Crash Course with Hank Green
The strong link between taste and emotions has to do with our evolution: Taste helped us “test” the food we ate, so it was important for our survival. A bitter or sour taste was an indication of poisonous plants or of rotting protein-rich food. Sweet and salty tastes are often a sign of nutrient-rich foods.
One researcher described it as the ability to distinguish between a house and a car, if you happen to have a fingertip the size of the Earth.
Taste and Smell