Which macronutrient is NOT considered in discussions of nutrient density?

Nutrient density refers to the amount of essential nutrients in a food relative to its energy content. When discussing nutrient density, the focus is primarily on macronutrients such as carbohydrates, proteins, and fats, along with micronutrients like vitamins and minerals. These components are essential for various bodily functions and are often evaluated to assess the nutritional quality of foods.

Water, while essential for life and plays a critical role in bodily functions, is not classified as a macronutrient or micronutrient in the context of nutrient density. Instead, it is categorized separately, and its contribution to energy content is negligible. Consequently, nutrient density assessments emphasize the nutrient content of food in relation to its calorie content, omitting water from this specific discussion. This distinction clarifies why water is not considered in discussions about nutrient density, making it the correct answer to the question.