RDA - NUTRIENT NEEDS In the United States the nutritional...

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NUTRIENT NEEDS In the United States the nutritional needs of the public are estimated and expressed in the Recommended Dietary Allowances (RDA). These were initially established during World War II to determine in a time of possible shortage, what levels of nutrients were required to ensure that the nutrition of the people would be safeguarded. At the start of the war a priority was to determine how many men must remain at home to provide essential services. This included providing food for those in the US as well as the soldiers overseas. To estimate the need it was required that some information be available regarding what amount of food was necessary to provide enough nutrients to keep people productive, but not in excess. Nutritionists realized they did not know the answer. National Academy of Science The RDA are established by the Food and Nutrition Board of the National Research Council , whose members come from the National Academy of Sciences, the National Academy of Engineering and the Institute of Medicine. While established by an act of congress, the National Academy is not an arm of the government and acts independently of congress. The National Academy appoints a group of scientists to establish or update RDAs. At one time the RDA for all nutrients was determined by the same group and published as one document. More recently they have been changed to RDI (see below) and there are several groups that work on more specialized teams. RDA The RDA are the levels of intake of essential nutrients considered, in the judgment of the Food and Nutrition Board on the basis of available scientific knowledge, to meet the known nutrition needs of practically all healthy persons. The NAS-NRC recognizes that diets are more than combinations of nutrients and should satisfy social and psychological needs as well. Over the years RDA been revised a number of times Recently there have been political considerations RDA have been replaced with RDI Dietary Reference Intakes(DRI) Include: AI = Acceptable Intake RDA = Recommended Dietary Allowance EAR = Estimated Average Requirement
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UL = Tolerable Upper Limit It is not important that you know the difference between RDA and RDI. In time I expect RDA will disappear. In the near future you will see it used more than RDI. I will use the two interchangeably. The RDA as will be documented below is a high goal to aim for when establishing diets for populations. The EAR is an estimate of what the average persons requires. The UL is an important recent addition. It is the most of a nutrient a person should consume in a day. Those who feel they need more of everything should become familiar with these values. They are especially important for children. The top two causes of poisoning of children under the
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age of three are consumption of excess iron and vitamin A, usually from adult supplements. For some nutrients we do not have enough information to establish a
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RDA - NUTRIENT NEEDS In the United States the nutritional...

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