What distinguishes the protein composition of human milk from formula?

The distinguishing feature of human milk compared to formula is its protein composition, particularly the predominance of whey protein. Human milk is composed of approximately 60-80% whey proteins, which include important bioactive components and antibodies that support the infant’s immune system. Whey proteins are easier to digest than casein, the primary protein found in cow's milk and a significant component of many infant formulas. This digestibility is crucial for newborns and young infants as their digestive systems are still maturing.

In contrast, many infant formulas tend to have a higher proportion of casein protein, which results in a different digestion process and can potentially lead to a more substantial gastric load, which may not be as well tolerated by infants. The presence of whey protein in human milk not only aids in digestion but also supports nutrient absorption and overall growth in infants.

Other options present different aspects of human milk and infant formula but do not directly address the unique protein composition. While human milk does have a higher fat content compared to many formulas, it is the type and composition of the proteins that are more pivotal in distinguishing them. The carbohydrate content of human milk, specifically lactose, plays a significant role in energy provision, but it is not the distinguishing factor regarding protein. Additionally