While we only have a few varieties of taste receptors on our tongue(salty,sweet,bitter,sour) volatile compounds from the food are inhaled and our much more developed sense of smell picks them up. Our brains combine the information to give you the full taste of a food item. The smell actually overrides the actual taste quite a bit, which is why if you blindfold someone, and have them bite an apple while you hold an onion under their nose, they will “taste”onion.
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