A device useful for treatment of conditions relating to an eating disorder comprises: a) a duodenum obstructing component configured to partially obstruct the lumen of a duodenum in which deployed, preferably so as to reduce the rate of passage of materials through the duodenum; and b) an anchoring component configured to substantially maintain a position of the obstructing component inside a duodenum wherein deployed. The obstructing component does not block entry of food into the duodenum but rather causes a given volume of food that enters the duodenum to induce a greater degree of satiety and/or to induce a perception of satiety for a longer period of time and/or to induce a perception of satiety faster than otherwise.