Define nutrient density and give an example illustrating the concept.

• A. Nutrient density is the ratio of calories to nutrients per serving.
• B. Nutrient density is the speed of nutrient absorption.
• C. Nutrient density is nutrients per calorie; example: kale is nutrient-dense; refined white bread is energy-dense but less nutrient-dense.
• D. Nutrient density relates to macro-nutrient distribution.

Answer: (C)