What physiological factors produce hunger?

Can any one help me on what factors physiology produces hunger.
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"Cholecystokinin (CCK) is a neuropeptide hormone in the gastrointestinal system which stimulates the digestion of fat and protein. This hormone is generated by I-cells in the mucosal epithelium of the small intestine and secreted in the duodenum. It causes the release of digestive enzymes by the pancreas and bile by the gall bladder. "
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"Hunger is the set of internal experiences that lead a human or animal to seek food. Appetite describes the preferences that surround the selection of food that is found. For many people, hunger is a set of feelings often focused on the stomach. It may be associated with contractions of the stomach or intestine, and described as ""emptiness."" Indeed, many of the early ideas about hunger and its opposite, satiety, were described in terms of stomach contractions or stomach distension. Increased physiological understanding has yielded the information that the stomach and intestine are only one part of the system experienced as hunger. "
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