Why is protein an important part of a healthy diet?

• A. It is needed to change glucose to energy.
• B. It is needed to store nutrients.
• C. It is needed to repair tissues.
• D. It is needed to produce water.

Answer: (C)

Proteins supply the amino acids used to build and repair the body’s tissues. When you grow, heal from injuries, or work out, your muscles, skin, and other organs need these building blocks to stay healthy and function well. Proteins also help make enzymes, hormones, and antibodies, which support digestion, signaling, and immunity. The other ideas aren’t the main job of protein: turning glucose into energy is mainly the role of carbohydrates and fats, storage is handled by fats and stored carbohydrate (glycogen), and producing water comes from general metabolic reactions, not from protein’s primary purpose. So repairing and maintaining tissues is why protein is important in a healthy diet.