Proteins are the only nutrients that can do what for the body?

• A. Build and repair body tissues
• B. Provide energy
• C. Store minerals
• D. Transport oxygen

Answer: (A)

Proteins provide the amino acids that are the building blocks for the body's tissues. When you grow, heal, or replace worn-out cells, those amino acids are used to construct muscles, skin, organs, and connective tissue. This tissue-building role is what proteins uniquely supply, whereas carbohydrates and fats mainly give energy, and minerals and vitamins support metabolism and function rather than supplying the actual material for tissue construction. So the best choice highlights this direct contribution to growth and repair.