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DIETARY REFERENCE VALUES

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					DIETARY REFERENCE
      VALUES
• Dietary reference values (DRVs) are used
  to give an indication of the amount of a
  particular nutrient that is required in a
  balanced diet.
• No one individual value is given for any
  nutrient and the values are meant to be
  taken as guidelines rather than
  recommendations.
• Why?
• Where possible DRVs have been
  calculated from a normal distribution curve
  showing the daily requirement for energy
  or a dietary nutrient against the number of
  people in a particular group with that
  requirement.
 ESTIMATED AVERAGE REQUIREMENT
              (EAR)

The estimate of an average requirement of a
 population i.e. 50% of the population will
 need more, 50% will need less.

This value is given for energy as well as for
 macro- and micronutrients.
 REFERENCE NUTRIENT INTAKE (RNI)


Represents enough or more than enough to
 meet the needs of almost all (about 98%)
 of the population (even those with high
 needs). Habitual intakes above RNI are
 almost certainly adequate.
LOWER REFERENCE NUTRIENT INTAKE
            (LRNI):

Amount that is sufficient for people with low
 needs. Most people (98%) need more than
 this. Habitual intakes below the LRNI by
 an individual will almost certainly be
 inadequate.

RNI and LRNI values are only given for
 nutrients not energy.
Why do you think this is?
           SAFE INTAKES
• For micronutrients for which there was
  insufficient data to generate normal
  distribution curves a group of DRVs called
  SAFE INTAKES are used.
• Safe intake values represent enough to
  prevent deficiency but are well below the
  level at which the micronutrient would be
  toxic.

				
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posted:9/22/2011
language:English
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