A researcher is using population intakes to estimate the prevalence of nutrient inadequacy in a community. Which DRI is most appropriate for calculating the proportion of the population below requirements and why?

• A. The EAR is most appropriate because it represents the intake estimated to meet the needs of 50% of individuals and is the statistical benchmark used to assess the prevalence of inadequacy in groups.
• B. The AI should be used in place of the EAR because it provides a precise statistical median that is always available even when evidence is lacking.
• C. The UL is best because comparing group intakes to an upper limit tells you who is inadequate and who is in excess, which directly estimates prevalence of deficiency.
• D. The RDA is most appropriate because it meets the needs of 97–98% of individuals and therefore gives the most conservative population estimate of inadequacy.

Answer: (A)