What is the purpose of an Adequate Intake (AI) value in nutrient guidelines?

• A. AI is the minimum requirement for all populations.
• B. AI is used when data are insufficient to establish an RDA.
• C. AI is the maximum safe intake.
• D. AI is always higher than the RDA.

Answer: (B)

The main idea is that an Adequate Intake is used when there isn’t enough scientific data to establish an estimated average requirement and, therefore, an RDA. In those cases, experts base the AI on observed intakes in healthy populations or on balance/estimation studies to indicate a level that appears to support nutritional adequacy. This makes AI a practical guide for planning and evaluating intake, but it carries more uncertainty than an RDA because it isn’t tied to a precise requirement. It’s not intended as a guaranteed minimum for everyone, nor a maximum safety limit, and it doesn’t have to be higher than the RDA (and can be lower depending on the nutrient and population).