The primary function of protein in the human body is to support growth and repair of tissues. Proteins are essential macronutrients made up of amino acids, which are necessary for building muscles, organs, skin, and other tissues. Additionally, proteins play a critical role in the production of enzymes, hormones, and immune system components, contributing to various bodily functions. Consuming adequate protein is crucial for overall health, particularly for those engaged in physical activity, as it aids in recovery, muscle development, and maintaining muscle mass.