Name a common source of complete proteins.

Complete proteins are those that contain all nine essential amino acids required for health. Common sources of complete proteins include animal products such as meat, dairy, and eggs. These foods provide a balanced array of amino acids that the body cannot synthesize on its own, making them vital for muscle repair, immune function, and overall health.

While other options might contribute to a healthy diet, they typically do not provide all essential amino acids in sufficient quantities or ratios. For example, fruits and vegetables generally lack complete protein profiles, beans and legumes are often low in certain essential amino acids, and while whole grains can contribute protein to the diet, they are also not considered complete proteins. Therefore, animal products stand out as a reliable source of complete proteins in human nutrition.