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Reference Daily Intake. The Reference Daily Intake or Recommended Daily Intake (RDI) is the daily intake level of a nutrient that was considered in 1968 to be sufficient to meet the requirements of 97â98% of healthy individuals in every demographic in the United States.
The US standards are based primarily on the 1968 Recommended Dietary Allowances (RDAs), whereas the Canadian standards are based on the 1983 Recommended Nutrient Intakes. As the committee noted, it is appropriate to use the new Dietary Reference Intakes (DRIs) as the basis for these reference values.