Nutrient Adequacy Assessment Using Food Consumption Surveys (1986) / Chapter Skim
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3. Nutrient Requirements As A Basis for Dietary Evaluation
3. Nutrient Requirements As A Basis for Dietary Evaluation
Pages 10-16
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From page 10... ...
Although variability generally applies to all nutrients, its nature is known to be specific to certain nutrients. Dietary standards are usually described as recommended dietary allowances, safe levels of intake, or other similar terms.
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From page 11... ...
me principle still holds, however, that the recommended intake level generally exceeds the estimated requirements and, hence, the needs of almost all persons. Dietary standards for energy intake are different from those for specific nutrients because the level published for energy is usually the estimated mean requirement, i.e., one-half of the persons are expected to have higher needs and one-half, lower needs (FAO/WHO/UNU, in press; Health and Welfare, Canada, 1983)
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From page 12... ...
Such refinement should permit the development of improved statistical approaches to survey interpretation through the use of information about nutrient requirements. Until exact information about requirements is available, the resultant inferences about prevalence must be considered imprecise, although the probability approach is superior to other possible methods.
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From page 13... ...
but have ~ similar goal of establishing levels of intake that will maintain a state of nutriture beyond the mere prevention of clinical deficiency disease. For example, adequate iron intakes are regarded as those that maintain reasonable iron stores rather than those that merely stabilize mild anemia or maintain hemoglobin at physiologically normal levels (FAD/WHO, 1970; Health and Welfare Canada, 1983; NRC, 1980)
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From page 14... ...
Such information may not have been presented because those reports are intended primarily for use in developing a single requirement to meet the needs of all healthy individuals. FIXED CUTOFF POrNTS It is a common practice to use fixed cutoff points to estimate the adequacy of nutrient intake.
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From page 15... ...
AREA OF OVER LAP I NAD EQUATE ADEQUATE INTAKE OF NUTR I ENT X FIGURE 3-1. The distributions of people who truly fail to meet their requirement (inadequate)
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From page 16... ...
is that the choice of the optimal cutoff point to estimate prevalence or changer in prevalence depends upon a rather exact estimate of the prevalence being sought -- an impossibility. Estimates of prevalence using less than optimal cutoff points can be corrected (Rogan and Gladen, 1978)
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