Dietary Reference Intake (DRI) refers to a set of guidelines established to help individuals understand the amount of nutrients they need for optimal health. These guidelines include various categories, such as Recommended Dietary Allowance (RDA), Adequate Intake (AI), and Tolerable Upper Intake Level (UL), which provide specific recommendations for different age groups and genders. The DRI is used by health professionals to assess and plan diets, ensuring that people receive essential vitamins and minerals. By following these guidelines, individuals can reduce the risk of nutrient deficiencies and chronic diseases, promoting overall well-being and health.