Which of the following is categorized as a micronutrient?

Micronutrients are essential nutrients required by the body in smaller amounts compared to macronutrients, which include proteins, carbohydrates, and fats. Water, while not an energy source, is fundamental for various bodily functions, including hydration, temperature regulation, and waste elimination. It is classified as a micronutrient because it is essential for maintaining health and is involved in numerous biochemical processes, even though it does not provide calories.

The other options—protein, carbohydrates, and fats—are considered macronutrients as they provide energy (calories) and are needed in larger quantities for growth, metabolism, and other physiological functions. Understanding the classification of nutrients is crucial for athletic training and overall nutrition, as both micronutrients and macronutrients play vital roles in maintaining health and performance.