What is the role of proteins in the body, other than building tissues?

Proteins serve a variety of crucial roles in the body, and one of their primary functions, aside from building and repairing tissues, is acting as enzymes and hormones. Enzymes are proteins that facilitate biochemical reactions throughout the body, speeding them up and enabling processes such as digestion and metabolism. Hormones, which are also often proteins, act as chemical messengers that regulate various physiological activities, such as growth, metabolism, and mood. The roles of enzymes and hormones are vital for maintaining homeostasis and facilitating communication between different systems in the body.

While proteins can be involved in providing energy and other functions, their roles as enzymes and hormones are fundamental to the body's functioning. This differentiates them from other macronutrients and emphasizes the versatility and importance of proteins in biochemical processes beyond mere structural support.