Nutrient Adequacy Assessment Using Food Consumption Surveys (1986) / Chapter Skim
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1. Executive Summary
1. Executive Summary
Pages 1-6
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, a large study of the food consumption patterns in the United States, includes information on individual dietary intake, which serves as a basis for determining the magnitude of inadequate nutrition in the general population. To ensure that the estimates of inadequacy are based on scientifically valid parameters, the USDA asked the National Research Council to develop criteria for the use of survey data in this effort.
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Although estimates based on dietary intake data are useful for examining adequacy of nutrient intake in a population or subpopulation, and may be useful in identifying individuals at relative risk of developing nutrient deficiency, they cannot be used alone to determine the nutritional status of individuals or population groups. For these purposes, biomedical and clinical measures are necessary.
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The subcommittee suggests that priority be assigned to the development of improved estimates of mean nutrient requirement for nutrients that a substantial proportion of the population is consuming at levels less than the RDA. In the meantime, the subcommittee believes that the use of the probability approach will both stimulate and guide efforts to improve the validity and reliability of nutrient requirement estimates by permitting examination of the
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MAJOR CONCLUSIONS · The prevalence of inadequate intake can be estimated for many nutrients by the probability approach described in this report. For others, however, the method cannot be applied until research leads to a better understanding of both the average nutrient requirement and its variability, which are needed in probability analysis, and an ~mprovement in the reliability of food composition data.
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If the probability approach is adopted, the following suggestions should be considered when planning for future NFCS surveys: · Changes may be advisable in the design of food intake data collection. For example, the nether of 1-day food intake observations per subject might be reduced; it would be preferable to use the same data collection methods for each day of intake data; and it might be desirable to avoid sampling on adjacent days and to continue to sample on representative days of the week.
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The subcommittee believes that agencies responsible for the design and conduct of national or regional surveys would benefit from conducting analyses analogous to those discussed in this report, including full statistical consideration of the implication of design decisions on the precision and reliability of data analyses. ~ It is imperative that future surveys include questions on intake of dietary supplements as well as of foods.
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