Dietary reference intake (DRI) is a set of guidelines that the National Academy of Sciences created in the 1990s for the US government. These guidelines incorporate other values, including:
RDAs and AIs tell you the amount of that nutrient you should strive for each day. These values are based on scientific evidence, and the amount of evidence will determine whether an RDA or an AI is given for a specific nutrient.
RDA is the the average daily dietary intake level that meets the nutrient requirements of nearly all healthy people in a specific life stage and gender group. The RDA is derived from the estimated average requirement (EAR), which is calculated from scientific evidence.
When there is not enough scientific evidence about a specific nutrient to calculate an EAR (and therefore an RDA), an AI is estimated instead. The AI for children and adults is expected to meet or exceed the nutrient needs of essentially all members of a specific healthy population.
The AI is based on the scientific research available. But, it is an indication that more research is needed to determine, with some degree of confidence, the necessary amount of a specific nutrient. When more research is done, it should be possible to replace AI estimates with RDAs.
UL is the highest level of daily nutrient intake that is likely to pose no risks of adverse health effects in almost all people in the specified life stage group. The UL is not a recommended level of intake. There is no established benefit for healthy people if they consume a nutrient in amounts above the RDA or AI.
These recommendations are for healthy people. People with diseases or conditions that affect their nutrient intake should work with their doctor or a dietitian to determine their specific nutrient needs.
For more information about DRIs, visit the US Department of Agricultures's Food and Nutrition Information Center.
RESOURCES:
American Dietetic Association
http://www.eatright.org/
Food and Nutrition Information Center
US Department of Agriculture
http://fnic.nal.usda.gov/nal_display/
CANADIAN RESOURCES:
Dietitians of Canada
http://www.dietitians.ca/
Health Canada
http://www.hc-sc.gc.ca/index_e.html/
Reference:
Most frequently asked questions about RDAs and DRIs. Nutrition Information Resource Center website. Available at: http://nirc.cas.psu.edu/pdf/RDADRI.pdf. Accessed May 18, 2010.
Smart nutrition 101: commonly asked questions. Nutrition.gov website. Available at: http://www.nutrition.gov/nal_display/index.php?info_center=11;tax_level=1;tax_subject=389. Updated April 14, 2010. Accessed May 18, 2010.
Last reviewed May 2010 by Brian Randall, MD
Please be aware that this information is provided to supplement the care provided by your physician. It is neither intended nor implied to be a substitute for professional medical advice. CALL YOUR HEALTHCARE PROVIDER IMMEDIATELY IF YOU THINK YOU MAY HAVE A MEDICAL EMERGENCY. Always seek the advice of your physician or other qualified health provider prior to starting any new treatment or with any questions you may have regarding a medical condition.
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