The smell even the sight of delicious arom of food stimulates the hunger. When we smell,the airborne substances get dissolved in the watery film of nasal mucus.the chemoreceptors in nose which are also called as olfactory receptors...which trigger signals in the form of nerve impulses to the brain where smell is defected ..the amount of neurosecretory protein hormone ghrelin in the blood increases as a result of visual stimulation images of food..hunger contractions start to occur in stomach due to hunger generating signals that reach the brain .. INCREASE IN GREHLIN LEVELS RESULTS IN SENSATION OF HUNGER AND MOTIVATION TO CONSUME FOOD...
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