Which of the following is the best source of protein?

Whey protein stands out as an excellent source of protein due to its high biological value, which means it contains all essential amino acids needed for the body. It is derived from milk during the cheese-making process and is quickly absorbed, making it ideal for muscle recovery and growth, especially after exercise. Whey is particularly rich in branched-chain amino acids (BCAAs), which play a crucial role in muscle protein synthesis.

While red meat, egg whites, and legumes are also good sources of protein, they have different characteristics. Red meat contains protein, but it is also higher in saturated fats and can be associated with health risks if consumed excessively. Egg whites provide a complete protein source, but they lack the additional benefits that whey offers in terms of rapid absorption and high BCAA content. Legumes are a plant-based protein source that often lacks some essential amino acids when consumed on their own, though they are a great option for vegetarians and vegans.

Overall, whey is considered the superior option in this context due to its quality, efficiency in protein absorption, and benefits related to muscle performance.