Which of the following is an example of a complete protein source?

A complete protein source is one that contains all nine essential amino acids in sufficient quantities to meet the body's needs. Eggs are considered a complete protein because they provide all these essential amino acids, making them an excellent choice for individuals looking to meet their protein requirements.

In addition to eggs, animal-based protein sources like meat and dairy also fall under the category of complete proteins. This makes eggs particularly valuable for those who may not consume a variety of protein sources regularly.

Other options, such as beans, rice, and nuts, do not provide all essential amino acids in balanced amounts. For instance, beans are typically low in methionine, and while rice can complement beans to form a complete protein, it on its own does not provide all essential amino acids. Nuts contain protein but are often low in lysine, which is essential for muscle repair and growth. Understanding the concept of complete versus incomplete proteins is key when evaluating dietary protein sources.