Eating is one of the few human activities that appeals to all five senses.
The pleasure felt when tasting food is influenced by sight, smell, touch and taste, but also by hearing: we hear the sounds produced by the food in our mouth.
The crispness of a food is a sign of quality associated with a freshly prepared product. The perception of this characteristic of texture emerges from kinesthetic stimuli (related to the muscular activity of the jaw) and auditory stimuli (related to the acoustic vibrations emitted when the food is broken).
Unlike melting foods, which make the caloric density of the food disappear by sending the message to the brain that we don't eat as much as we actually do, crunchy foods don't fool us. Touch and hearing confirm (with a bang) that we do eat.