Which macronutrient is vital for nearly every function of the body, including acting as a solvent, transporting nutrients, and regulating body temperature?

• A. Carbohydrate
• B. Fat
• C. Water
• D. Protein

Answer: (C)

Verified step by step guidance

1. Identify the macronutrients listed in the problem: Carbohydrate, Fat, Water, and Protein.
2. Recall the primary functions of each macronutrient: Carbohydrates provide energy, fats store energy and support cell structure, proteins build and repair tissues, and water acts as a solvent, transports nutrients, and regulates body temperature.
3. Understand that water, although not a source of calories like the other macronutrients, is essential for nearly every physiological function in the body.
4. Recognize that water's unique roles include dissolving substances (acting as a solvent), facilitating nutrient transport through the bloodstream, and helping maintain body temperature through processes like sweating.
5. Conclude that the macronutrient vital for these functions is water.