What is the primary role of proteins in the body?

The primary role of proteins in the body is to supply amino acids. Proteins are composed of long chains of amino acids, which are the building blocks necessary for the synthesis of new proteins that support various physiological functions. Amino acids play crucial roles in the growth and repair of tissues, the production of enzymes, hormones, and neurotransmitters, and they are integral to many metabolic pathways.

While proteins can provide energy under certain circumstances, that is not their primary function. The body typically uses carbohydrates and fats as the main energy sources. Supporting immune function is also an important role of specific proteins, such as antibodies, but this is not their overarching primary role. Additionally, proteins do not regulate body temperature; instead, this function is more closely related to the balance of fluids and the activity of sweat glands. Thus, the correct emphasis on proteins is their role in supplying amino acids, which are essential for overall health and bodily function.