What is the primary role of proteins in the body?

The primary role of proteins in the body is to serve as major structural components. Proteins are essential macromolecules that are involved in building and repairing tissues, including muscles, bones, skin, and organs. They are made up of amino acids, which are the building blocks necessary for the growth and maintenance of cells and tissues.

In addition to their structural functions, proteins also play vital roles in various biochemical processes, such as enzyme catalysis and immune response. They contribute to the formation of enzymes and hormones that regulate numerous physiological processes. The complex structures of proteins allow them to perform their specific functions within the body effectively, making them indispensable for overall health and physical function.

Other options do not capture the primary role of proteins accurately. While proteins can provide energy and play roles in flavor and fat sources, these functions are secondary to their structural and functional roles in the body.