Final answer:
The AI is the recommended daily intake, the EAR is the estimated nutrient intake for half the population, the RDA is the amount needed for 97-98% of the population, and the UL is the highest daily amount without adverse effects.
Step-by-step explanation:
AI (Adequate Intake) - the recommended daily intake, based on observed approximations of nutrient intake of healthy people. It is used when there is not enough scientific evidence to set an RDA.
EAR (Estimated Average Requirement) - the estimated nutrient intake to meet the requirements of half the healthy individuals in a particular life stage and gender group.
RDA (Recommended Dietary Allowance) - the amount of nutrient needed to meet the requirement of 97 to 98 percent of the healthy population.
UL (Tolerable Upper Intake Level) - the highest daily amount of a nutrient that will not cause adverse health effects for most of the general population.