International Board of Certified Lactation Consultant (IBCLC) Practice Exam

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What are the two types of proteins found in milk?

Whey and casein
Albumin and globulin
Peptides and enzymes
Fibrin and gelatin

The correct answer is: Whey and casein

Milk contains two primary types of proteins: whey and casein. These proteins play critical roles in nutrition and the biological function of milk. Whey protein is a soluble protein that remains in liquid form after milk has been curdled and strained. It is known for its high biological value and rich amino acid profile, making it an excellent source of nutrition that supports muscle growth and immune function. Casein, on the other hand, is the primary protein found in milk and cheese, making up about 80% of the total protein content. Unlike whey, casein forms a gel or curd in the stomach, which leads to a slow release of amino acids into the bloodstream. This characteristic is beneficial for sustained nourishment and is often a preferred protein source in infant formula. Understanding the distinction between these two types of proteins is crucial for lactation consultants and healthcare providers as they guide parents in infant feeding choices and address any nutritional concerns related to milk and dairy products.