What is the AMDR for carbohydrates?

Question

BlackTom AI · Accepted Answer

The Acceptable Macronutrient Distribution Range (AMDR) for carbohydrates is 45–65% of total daily energy intake.

1) Relevant knowledge points and concepts
- AMDR (Acceptable Macronutrient Distribution Range) gives recommended percent ranges of total daily calories from each macronutrient to reduce chronic disease risk and ensure adequate intake of essential nutrients.
- The Institute of Medicine/National Academies set typical AMDRs: carbohydrates 45–65%, protein 10–35%, fat 20–35%.

2) Step-by-step reasoning
- Recall the official AMDR values from the Dietary Reference Intakes: carbohydrates are assigned the highest percent range because they are the primary energy source for the brain and muscles.
- Compare the answer choices to these standard ranges to identify the match.

3) Calculations (intermediate steps shown)
- For a 2,000 kcal/day diet, convert the percent range to calories:
  - Lower bound: 45% of 2,000 = 0.45 × 2000 = 900 kcal
  - Upper bound: 65% of 2,000 = 0.65 × 2000 = 1,300 kcal
- Convert calories to grams of carbohydrate (4 kcal per gram):
  - Lower bound grams: 900 kcal ÷ 4 kcal/g = 225 g
  - Upper bound grams: 1,300 kcal ÷ 4 kcal/g = 325 g
- Thus, 45–65% corresponds to about 225–325 g carbs on a 2,000 kcal diet.

4) Why the correct answer is correct
- The option "45–65%" matches the established AMDR for carbohydrates from authoritative nutrition guidelines, reflecting recommended energy contribution from carbohydrates for most healthy individuals.

5) Why the other options are incorrect
- a. 10–35% is the AMDR for protein, not carbohydrates.
- b. 20–35% is the AMDR for fat (approximate), not carbohydrates.
- c. 35–55% is not a standard AMDR range; its lower bound is too high for protein/fat and upper bound too low for carbohydrates.

6) Conclusion
- Therefore, the correct choice is d. 45–65%, which matches the provided answer.

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