A CCK secretion-promoting substance and a use thereof are provided. This cholecystokinin secretion-promoting composition contains, as an active component, acrylic acid and/or an unsaturated aldehyde having a main chain of 4-12 carbon atoms having a double bond in at least position 2 or 4, wherein the main chain has 4-9 carbon atoms if there is a double bond only in position 2 and the main chain has 9-12 carbon atoms if there is a double bond only in position 4. This cholecystokinin secretion-promoting composition can be used as an appetite suppressant. By adding this cholecystokinin secretion-promoting composition to food, appetite-suppressing food products can be provided.
