Which of the following nutrients is not considered a macronutrient?

Water is classified as a micronutrient rather than a macronutrient because it is not a source of energy and does not provide calories. Macronutrients, which include carbohydrates, proteins, and fats, are essential for energy, growth, and bodily functions; they are required in larger amounts compared to micronutrients like vitamins and minerals. While water is vital for life and plays crucial roles in hydration, temperature regulation, and biochemical reactions, it does not fall into the category of macronutrients that deliver energy, making it the correct identification in this context.