Which factor below has a direct effect on the calculation of nutrient density?

• A. Weight.
• B. Volume.
• C. Calories.
• D. Serving size.

Answer: (C)

Verified step by step guidance

1. Understand the concept of nutrient density: Nutrient density refers to the amount of essential nutrients (such as vitamins, minerals, and protein) a food provides relative to its calorie content. It is a measure of the nutritional value of a food per calorie.
2. Identify the factors listed in the problem: Weight, volume, calories, and serving size. Consider how each factor might influence the calculation of nutrient density.
3. Recognize that nutrient density is calculated by dividing the nutrient content of a food by its calorie content. The formula can be expressed as: $\frac{\mathrm{Nutrient} \mathrm{Content}}{\mathrm{Calories}}$. This shows that calories directly affect the calculation.
4. Evaluate the other factors: Weight and volume are physical properties of the food and do not directly influence the nutrient-to-calorie ratio. Serving size is a standardized portion but does not directly affect the calculation of nutrient density itself.
5. Conclude that calories are the factor with a direct effect on the calculation of nutrient density, as they are part of the formula used to determine the ratio of nutrients to energy provided by the food.