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Cholecystokinin is secreted by I-cells in the small intestine and induces contraction of the gall bladder, relaxes the sphincter of Oddi, reduces of gastric acid secretion, increases bile acid production in the liver, delays gastric emptying, and induces digestive enzyme production in the pancreas.
When you eat fats they pass through the stomach into the small intestine in the form of chyme. Fat in the chyme stimulates the release of cholecystekinin (CCK), which is the hormone that stimulates the gallbladder to release bile.