Which of the following best described the definition of an adequate intake (AI)?[Fill in the blank]

Question

BlackTom AI · Accepted Answer

Adequate Intake (AI) is defined as the average daily nutrient intake level based on observed or experimentally determined approximations or estimates of nutrient intake by a group (or groups) of apparently healthy people that are assumed to be adequate.

1) Relevant knowledge points and concepts
- Dietary Reference Intakes (DRIs) include several reference values: Estimated Average Requirement (EAR), Recommended Dietary Allowance (RDA), Adequate Intake (AI), and Tolerable Upper Intake Level (UL).
- RDA: intake sufficient to meet the needs of nearly all (≈97–98%) healthy individuals in a life-stage/gender group; set when EAR is known.
- AI: used when evidence is insufficient to establish an EAR/RDA; based on observed or experimental estimates from healthy populations.
- UL: highest average daily intake likely to pose no risk of adverse health effects.

2) Step-by-step reasoning
- Determine which DRI description matches each option.
- Option b describes an intake that meets nutrient requirements of nearly all healthy individuals → this matches the RDA, not AI.
- Option a describes the highest average daily intake unlikely to cause harm → this matches the UL.
- Option c refers to an average intake that may help prevent chronic disease → this is not a standard DRI definition (could reflect public health goals but not AI).
- Option d describes an intake based on observed/experimentally determined approximations from healthy groups and assumed adequate → this matches the formal AI definition.

3) Calculations
- No numerical calculations are required for this definitional question.

4) Why the correct answer is correct
- Option d precisely quotes the standard AI definition used in DRI reports: AI is applied when scientific evidence is insufficient to derive an EAR/RDA and is based on observed intakes in healthy people.

5) Why other options are incorrect
- a = definition of UL (safety upper limit), not AI.
- b = definition of RDA, not AI.
- c = vague public-health statement, not the formal AI definition.

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

Which of the following best described the definition of an adequate intake (AI)?[Fill in the blank]单项选择题

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