I think you need to talk to your surgeon or fill person about this, and also trust them to know how much fill to add. An upper GI study/barium swallow x-ray should show whether your band is in the right position and the condition of your esophagus and stomach. It may just be that weight loss has caused the visceral fat surrounding your stomach to shrink enough to make your band feel looser, and a fill should take care of that.
