The factors that can influence when you feel hungry and when you feel full are:
1. Cholecystokinin (CCK) - This protein is released when the food enters the stomach causing it to distend. This causes the valve connecting stomach and the intestine. This causes slow movement of the food from the stomach creating a sense of fullness.
2. Leptine - It is an apeite regulating hormone released by the fat cells. It acts on the hypothalamus to turn off the 'hunger-switch'. the amount of leptin produced is dependent on the amount of fat present in the fat cells. However, the eating patterns of a person affect the release of this hormone causing the person to overeat.
3. Activity level - The greater the activity level of a person, the greater hunger will be felt byhim as the body try to obtain nourishment and enrgy for the activities.
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