Which of the following is NOT a macronutrient?

Vitamins are indeed not classified as macronutrients. The primary macronutrients, which are essential for providing energy and supporting bodily functions, are carbohydrates, proteins, and fats. Each of these macronutrients plays a crucial role in our diet: carbohydrates serve as a primary energy source, proteins are vital for tissue repair and growth, and fats provide energy along with essential fatty acids that are important for various bodily functions.

In contrast, vitamins are considered micronutrients. They are required in smaller amounts compared to macronutrients but are critical for normal physiological functions, including metabolism, immune function, and overall health. Unlike macronutrients, vitamins do not provide calories or energy; instead, they support the body's metabolism and help enzymes function effectively. This distinction highlights why vitamins are categorized separately from macronutrients.