Which of the following is NOT a macronutrient?

Vitamins are not classified as macronutrients. Instead, they fall under the category of micronutrients, which are essential for various bodily functions but are required in much smaller amounts compared to macronutrients. Macronutrients, which include carbohydrates, proteins, and fats, are vital for providing energy, supporting growth, and maintaining overall health. Carbohydrates serve as a primary energy source, proteins are crucial for tissue repair and muscle building, and fats play important roles in hormone production and nutrient absorption. In contrast, vitamins aid in processes such as metabolism, immune function, and the maintenance of healthy skin and vision, but they do not provide energy or serve as structural components of cells like the macronutrients do.