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What is gastroparesis? Gastroparesis, also called delayed gastric emptying, is a disorder that slows or stops the movement of food from the stomach to the small intestine. Normally, the muscles of the stomach, which are controlled by the vagus nerve, contract to break up food and move it through the gastrointestinal (GI) tract.
Control of Stomach Emptying. The rate of emptying of the stomach is controlled by various factors originating in the duodenum and stomach, of which the duodenal factors are the most important. Gastric factors include increased volume of food in the stomach and stretching of the stomach wall.