A device for fixating a gastrointestinal device may include a band of material that may be wrapped around the gastrointestinal tract, for example, by wrapping the band around the outside of the stomach or wrapping the band in such a way that it is integrated into and/or with the stomach tissue. In this illustrative embodiment, the band restricts the stomach such that the stomach lumen is constricted and/or the stomach is restricted from expanding beyond what the band will allow.