Dietary Reference Intakes (DRIs) are a set of guidelines developed by the National Academy of Medicine that provide recommendations for nutrient intake to maintain good health. These guidelines include Estimated Average Requirements (EAR), which is the average daily amount of a nutrient needed to meet the needs of 50% of the population, and Recommended Dietary Allowance (RDA), which is the average daily amount of a nutrient that should be sufficient for 97-98% of healthy individuals. The DRIs also include Adequate Intakes (AI) when there isn't enough data to establish an EAR or RDA, and Tolerable Upper Intake Levels (UL), which is the maximum daily intake that is likely to be safe for almost all adults. These guidelines are used by nutritionists and dietitians to develop personalized meal plans based on a person's age, gender, weight, and other factors.