Energy density is a measure of the ________per ounce or gram of food.

Question

BlackTom AI · Accepted Answer

Energy density expresses the number of calories per ounce or gram of food — calories are the unit of energy.

1) Relevant knowledge points and concepts
- A calorie is a unit of energy; food energy is commonly expressed in kilocalories (kcal).
- Energy density = energy (kcal) ÷ weight (g or oz). It tells how many calories are packed into a given mass of food.
- Macronutrients have characteristic energy values: fat ≈ 9 kcal/g, protein ≈ 4 kcal/g, carbohydrate ≈ 4 kcal/g, fiber varies (~1–2 kcal/g depending on fermentation).

2) Step-by-step reasoning
- The phrase “per ounce or gram of food” asks for a quantity measured relative to weight. That quantity must be energy content, i.e., calories.
- Energy density is therefore the calories contained in each unit of weight. This fits the definition directly.

3) Calculations with intermediate steps (examples)
- Example A: A medium apple ≈ 95 kcal and ≈182 g.
  - Energy density = 95 kcal ÷ 182 g = 0.522 kcal/g (≈0.52 kcal/g).
- Example B: Half an avocado ≈ 322 kcal and ≈150 g.
  - Energy density = 322 kcal ÷ 150 g = 2.147 kcal/g (≈2.15 kcal/g).
These calculations illustrate calories per gram (or per ounce if you convert grams to ounces).

4) Why the correct answer is correct
- The term “energy density” by definition quantifies energy per unit mass; calories are the measure of that energy. Thus “calories” fills the blank accurately.

5) Why the other options are incorrect
- Fat: a macronutrient that contributes calories (9 kcal/g) but is not the metric “per ounce or gram of food” that energy density describes.
- Protein: a macronutrient (≈4 kcal/g) — again, not the definition of energy density.
- Fiber: a component of food with low caloric contribution; it is not the unit of energy per weight.

6) Conclusion
The correct answer is calories, which matches the provided answer.

Energy density is a measure of the ________per ounce or gram of food.单项选择题

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