DAIRY PROTEIN FORTIFICATION IN CONFECTIONERY: NUTRITIONAL SIGNIFICANCE, FUNCTIONAL BEHAVIOR, AND QUALITY EFFECTS

Abstract

Confectionery products such as chocolate, caramel, toffee, and nougat are widely consumed, but they are usually low in protein. Adding dairy proteins offers a practical route to improve their protein contribution, yet the same ingredients that raise protein content can alter flow, texture, melting, color, and flavor. This review examines the nutritional and functional roles of whey protein concentrate, whey protein isolate, milk protein concentrate, micellar casein, and casein-rich ingredients in protein-enriched confectionery, with emphasis on evidence from chocolate and frozen desserts. Milk proteins provide all indispensable amino acids and are digestible, but the nutritional value of a fortified product depends on the ingredient composition, the amount added, processing, and the final serving size. Direct product studies show that whey protein ingredients can increase viscosity and yield stress, modify hardness and fracture behavior, change melting profiles, and influence surface bloom, although the direction and magnitude of these effects are formulation-specific. In milk chocolate, 6% whey protein concentrate or its hydrolysate increased apparent viscosity without major sensory changes, whereas high-protein white and dark chocolates containing whey protein isolate and erythritol developed firmer structures and greater melting resistance. Evidence for caramel, toffee, and nougat remains limited. The review identifies the need for controlled comparisons of protein types, complete formulation reporting, integrated sensory and storage testing, and pilot scale validation. Dairy protein fortification is feasible, but it should be treated as a reformulation step whose nutritional benefit must be demonstrated in the finished product rather than assumed from ingredient composition.