What is the main function of protein in the body?

The primary function of protein in the body is to facilitate growth and repair of body tissue. Proteins are made up of amino acids, which are essential building blocks for the creation and maintenance of cells, tissues, and organs. Whenever the body undergoes growth, such as during childhood or puberty, or when recovering from injury, protein is crucial for building new cells and repairing damaged ones.

While proteins can participate in other functions, such as acting as enzymes or hormones, their role in tissue growth and repair is fundamental to maintaining overall health and bodily functions. This makes proteins particularly important for athletes or individuals recovering from surgery or injury, as they support muscle repair and the healing process.

Other options may refer to processes involving proteins but do not capture their primary role. For instance, while proteins can contribute to energy storage indirectly, this is not their main function. Additionally, absorption of nutrients is primarily the role of the digestive system and certain types of molecules like carbohydrates and fats. Hormonal regulation is more typically associated with specific proteins (hormones) but is not the overarching function of all proteins in the body.