Which of the following nutrients is not considered a macronutrient?

Vitamins are not classified as macronutrients because they are required by the body in much smaller amounts compared to macronutrients. The macronutrients—proteins, carbohydrates, and fats—are essential for providing energy and serving structural and functional roles in the body. They are measured in grams and are crucial for growth, metabolism, and overall health.

In contrast, vitamins are categorized as micronutrients, which are needed in minute quantities. While they play vital roles in various biochemical processes and are necessary for the proper functioning of the body, their requirement does not reach the levels seen with macronutrients. Thus, understanding the distinctions between these nutrient categories is important for nutritional science and veterinary practice.