Which of the following is a class of energy-containing nutrient found in food?

Question

BlackTom AI · Accepted Answer

Fat is a macronutrient that stores and supplies energy, providing about 9 kilocalories per gram—more than carbohydrates or protein. Energy-containing (caloric) nutrients are the macronutrients: carbohydrates, fats (lipids), and proteins. Micronutrients and noncaloric components—vitamins, water, and most dietary fiber—do not provide usable energy in the way the macronutrients do.

1) Relevant knowledge points and concepts
- Macronutrients that supply energy: carbohydrates (~4 kcal/g), proteins (~4 kcal/g), fats (~9 kcal/g).
- Micronutrients and noncaloric components: vitamins (no calories), water (no calories), and fiber (largely non-digestible; generally not considered an energy source for human metabolism, though some fermentable fiber yields small calories from gut bacteria).
- Question asks which option is a class of energy-containing nutrient found in food.

2) Step-by-step reasoning
- Examine each choice against the definition “energy-containing nutrient”:
  a) Vitamins: essential micronutrients required in small amounts, do not provide calories → not an energy-containing class.
  b) Water: essential for life but provides 0 calories → not an energy-containing class.
  c) Fiber: a type of carbohydrate largely indigestible by human enzymes; most fiber is not classified as an energy-providing nutrient (although some fermentable fiber yields limited calories, fiber is not considered a primary energy-containing class).
  d) Fat: a macronutrient that is digested and metabolized to yield energy (~9 kcal per gram) → clearly an energy-containing nutrient class.

3) Calculations / intermediate numeric facts
- Fat energy density: 9 kcal/g.
- For comparison: carbohydrate ≈ 4 kcal/g, protein ≈ 4 kcal/g.
These numbers show fat is a concentrated energy source.

4) Why the correct answer is correct
- Fat qualifies as a class of energy-containing nutrient because it is a macronutrient metabolized to release significant calories used for body functions and storage.

5) Why the other options are incorrect
- Vitamins: no caloric value; function as cofactors and regulators.
- Water: no calories; essential solvent and transport medium.
- Fiber: not a primary energy source; largely indigestible and therefore not classified with energy-containing macronutrients.

6) Conclusion
Given the definitions and calorie values, the correct answer is fat, which matches the provided answer.

Which of the following is a class of energy-containing nutrient found in food?单项选择题

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