Dietary Reference Intakes Applications in Dietary Planning (2003) / Chapter Skim
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Appendix C: The Target Nutrient Density of a Single Food
Appendix C: The Target Nutrient Density of a Single Food
Pages 183-191
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From page 183... ...
The first step in determining intake of a diet composed of a single food (or of a mix of foocis with similar nutrient density is to obtain a target nutrient density of the food for each subgroup in the heterogeneous group. Given a distribution of usual energy intakes in the subgroup, what is the target density of the nutrient in the food so that the prevalence of nutrient inacloquacy in the subgroup is low?
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From page 184... ...
. Because reliable information to derive the distribution of nutrient density requirements when nutrient requirements and energy intakes are not inclepenclent is not available, this approach assumes independence.
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From page 185... ...
(In practice, the actual usual energy intake distributions would be used to construct the clistribution of nutrient requirements expressed as densities. However, the mean energy intakes and CV of energy intake used in this example closely correspond to those that would be obtained from an analysis of the 1994-1996 Continuing Survey of Food Intakes by Inclivicluals PARS, 19981.)
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From page 186... ...
. The usual energy intake distributions used in the example are hypothetical.
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From page 187... ...
In the case of boys age ci 14 to 18 years, the target vitamin C density in the food is 42.9 mg/1,000 kcal. To plan intakes of a single food in a heterogeneous group consisting of these two subgroups, the planner would provide a food with vitamin C of density at least 63.6 mg/1,000 kcal, the higher of the two target densities computed above.
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From page 188... ...
The symbol oc is used to denote the nutrient density, or units of the nutrient per 1,000 kcal. The percentile method attempts to provide an answer to the following question: Given a certain distribution of usual energy intakes, what is the target density, or, of the nutrient so that the prevalence of nutrient inacloquacy in the group is low, for example, 2.5 percent?
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From page 189... ...
· The symbol oc is the target density or concentration of the nutrient in 1,000 kcal of the food uncler consideration. Given a usual energy intake equal to y, the target usual intake of the nutrient is equal to oh.
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From page 190... ...
In the special case in which both the nutrient requirement and the energy intake distributions are normal, it is possible to derive an analytical expression for oc. SAS PROGRAM TO COMPUTE THE REQUIREMENT DISTRIBUTIONS EXPRESSED AS DENSITIES The program below was used to obtain the two density requirement distributions shown in Figure C-1.
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From page 191... ...
/ run; run; data temp; set one; if _n_ = 9700;, requirements a/ /~ boys: 97th percentile of density proc print data = temp; run; /* boys: print target density for single food *
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