A bariatric device and method of causing at least partial satiety includes a body having a wall defining a lumen. The wall is configured to generally conform to the shape and size of i) the abdominal portion of the esophagus and/or ii) the proximal cardiac portion of the stomach. The wall is adapted to exert a force on the i) abdominal portion of the esophagus and/or ii) the proximal cardiac portion of the stomach thereby influencing a neurohormonal feedback mechanism to cause at least partial satiety by augmenting fullness caused by food and simulating fullness in the absence of food. A fixation system is included to resist distal migration of the body. The fixation system includes at least a portion of the wall having a tissue ingrowth characteristic to promote ingrowth of tissue in the wall.
