A student consumes 2000 calories a day and usually consumes 10 grams of fiber. How much fiber do they need to add to their diet to meet the fiber recommendations?单项选择题
A
2 grams
B
8 grams
C
6 grams
D
18 grams

Question

A student consumes 2000 calories a day and usually consumes 10 grams of fiber. How much fiber do they need to add to their diet to meet the fiber recommendations?

BlackTom AI · Accepted Answer

The fiber recommendation is 14 grams per 1,000 kilocalories, so for a 2,000-calorie diet the target is 28 grams.

1. Relevant knowledge points and concepts
- The Institute of Medicine (and common dietary guidance) recommends 14 grams of dietary fiber per 1,000 kcal consumed.
- To find an individual’s target fiber intake, multiply 14 g by the number of 1,000-calorie units in their daily energy intake.
- The amount to add = recommended intake − current intake.

2. Complete reasoning process step by step
- Determine how many 1,000-calorie units are in 2,000 calories.
- Multiply the recommendation per 1,000 kcal by that number to get the total recommended grams of fiber.
- Subtract the fiber already consumed to find how much extra is needed.

3. Calculations with intermediate steps
- Units of 1,000 kcal in 2,000 kcal: 2,000 kcal ÷ 1,000 kcal = 2.
- Recommended fiber: 14 g/1,000 kcal × 2 = 28 g.
- Amount to add: 28 g (recommended) − 10 g (current) = 18 g.

4. Why the correct answer is correct
- Applying the standard 14 g per 1,000 kcal rule yields a 28 g target for a 2,000-calorie diet. Since the student already eats 10 g, they must add 18 g to reach the 28 g recommendation. The arithmetic directly supports 18 grams as the needed increase.

5. Why the other options are incorrect
- 8 grams: would result from miscomputing the target as 18 g (instead of 28 g) and then subtracting current intake—incorrect base recommendation.
- 6 grams: inconsistent with any standard multiplication (would imply a 16 g target for 2,000 kcal).
- 2 grams: far too small; it would imply a target near 12 g for 2,000 kcal, which contradicts the 14 g/1,000 kcal guideline.

6. Conclusion
- The student needs to add 18 grams of fiber to their diet to meet the recommendation. This matches the provided correct answer: 18 grams.

A student consumes 2000 calories a day and usually consumes 10 grams of fiber. How much fiber do they need to add to their diet to meet the fiber recommendations?单项选择题

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