Dietary Reference Intakes
Meaning of Dietary Reference Intakes: Not one number per nutrient but several, each answering a different question, from an average requirement to the level where risk begins.
Definition of Dietary Reference Intakes
Dietary Reference Intakes are a set of nutrient reference values developed by scientific panels in the United States and Canada to describe how much of a vitamin, mineral or other nutrient supports health in people who are already healthy. The framework covers energy, macronutrients, vitamins, minerals and water, and the values differ by age, sex and life stage.
What values does the framework contain?
| Value | What it answers |
|---|---|
| Estimated Average Requirement | The amount that meets the needs of half the healthy people in a group; the statistical basis for the others |
| Recommended Dietary Allowance | The amount sufficient for nearly all healthy people in a group, set above the average requirement |
| Adequate Intake | An observed or estimated level used when the evidence is too thin to calculate an average requirement |
| Tolerable Upper Intake Level | The highest ongoing daily intake unlikely to cause harm; above it the risk of adverse effects rises |
| Acceptable Macronutrient Distribution Range | The share of total energy that should come from fat, carbohydrate and protein |
How do the values relate to one another?
The Estimated Average Requirement comes first, derived from studies of how much of a nutrient is needed to reach a defined marker of adequacy. The Recommended Dietary Allowance is then calculated from it, set high enough to cover almost everyone rather than the average person, which is why it is not a minimum. Where the underlying data will not support that calculation, an Adequate Intake is published instead, and it carries less certainty. The Upper Intake Level is separate from all of them: it is a ceiling for safety, not a target, and it applies to total intake from food, fortified products and supplements combined. The earlier Recommended Dietary Allowances were not discarded when the framework was built; they were folded into it as one value among several.
What are they used for?
Food labeling reference values, institutional menu planning, government nutrition programs and dietary assessment all draw on them. Clinicians and dietitians use them to judge whether reported intake of a vitamin or mineral sits within an expected range, and the Upper Intake Level is the figure most often consulted when a person takes a dietary supplement on top of a normal diet. Because the values describe healthy populations, they do not account for the altered requirements that illness, malabsorption or certain medicines create.
Also known as
Used in a sentence
The dietitian compared the patient's recorded nutrient intake against the relevant Dietary Reference Intakes for age and sex.
Good to know
Dietary Reference Intakes describe population-level reference values rather than a personalized target, so an individual's actual nutrient needs can differ from the general value listed for their age and sex group.