ISSA Nutritionist Practice Exam

Whey protein is a significant nutrient found in milk, making it the correct choice in this context. Milk contains two primary types of proteins: casein and whey. Whey protein is the liquid portion that separates from the curds during the cheese-making process, and it is known for being a high-quality source of protein that is rich in essential amino acids. This aspect is particularly important for muscle repair and growth, which is why whey protein is often highlighted in nutritional discussions related to physical fitness and dietary supplementation.

While milk does contain vitamins that contribute to its nutritional profile, they are not the predominant nutrient associated with milk. Similarly, fibers are predominantly found in plant foods rather than dairy products. Carbohydrates are present in the form of lactose in milk, but whey protein stands out as the main focus when discussing the nutritional components of milk, especially in contexts related to high-quality protein sources.