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What is the relationship between Estimated Average Requirement (EAR) and Recommended Dietary Allowance (RDA)?

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This figure shows that the Estimated Average Requirement (EAR) is the intake at which the risk of inadequacy is 0.5 (50 percent) to an individual. The Recommended Dietary Allowance (RDA) is the intake at which the risk of inadequacy is very small—only 0.02 to 0.03 (2 to 3 percent).
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