A recent study has investigated how the addition of milk to coffee affects oral friction and sensory perception, revealing that the structural reorganization of the milk matrix plays a crucial role. Researchers observed that milk proteins, when interacting with coffee tannins, form aggregates that modify the lubricity of the mixture in the mouth. This phenomenon directly influences the tactile sensation and the flavor profile perceived by the consumer.

This work focused on characterizing the microstructural changes that occur in coffee-milk systems. A combination of rheological and tribological techniques was used to measure friction between surfaces simulating oral tissue, as well as sensory analyses with tasting panels. The results showed that the formation of protein-tannin complexes reduces friction in the mouth, which correlates with a perception of greater smoothness and creaminess in the beverage.

This advance not only provides a deeper understanding of the science behind a widely consumed beverage but also opens avenues for optimizing food products. By understanding how composition and microstructure influence tribological and sensory properties, manufacturers could develop new formulations of coffee with milk or other dairy products and beverages, adjusting texture and mouthfeel to enhance the consumer experience. Furthermore, it could have implications for the design of foods for special diets, where texture is a critical factor.