I just read an article on
www.ingentaconnect.com (an austrailian med article website) It said that a study they did on 118 patients showed that the gastric band is semipermeable and that they found a small reduction of saline solution in the band ring over time. The said that is why sometimes people have a problem with finding the right fill or retaining it. They recommend that you get your fill checked every 6 months. Just a little piece of info that I found informative.