A very active 24-year-old male consumes 4,000 kcal/day. Based on his current energy intake, he should get an average of _____ grams/day of total dietary fiber.

Question

A very active 24-year-old male consumes 4,000 kcal/day. Based on his current energy intake, he should get an average of _____ grams/day of total dietary fiber.

BlackTom AI · Accepted Answer

The dietary-fiber density target used for energy-based recommendations is 14 grams of fiber per 1,000 kcal consumed. This guideline comes from the Dietary Guidelines/Institute of Medicine approach that links fiber needs to energy intake to ensure adequate fiber for higher-calorie diets.

Step-by-step calculation:
1. Determine how many 1,000-kcal units are in 4,000 kcal:
   4,000 kcal ÷ 1,000 kcal/unit = 4 units.
2. Multiply the number of units by the fiber recommendation per unit:
   4 units × 14 g fiber/unit = 56 g fiber/day.

Intermediate steps shown: 4,000/1,000 = 4; 4 × 14 = 56. Therefore, a person consuming 4,000 kcal/day should aim for 56 grams of total dietary fiber per day to meet the 14 g/1,000 kcal density recommendation.

Why this is correct: The question asks for fiber based on energy intake, not age-based or simple per-year rules. Using the energy-density standard directly yields 56 g/day, which is higher than the general Adequate Intake (AI) for adult males (38 g/day) because this individual’s caloric intake is substantially above typical levels.

Why the other options are incorrect:
- 24 g (1 g per year of age): That “1 g per year” rule is not the adult standard for total dietary fiber; it would not account for caloric intake.
- 35 g: Close to the male AI (38 g) but does not reflect the energy-based 14 g/1,000 kcal calculation required here.
- 40 g (1 g per 100 kcal): This implies 10 g per 1,000 kcal, which is not the recommended density.
- 16 g and 21 g: These are well below both energy-based and age/sex-based recommendations for an active adult male consuming 4,000 kcal.

Final confirmation: Using 14 g fiber per 1,000 kcal × 4 (for 4,000 kcal) gives 56 g/day. The correct answer is 56.

A very active 24-year-old male consumes 4,000 kcal/day. Based on his current energy intake, he should get an average of _____ grams/day of total dietary fiber.单项选择题

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