Which function is NOT performed by proteins in our bodies?

Proteins serve various essential functions in the body, including growth and maintenance, immune system response, and fluid and electrolyte regulation. However, while proteins can technically be used for energy production, this is not their primary role in the body, which makes this function less significant compared to the others listed.

Proteins are primarily responsible for building and repairing tissues, serving as enzymes, and participating in immune responses. They also play a crucial role in regulating the balance of fluids and electrolytes, ensuring that the body maintains homeostasis.

In terms of energy production, carbohydrates and fats are the preferred energy sources for the body. When energy is needed and carbohydrate stores are low, the body can break down proteins through a process called gluconeogenesis. However, this is not the most efficient or preferred way to generate energy, as the use of proteins for this purpose can compromise other essential functions those proteins serve.

Thus, while proteins can contribute to energy production, it is not considered a primary function, making this choice the correct answer to the question.