DRI, or Dietary Reference Intake, refers to a set of guidelines established to help individuals understand the appropriate amounts of nutrients they need for optimal health. These guidelines are developed by experts and are based on scientific research, taking into account factors such as age, sex, and life stage. The DRI includes several components, such as Recommended Dietary Allowance (RDA), Adequate Intake (AI), and Tolerable Upper Intake Level (UL). Each component serves a specific purpose, helping people to avoid deficiencies and reduce the risk of chronic diseases by providing a framework for balanced nutrition.