Which dairy protein is highlighted as high quality, especially in whey?

• A. Casein
• B. Whey
• C. Lactose
• D. Milk fat

Answer: (B)

High-quality dairy protein means having all the essential amino acids in the right amounts and being easy to digest. Whey fits this best because it’s a complete protein with a rich amino acid profile and it’s rapidly absorbed after ingestion. That rapid availability, especially of branched-chain amino acids like leucine, makes whey particularly effective for supporting muscle protein synthesis after exercise. Lactose is a sugar, not a protein, and milk fat is fat, so they aren’t the protein being described. Casein is also a dairy protein and is high quality too, but it digests more slowly, whereas whey’s quick digestion and strong essential amino acid content are what make it stand out.