What is the term for the estimated amount of nutrients needed for half of a population?

The term for the estimated amount of nutrients needed for half of a population is the Estimated Average Requirement (EAR). The EAR serves as a key parameter in nutrition assessments, specifically reflecting the average daily intake level of a nutrient that is sufficient to meet the requirements of half the healthy individuals in a particular life stage and gender group. This measure is particularly useful for researchers and policymakers as it helps in the development of dietary guidelines and recommendations.

The Recommended Dietary Allowance (RDA), on the other hand, is set higher than the EAR and aims to meet the needs of approximately 97-98% of a population. The Upper Level Intake (UL) defines the highest level of daily nutrient intake unlikely to cause adverse health effects in the general population. Lastly, Adequate Intake (AI) is established when there is insufficient evidence to develop an RDA but is set at a level assumed to ensure nutritional adequacy. Each of these terms is significant in nutrition but serves different purposes in dietary recommendations and assessments.