Which of the foods below does not contain dietary fiber?

Question

BlackTom AI · Accepted Answer

Dietary fiber consists of plant-derived carbohydrate components (cellulose, hemicellulose, pectin, lignin) that resist human digestive enzymes and contribute to stool bulk and gut health. Animal tissues do not contain these plant cell‑wall polymers, so they contain essentially zero dietary fiber.

1) Relevant knowledge points
- Dietary fiber only occurs in plant foods (fruits, vegetables, legumes, whole grains, nuts, seeds).  
- Animal muscle (meat) is made of proteins and fats, not plant cell walls, so it contains no fiber.

2) Step-by-step reasoning
- Examine each option and ask: is this a plant food (likely to contain fiber) or animal food?
  a) Bananas — a fruit (plant) and a known source of soluble and insoluble fiber.  
  b) Legumes — seeds of plants (beans, lentils, peas) and among the highest fiber foods.  
  c) Beef steak — from an animal (muscle tissue), not plant-derived.  
  d) Spinach — a leafy vegetable, provides dietary fiber.

3) Intermediate numeric examples (illustrating fiber content)
- Medium banana ≈ 3 g fiber.  
- Cooked lentils or black beans, 1 cup ≈ 12–16 g fiber.  
- Raw spinach, 100 g ≈ 2–3 g fiber (cooked yields more per cup).  
- Beef steak, 100 g ≈ 0 g dietary fiber.

4) Why the correct answer is correct
Beef steak contains only proteins, fats, and water; it lacks plant cell‑wall carbohydrates (cellulose, pectin), so it provides effectively zero dietary fiber. This matches the biochemical definition of fiber.

5) Why the other choices are incorrect
- Bananas (a) contain fiber and cannot be the no‑fiber choice.  
- Legumes (b) are high‑fiber foods.  
- Spinach (d) is a vegetable that contributes fiber. Each of these therefore does contain dietary fiber.

6) Conclusion
Because only the animal-derived option lacks plant cell‑wall carbohydrates, the correct answer is c. Beef steak, which matches the provided answer.

Which of the foods below does not contain dietary fiber?单项选择题

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