The Recommended Dietary Allowances (RDAs) are guidelines established to help individuals meet their nutritional needs. They provide specific daily intake levels for essential nutrients, such as vitamins and minerals, based on age, sex, and life stage. RDAs aim to prevent deficiencies and promote overall health. These guidelines are developed by the Food and Nutrition Board of the National Academies of Sciences, Engineering, and Medicine. RDAs are part of a broader set of recommendations known as the Dietary Reference Intakes (DRIs), which also include other measures like Adequate Intake (AI) and Tolerable Upper Intake Level (UL).