Methods and devices for treating obesity. Pressure is applied to gastric walls in at least one segment of a stomach such that the pressure distends the gastric walls and induces satiety. A hollow capsule can be used to distend the gastric walls. Alternatively, a doughnut-shaped ring may be inflated to an amount sufficient to create intragastric tension and induce satiety. A c-ring including at least one balloon may be placed at a segment of the stomach, where the balloon inflates to a size that creates tension at the segment. A biocompatible material can be injected into the fundus and antrum of the stomach to stiffen the gastric wall to create a fullness feeling.