Topic overview

Start with the big picture

An RDA is set from the EAR with a safety margin, aiming to cover the needs of 97–98% of healthy individuals. Recommendations vary with factors such as age, sex, pregnancy or lactation, activity, and assumptions about diet and absorption. The topic surveys guidance for energy, protein, carbohydrates, fat, vitamins, minerals, and electrolytes, while distinguishing recommended intake from the Tolerable Upper Intake Level (UL), above which toxicity may be a concern. RDAs are used in dietary planning, food labeling, fortification policy, and clinical assessment. These values are reference tools for healthy populations, not a single universal target for every individual.