The feeding instinct, which is dependent on the physiological function of nutrition, ensures the survival of all animal species. Like all other behaviors, it is based on very complex determinant mechanisms. To examine these mechanisms and their role in regulating energy balance, experiments on animals are usually used, assuming that the neurobiological bases in humans are similar to those in animals.
However, in humans, social, cultural, educational, and psychological factors are added to the neurobiological bases and affect the primary mechanisms.
The hunger-satiety system is the basic basis for feeding intervals. The signal that leads to feeding is the level of glucose in the blood that cells can use immediately. The need for feeding is related to the change in blood glucose levels.
This internal signal combines with the positive external stimuli created by food to have an effect. Eating is the result of the combined effect of internal and external stimuli. The mobilization of fat reserves, which are the energy source of cells, when nothing is consumed, is another sign of hunger.
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