Which of the following is a macronutrient?

• A. Vitamins
• B. Minerals
• C. Water-soluble vitamins
• D. Carbohydrates, fats, proteins

Answer: (D)

Macronutrients are the nutrients needed in larger amounts and provide most of the body's energy and building blocks. The key energy-providing macronutrients are carbohydrates, fats, and proteins, which supply calories in the diet. Vitamins and minerals are micronutrients required in much smaller amounts and primarily serve as cofactors in metabolic reactions. Water is essential and required in large amounts too, but it does not provide energy. So listing carbohydrates, fats, and proteins captures the nutrient group that supplies calories in larger amounts.