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Mypyramid Food Intake Pattern Modeling for the Dietary Guidelines Advisory Committee

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REPORT MyPyramid Food Intake Pattern Modeling for the Dietary Guidelines Advisory Committee Patricia Britten, PhD1; Joan Lyon, MS, RD1; Connie M. Weaver, PhD2; Penny M. Kris-Etherton, PhD3; Theresa A. Nicklas, DrPH4; Jennifer A. Weber, MPH, RD5; Carole A. Davis, MS, RD1 ABSTRACT Modeling analyses using the MyPyramid intake patterns were conducted in collaboration with the 2005 Dietary Guidelines Advisory Committee in response to their research questions and to determine likely effects of possible recommendations on overall dietary adequacy. Scenarios modeled included the feasibility of using the food patterns for lacto-ovo-vegetarian diets, of varying fat levels within the patterns, and of increasing dietary flexibility through food group substitutions. Food pattern modeling was a useful tool to identify possible impacts on diet quality of potential Dietary Guidelines recommendations. Modeling analyses can help researchers explore the overall effect of specific dietary recommendations on intake patterns. Key Words: MyPyramid, Dietary Guidelines for Americans, food intake patterns, dietary guidance (J Nutr Educ Behav. 2006;38:S143-S152) INTRODUCTION among the Dietary Guidelines Advisory Committee (DGAC) as a whole, individual subcommittees, and federal In January 2005, the U.S. Departments of Agriculture staff from USDA and HHS. Several collaborative sessions (USDA) and Health and Human Services (HHS) jointly took place during the DGAC’s 5 formal meetings, which released the Dietary Guidelines for Americans (Dietary were open to the public. Table 1 shows a brief side-by-side Guidelines), which form the basis of federal food and nu- timeline of the 2 development processes and key points of trition policy. Shortly thereafter, USDA released the My- collaboration. Pyramid Food Guidance System (MyPyramid). MyPyramid The 2005 DGAC was charged to critically review sci- is a system of food patterns and interactive nutrition edu- entific evidence relating diet and physical activity to health cation tools and materials designed to help Americans across the lifespan (excluding infancy) and make recom- implement the Dietary Guidelines. MyPyramid’s food in- mendations to the secretaries of USDA and HHS concern- take patterns were developed through an iterative process ing the 2005 edition of the Dietary Guidelines for Americans. of modifying suggested intake levels from each food group The DGAC’s evaluation extended beyond the dietary con- to meet established nutritional goals for nutrient adequacy cerns of “strictly healthy persons” because increasing num- and moderation. The process has been described in detail in bers of Americans have chronic health problems such as accompanying articles.1,2 obesity, high blood pressure, and abnormal blood lipid The Dietary Guidelines and MyPyramid development values.3 To accomplish its mission, the DGAC developed processes occurred simultaneously, with collaboration and prioritized a large number of research questions and formed subcommittees to tackle key topic areas such as carbohydrates, energy, fats, fluid and electrolytes, ethanol, 1USDA Center for Nutrition Policy and Promotion, Alexandria, VA 2Purdue University, Department of Foods and Nutrition, West Lafayette, IN food safety, macronutrients, and nutrient adequacy. The 3The Pennsylvania State University, Department of Nutritional Sciences, University subcommittees conducted extensive, systematic literature Park, PA searches, prepared summary tables, analyzed national data 4Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine, Houston, TX sets, modeled food patterns, developed scientific rationales, 5American Dietetic Association, formerly with HHS Office of Disease Prevention and drafted conclusive statements. Their body of work was and Health Promotion, Rockville, MD presented to the full DGAC for review and discussion.3,4,5 Address for correspondence: Patricia Britten, PhD, USDA Center for Nutrition Following extensive deliberations on each key topic Policy and Promotion, 3101 Park Center Drive, Room 1034, Alexandria, VA 22302; Phone: (703) 305-7600; Fax: (703) 305-3300; E-mail: Patricia.Britten@cnpp. area, the DGAC developed a report, which presented its usda.gov. findings as an integrated set of conclusions and dietary PUBLISHED BY ELSEVIER INC. ON BEHALF OF THE SOCIETY FOR NUTRITION EDUCATION guidance recommendations for the general American pub- doi: 10.1016/j.jneb.2006.08.004 lic.3 The DGAC report served as the basis for the 2005 S144 Britten et al/MYPYRAMID FOOD INTAKE PATTERN MODELING FOR THE DIETARY GUIDELINES ADVISORY COMMITTEE Table 1. Side-by-side Timelines for Development of 2005 Dietary Guidelines for Americans and MyPyramid Food Guidance System MyPyramid Food Guidance System Dietary Guidelines for DateAmericans 2005 Technical Update Consumer Presentation Sep 03 First Dietary Guidelines Federal Register notice of proposed food Advisory Committee (DGAC) intake patterns requested peer review and meeting in Washington, DC public comment7 Jan 04 Second DGAC meeting Proposed food intake patterns and public included oral testimony comments discussed with Federal partners from the public and (USDA and HHS) and with 2005 DGAC presentations from invited experts Mar – May 04 Third and fourth DGAC Food pattern modeling to analyze the Developed concept for a new meetings impacts of potential DGAC subcommittee system approach to the recommendations on overall diet quality consumer presentation of food guide Aug 04 Fifth and final DGAC meeting Finalized food intake patterns Federal Register notice requested public comments on the proposed “Food Guidance System” consumer presentation Sep 04 DGAC presented its advisory Food intake patterns and reports of each Developed prototype report to the secretaries of modeling analysis included in DGAC report consumer awareness, USDA and DHHS, with motivational and recommendations for the educational materials 2005 Dietary Guidelines Oct 04 Federal Register notice solicited public comment on the DGAC report Oct – Dec 04 Departments drafted DG Updated final food intake patterns using Tested and revised prototype policy document based on USDA’s SR17 nutrient database and ’99-00 consumer materials the DGAC report NHANES data Jan 05 USDA and HHS jointly Food intake patterns included in appendix to published and released the DG policy document sixth edition of the Dietary Guidelines for Americans Apr 05 USDA released MyPyramid Food Guidance System Dietary Guidelines for Americans, which was jointly devel- modification to test various dietary recommendation sce- oped and published by USDA and HHS in January 2005.6 narios. Early in their deliberations, DGAC members re- One of the DGAC’s overarching goals was to evaluate quested that CNPP staff undertake food pattern modeling and synthesize the science regarding many individual nu- and analyses to evaluate the impact of potential recommen- trients and food components and develop recommenda- dations on diet quality. Subcommittees’ specific requests tions for an overall pattern of eating that could be adopted included developing a lacto-ovo-vegetarian food pattern by the public.3 The food intake patterns that were in the that met nutrient goals; comparing the nutrient contribu- process of being developed by the USDA Center for Nu- tions of whole fruit with those of 100% fruit juices; assessing trition Policy and Promotion (CNPP) for the MyPyramid the adequacy of patterns with varying levels of fat; and Food Guidance System7 provided one such solution. These identifying the impact of recommending a specified amount patterns, designed to integrate Institute of Medicine (IOM) of fish per week. The subcommittees also sought to increase nutrient recommendations into food-based recommenda- the flexibility of some aspects of the food intake patterns, tions, included nutritional goals consistent with the recom- while achieving recommended nutrient intakes.4,5 Enhanc- mendations under consideration for the Dietary Guidelines. ing flexibility was considered important for a variety of The patterns also had a structure that allowed for their reasons, such as accommodating cultural food choices, in- Journal of Nutrition Education and Behavior ● Volume 38, Number 6S, November/December 2006 S145 dividual preferences, food cost, and availability. Iterations (The term “dry beans” is used in this manuscript to repre- of food pattern analyses and modeling exercises built on the sent all legumes, including dry beans, dry peas, and soybean previous ones; and all of the analyses were considered in the products.) The nutrients that can be expected from eating context of the total diet.1 foods in this group (the nutrient profile) are calculated The complete set of food pattern modeling analyses is assuming an intake of foods within the group that is pro- published in Appendix G-2 of the Report of the Dietary portionate to the distribution of foods in the group con- Guidelines Advisory Committee on the Dietary Guidelines for sumed by the population (Table 2). The DGAC was inter- Americans, 2005.3 The MyPyramid Food Guidance System ested in exploring if the food intake patterns were was finalized after the release of the Dietary Guidelines. appropriate for consumers choosing vegetarian diets. They This finalization allowed CNPP to incorporate the Dietary requested an analysis of the adequacy of the food intake Guidelines recommendations into the education materials patterns if no meat, poultry, or fish were consumed. and to refine the food intake patterns using the
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