Which of the following is NOT a major nutrient in the human body?

Vitamins are classified as micronutrients rather than macronutrients. They are essential for various biochemical processes in the body but are required in smaller amounts compared to macronutrients, which include carbohydrates, lipids, and proteins. Carbohydrates provide energy, lipids serve as a source of energy and are important for cell structure, while proteins are crucial for muscle development and repair and act as enzymes and hormones. Each of these macronutrients is needed in larger quantities compared to vitamins, which are vital for supporting metabolism and maintaining health but do not serve as direct sources of energy or structural components in the same way. This distinction is important in understanding the role of different nutrients in human nutrition and health.