What is the Estimated Average Requirement (EAR)?

The Estimated Average Requirement (EAR) is defined as the nutrient intake level estimated to meet the requirements of half the healthy individuals in a particular life stage and gender group. This means that the EAR serves as a measure rather than a target for individual dietary intake, aiming to assess nutrient adequacy for populations. It is a critical value in nutrition science because it helps establish dietary guidelines and recommendations for nutrient intake.

Option B correctly identifies that the EAR is specifically set to meet the basic needs of half the population, acknowledging that there will be variations in nutrient requirements among individuals. This statistical measure is essential to inform public health initiatives and dietary planning, ensuring that nutritional needs are appropriately met for groups rather than focusing solely on individuals.

The other options do not accurately capture the definition of EAR. For instance, while the average requirement for healthy individuals might sound relevant, it lacks the specificity of catering to just half the population. Similarly, levels sufficient for optimal health or promoting good health do not strictly align with the EAR’s intent, which is more about meeting the minimum requirements for a significant portion of the population rather than optimal health aspirations.