Our lips and tongue are highly sensitive to stimulation. That our taste buds respond pleasurably to certain kinds of foods containing sugar, salt, and fats is the product of millions of years of evolutionary adaptation. So is the fact that our body has a tendency to store fat. If fat was stored in times of plenty it was available as a reserve in times of scarcity when game and other food was hard to find. The tendency of the body to store fat once had considerable survival value even though now in our times, in many developed societies, many people wish it did not work quite so well.
Obesity is now a serious public health problem.
In our sedentary lifestyle with our fat and sugar rich diets we really are fish out of water. Our preferential tastes for fats and sugars evolved in natural environments in which they were relatively scarce. There are few fat hunter-gatherers. Their active lifestyle keeps them fit. Babies have an innate, evolutionary developed and natural preference for sweet tastes.