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Nutritional sciences: from fundamentals to food PDF

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Dietary Reference Intakes (DRIs) The Dietary Reference Intakes (DRIs) include two sets of values that serve as goals for nutrient intake—Recommended Dietary Allowances (RDAs) and Adequate Intakes (AIs). The RDA reflects the average daily amount of a nutrient considered adequate to meet the needs of most healthy people. If there is insufficient evidence to determine an RDA, an AI is set. The DRIs also include a set of values called Tolerable Upper Intake Levels (ULs). The UL represents the maximum amount of a nutrient that appears safe for most healthy people to consume on a regular basis. Turn the page for a listing of the ULs for selected vitamins and minerals and the Acceptable Macronutrient Distribution Range (AMDR) values. Estimated Energy Requirements (EERs), Recommended Dietary Allowances (RDAs), and Adequate Intakes (AIs) for Water, Energy, and the Macronutrients LGirfeo-uSptage Refere(nkcge/ Bm2)MI Referecncm e (ihne)ight, Referekngc e( lbw)eight, WateraAI (L/day) EnergyE ERb (kcal/day)CarboRhyDdAr (atge/ day)Total fiAbI e(r g/day)Total faAtI (g/day) LinoleicA I a(cig/d day)LinolenAiI c (agc/iddcay)ProteiRn DA (g/day)dProteinR DA (g/kg/day) Males 0–6 mo — 62 (24) 6 (13) 0.7e 570 60 — 31 4.4 0.5 9.1 1.52 7–12 mo — 71 (28) 9 (20) 0.8f 743 95 — 30 4.6 0.5 11 1.2 1–3 yg — 86 (34) 12 (27) 1.3 1046 130 19 — 7 0.7 13 1.05 4–8 yg 15.3 115 (45) 20 (44) 1.7 1742 130 25 — 10 0.9 19 0.95 9–13 y 17.2 144 (57) 36 (79) 2.4 2279 130 31 — 12 1.2 34 0.95 14–18 y 20.5 174 (68) 61 (134) 3.3 3152h 130 38 — 16 1.6 52 0.85 19–30 y 22.5 177 (70) 70 (154) 3.7 3067h 130 38 — 17 1.6 56 0.8 31–50 y 22.5i 177 (70)i 70 (154)i 3.7 3067h 130 38 — 17 1.6 56 0.8 $51 y 22.5i 177 (70)i 70 (154)i 3.7 3067h 130 30 — 14 1.6 56 0.8 Females 0–6 mo — 62 (24) 6 (13) 0.7e 520 60 — 31 4.4 0.5 9.1 1.52 7–12 mo — 71 (28) 9 (20) 0.8f 676 95 — 30 4.6 0.5 11 1.2 1–3 yg — 86 (34) 12 (27) 1.3 992 130 19 — 7 0.7 13 1.05 4–8 yg 15.3 115 (45) 20 (44) 1.7 1642 130 25 — 10 0.9 19 0.95 9–13 y 17.4 144 (57) 37 (81) 2.1 2071 130 26 — 10 1.0 34 0.95 14–18 y 20.4 163 (64) 54 (119) 2.3 2368 130 26 — 11 1.1 46 0.85 19–30 y 21.5 163 (64) 57 (126) 2.7 2403j 130 25 — 12 1.1 46 0.8 31–50 y 21.5i 163 (64)i 57 (126)i 2.7 2403j 130 25 — 12 1.1 46 0.8 $51 y 21.5i 163 (64)i 57 (126)i 2.7 2403j 130 21 — 11 1.1 46 0.8 Pregnancy 14–18 y 3.0 10 175 28 — 13 1.4 71 1.1 19–30 y 3.0 1340 175 28 — 13 1.4 71 1.1 31–50 y 3.0 1452 175 28 — 13 1.4 71 1.1 Lactation 1st 6 months postpartum 3.8 1330 210 29 — 13 1.3 71 1.3 2nd 6 months postpartum 3.8 1400 210 29 — 13 1.3 71 1.3 Note: For all nutrients, values for infants are AIs. Dashes indicate that values have not been cThe linolenic acid referred to in this table and text is the omega-3 fatty acid known as determined. alpha-linolenic acid. aThe water AI includes drinking water, water in beverages, and water in foods; in general, dThe values listed are based on reference body weights. drinking water and other beverages contribute about 70 to 80%, and foods, the r emainder. eAssumed to be from human milk. Conversion factors: 1 L 5 33.8 fluid oz; 1 L 5 1.06 qt; 1 cup 5 8 fluid oz. fAssumed to be from human milk and complementary foods and beverages. This includes bThe Estimated Energy Requirement (EER) represents the average dietary energy intake that approximately 0.6 L (~3 cups) as total fluid including formula, juices, and drinking water. will maintain neutral energy balance in a healthy person of a given sex, age, weight, height, gFor energy, the age groups for young children are 1–2 years and 3–8 years. and physical activity level. The values listed are based on an “active” person at the reference hFor males, subtract 10 kilocalories per day for each year of age above 19. height and weight and at the midpoint ages for each group until age 19. Chapter 2 and iBecause weight need not change as adults age if activity is maintained, reference weights Appendix B provide equations and tables to determine Estimated Energy Requirements. for adults 19 through 30 are applied to all adult age groups. jFor females, subtract 7 kilocalories per day for each year of age above 19. SOURCE: Adapted from the Dietary Reference Intakes series, National Academies Press. Copyright 1997, 1998, 2000, 2001, 2002, 2004, 2005, 2011 by the National Academy of Sciences. Recommended Dietary Allowances (RDAs) and Adequate Intakes (AIs) for Vitamins d LGirfeo-uSptage ThiamiRn DA (mg/dRaiyb)oflaRviDnA (mg/dNaiya)cin RDA (mg/dBaiyo)tain AI (mg/day)PantotAhI e(nimc ga/cdiayV)itamiRn DBA (6mg/dFaoyl)ate RDA (mg/daViyt)bamiRn DBA (m12g/daCyh)olinAeI (mg/day)VitamiRn DCA (mg/dVaiyt)amiRn DA A (mg/daViyt)camiRn DDA (mg/daViyt)damiRn DE A (mg/dVaity)aemiAnI (Km g/day) Infants 0–6 mo 0.2 0.3 2 5 1.7 0.1 65 0.4 125 40 400 10 4 2.0 7–12 mo 0.3 0.4 4 6 1.8 0.3 80 0.5 150 50 500 10 5 2.5 Children 1–3 y 0.5 0.5 6 8 2 0.5 150 0.9 200 15 300 15 6 30 4–8 y 0.6 0.6 8 12 3 0.6 200 1.2 250 25 400 15 7 55 Males 9–13 y 0.9 0.9 12 20 4 1.0 300 1.8 375 45 600 15 11 60 14–18 y 1.2 1.3 16 25 5 1.3 400 2.4 550 75 900 15 15 75 19–30 y 1.2 1.3 16 30 5 1.3 400 2.4 550 90 900 15 15 120 31–50 y 1.2 1.3 16 30 5 1.3 400 2.4 550 90 900 15 15 120 51–70 y 1.2 1.3 16 30 5 1.7 400 2.4 550 90 900 15 15 120 .70 y 1.2 1.3 16 30 5 1.7 400 2.4 550 90 900 20 15 120 Females 9–13 y 0.9 0.9 12 20 4 1.0 300 1.8 375 45 600 15 11 60 14–18 y 1.0 1.0 14 25 5 1.2 400 2.4 400 65 700 15 15 75 19–30 y 1.1 1.1 14 30 5 1.3 400 2.4 425 75 700 15 15 90 31–50 y 1.1 1.1 14 30 5 1.3 400 2.4 425 75 700 15 15 90 51–70 y 1.1 1.1 14 30 5 1.5 400 2.4 425 75 700 15 15 90 .70 y 1.1 1.1 14 30 5 1.5 400 2.4 425 75 700 20 15 90 Pregnancy 14–18 y 1.4 1.4 18 30 6 1.9 600 2.6 450 80 750 15 15 75 19–30 y 1.4 1.4 18 30 6 1.9 600 2.6 450 85 770 15 15 90 31–50 y 1.4 1.4 18 30 6 1.9 600 2.6 450 85 770 15 15 90 Lactation 14–18 y 1.4 1.6 17 35 7 2.0 500 2.8 550 115 1200 15 19 75 19–30 y 1.4 1.6 17 35 7 2.0 500 2.8 550 120 1300 15 19 90 31–50 y 1.4 1.6 17 35 7 2.0 500 2.8 550 120 1300 15 19 90 Note: For all nutrients, values for infants are AIs. cVitamin A recommendations are expressed as retinol activity equivalents (RAE). aNiacin recommendations are expressed as niacin equivalents (NE), except for recommenda- dVitamin D recommendations are expressed as cholecalciferol. tions for infants younger than 6 months, which are expressed as preformed niacin. eVitamin E recommendations are expressed as a-tocopherol. bFolate recommendations are expressed as dietary folate equivalents (DFE). Recommended Dietary Allowances (RDAs) and Adequate Intakes (AIs) for Minerals LGirfeo-uSptage Sodiu mA I (mg/dayC)hlori dAeI (mg/da yP)otass iAuI (m mg/dayC)alciu Rm DA (mg/dPahyo)sp hRoDrAu s( mg/dMaay)gn eRsiDuA m( mg/ Idraoy)n RDA (mg/ dZianyc) RDA (mg/ Idoaydi)n e RDA (mg/d Saeyl)eni RuDm A (mg/dCaoy)ppe rR DA (mg/ daMya)ng aAIn e(sem g/daFyl)uori dAeI (mg/dayC)hro miAIu (mm g/da y)Molyb RdeDnA u(mm g/day) Infants 0–6 mo 120 180 400 200 100 30 0.27 2 110 15 200 0.003 0.01 0.2 2 7–12 mo 370 570 700 260 275 75 11 3 130 20 220 0.6 0.5 5.5 3 Children 1–3 y 1000 1500 3000 700 460 80 7 3 90 20 340 1.2 0.7 11 17 4–8 y 1200 1900 3800 1000 500 130 10 5 90 30 440 1.5 1 15 22 Males 9–13 y 1500 2300 4500 1300 1250 240 8 8 120 40 700 1.9 2 25 34 14–18 y 1500 2300 4700 1300 1250 410 11 11 150 55 890 2.2 3 35 43 19–30 y 1500 2300 4700 1000 700 400 8 11 150 55 900 2.3 4 35 45 31–50 y 1500 2300 4700 1000 700 420 8 11 150 55 900 2.3 4 35 45 51–70 y 1300 2000 4700 1000 700 420 8 11 150 55 900 2.3 4 30 45 .70 y 1200 1800 4700 1200 700 420 8 11 150 55 900 2.3 4 30 45 Females 9–13 y 1500 2300 4500 1300 1250 240 8 8 120 40 700 1.6 2 21 34 14–18 y 1500 2300 4700 1300 1250 360 15 9 150 55 890 1.6 3 24 43 19–30 y 1500 2300 4700 1000 700 310 18 8 150 55 900 1.8 3 25 45 31–50 y 1500 2300 4700 1000 700 320 18 8 150 55 900 1.8 3 25 45 51–70 y 1300 2000 4700 1200 700 320 8 8 150 55 900 1.8 3 20 45 .70 y 1200 1800 4700 1200 700 320 8 8 150 55 900 1.8 3 20 45 Pregnancy 14–18 y 1500 2300 4700 1300 1250 400 27 12 220 60 1000 2.0 3 29 50 19–30 y 1500 2300 4700 1000 700 350 27 11 220 60 1000 2.0 3 30 50 31–50 y 1500 2300 4700 1000 700 360 27 11 220 60 1000 2.0 3 30 50 Lactation 14–18 y 1500 2300 5100 1300 1250 360 10 13 290 70 1300 2.6 3 44 50 19–30 y 1500 2300 5100 1000 700 310 9 12 290 70 1300 2.6 3 45 50 31–50 y 1500 2300 5100 1000 700 320 9 12 290 70 1300 2.6 3 45 50 Tolerable Upper Intake Levels (ULs) for Vitamins LGirfeo-uSptage Niacin ( mg/day)aVitami(n mBg/d6ay)Folate (mg/day)aCholin(e mg/day)Vitami(n mCg /day)Vitami(mn gA /day)bVitami(mn gD /day)Vitami(n mE g/day)c Infants 0–6 mo — — — — — 600 25 — 7–12 mo — — — — — 600 38 — Children 1–3 y 10 30 300 1000 400 600 63 200 4–8 y 15 40 400 1000 650 900 75 300 Adolescents 9–13 y 20 60 600 2000 1200 1700 100 600 14–18 y 30 80 800 3000 1800 2800 100 800 Adults 19–70 y 35 100 1000 3500 2000 3000 100 1000 .70 y 35 100 1000 3500 2000 3000 100 1000 Pregnancy 14–18 y 30 80 800 3000 1800 2800 100 800 19–50 y 35 100 1000 3500 2000 3000 100 1000 Lactation 14–18 y 30 80 800 3000 1800 2800 100 800 19–50 y 35 100 1000 3500 2000 3000 100 1000 aThe UL for niacin and folate apply to synthetic forms bThe UL for vitamin A applies to the preformed vitamin only. obtained from supplements, fortified foods, or a cThe UL for vitamin E applies to any form of supplemental combination of the two. a-tocopherol, fortified foods, or a combination of the two. Tolerable Upper Intake Levels (ULs) for Minerals m LGirfeo-uSptage Sodiu(m mg/day)Chlori(dem g/day)Calciu(m mg/day)Phosp(homrgu/s day)Magn(esimug/m day)dIron (mg/day)Zinc (mg/day)Iodine (mg/day)Seleni(ummg /day)Coppe(rm g/day)Manga(nmegs/e day)Fluorid(e mg/day)Molyb(mdegn/uday)Boron (mg/day)Nickel (mg/day) Infants 0–6 mo —e —e 1000 — — 40 4 — 45 — — 0.7 — — — 7–12 mo —e —e 1500 — — 40 5 — 60 — — 0.9 — — — Children 1–3 y 1500 2300 2500 3000 65 40 7 200 90 1000 2 1.3 300 3 0.2 4–8 y 1900 2900 2500 3000 110 40 12 300 150 3000 3 2.2 600 6 0.3 Adolescents 9–13 y 2200 3400 3000 4000 350 40 23 600 280 5000 6 10 1100 11 0.6 14–18 y 2300 3600 3000 4000 350 45 34 900 400 8000 9 10 1700 17 1.0 Adults 19–70 y 2300 3600 2500f 4000 350 45 40 1100 400 10,000 11 10 2000 20 1.0 .70 y 2300 3600 2000 3000 350 45 40 1100 400 10,000 11 10 2000 20 1.0 Pregnancy 14–18 y 2300 3600 3000 3500 350 45 34 900 400 8000 9 10 1700 17 1.0 19–50 y 2300 3600 2500 3500 350 45 40 1100 400 10,000 11 10 2000 20 1.0 Lactation 14–18 y 2300 3600 3000 4000 350 45 34 900 400 8000 9 10 1700 17 1.0 19–50 y 2300 3600 2500 4000 350 45 40 1100 400 10,000 11 10 2000 20 1.0 dThe UL for magnesium applies to synthetic forms obtained from supplements or drugs only. SOURCE: Adapted with permission from the Dietary Reference Intakes series, National Academies eSource of intake should be from human milk (or formula) and food only. Press. Copyright 1997, 1998, 2000, 2001, 2011, by the National Academy of Sciences. Courtesy of fThe UL for calcium for 19–50 y is 2500 mg; the UL for calcium is reduced to 2000 mg for 51–70 y. the National Academies Press, Washington, D.C. Note: An Upper Limit was not established for vitamins and minerals not listed and for those age groups listed with a dash (—) because of a lack of data, not because these nutrients are safe to consume at any level of intake. All nutrients can have adverse effects when intakes are excessive. Acceptable Macronutrient Distribution Ranges (AMDRs) Range (percent of energy) Children, Children, Adults Macronutrient 1–3 years 4–18 years 191 years Fat 30–40 25–35 20–35 v-6 polyunsaturated acidsa 5–10 5–10 5–10 (linoleic acid) v-3 polyunsaturated fatty acidsa 0.6–1.2 0.6–1.2 0.6–1.2 (linolenic acid) Carbohydrate 45–65 45–65 45–65 Protein 5–20 10–30 10–35 aApproximately 10% of the total can come from longer-chain v-3 or v-6 fatty acids. SOURCE: Adapted from Institute of Medicine, Dietary Reference Intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids, National Academies Press; Washington, D.C., 2005. This page intentionally left blank This is an electronic version of the print textbook. Due to electronic rights restrictions, some third party content may be suppressed. Editorial review has deemed that any suppressed content does not materially affect the overall learning experience. The publisher reserves the right to remove content from this title at any time if subsequent rights restrictions require it. For valuable information on pricing, previous editions, changes to current editions, and alternate formats, please visit www.cengage.com/highered to search by ISBN#, author, title, or keyword for materials in your areas of interest. THIRD EDITION Nutritional Sciences FROM FUNDAMENTALS TO FOOD Michelle McGuire, PhD Washington State University Kathy A. Beerman, PhD Washington State University Australia • Brazil • Japan • Korea • Mexico • Singapore • Spain • United Kingdom • United States Nutritional Sciences: From Fundamentals © 2013, 2011 Wadsworth, Cengage Learning to Food, Third Edition ALL RIGHTS RESERVED. No part of this work covered by the copyright Michelle McGuire and Kathy A. Beerman herein may be reproduced, transmitted, stored, or used in any form Publisher: Yolanda Cossio or by any means graphic, electronic, or mechanical, including but not limited to photocopying, recording, scanning, digitizing, taping, Web Senior Acquisitions Editor: Peggy Williams distribution, information networks, or information storage and retrieval Developmental Editor: Suzannah Alexander systems, except as permitted under Section 107 or 108 of the 1976 Assistant Editor: Elesha Feldman United States Copyright Act, without the prior written permission of the publisher. Editorial Assistant: Sean Cronin Media Editor: Miriam Myers For product information and technology assistance, contact us at Senior Marketing Manager: Laura McGinn Cengage Learning Customer & Sales Support, 1-800-354-9706. Senior Marketing Communications For permission to use material from this text or product, Manager: Linda Yip submit all requests online at www.cengage.com/permissions. Marketing Coordinator: Jing Hu Further permissions questions can be e-mailed to [email protected]. Senior Content Project Manager: Carol Samet Library of Congress Control Number: 2011925356 Creative Director: Rob Hugel Art Director: John Walker ISBN-13: 978-0-8400-5820-1 Print Buyer: Karen Hunt ISBN-10: 0-8400-5820-9 Rights Acquisitions Specialist: Tom McDonough Wadsworth Production Service: Lynn Lustberg, 20 Davis Drive MPS Limited, a Macmillan Company Belmont, CA 94002-3098 USA Text Designer: Ellen Pettengell Photo Researcher: Josh Garvin, Bill Smith Group Cengage Learning is a leading provider of customized learning solutions with office locations around the globe, including Singapore, the United Copy Editor: Laurene Sorensen Kingdom, Australia, Mexico, Brazil, and Japan. Locate your local office at Cover Designer: Ellen Pettengell www.cengage.com/global. Cover Image: Gettyimages Compositor: MPS Limited, a Macmillan Cengage Learning products are represented in Canada by Nelson Company Education, Ltd. To learn more about Wadsworth visit www.cengage.com/Wadsworth Purchase any of our products at your local college store or at our preferred online store www.CengageBrain.com. Printed in the United States of America 1 2 3 4 5 6 7 14 13 12 11 CONTENTS IN BRIEF CHAPTER 1 The Science of Nutrition 3 CHAPTER 2 Nutritional Assessment and Dietary Planning 31 CHAPTER 3 Chemical, Biological, and Physiological Aspects of Nutrition 69 CHAPTER 4 Carbohydrates 113 Nutrition Matters Nutrition and Diabetes 147 CHAPTER 5 Protein 161 Nutrition Matters Food Safety 199 CHAPTER 6 Lipids 217 Nutrition Matters Nutrition and Cardiovascular Health 254 CHAPTER 7 Energy Metabolism 269 Nutrition Matters Alcohol, Health, and Disease 301 CHAPTER 8 Energy Balance and Body Weight Regulation 321 Nutrition Matters Disordered Eating 365 CHAPTER 9 Physical Activity and Health 385 CHAPTER 10 Water-Soluble Vitamins 417 CHAPTER 11 Fat-Soluble Vitamins 459 Nutrition Matters Nutrition and Cancer 489 CHAPTER 12 The Major Minerals and Water 505 Nutrition Matters Nutrition and Bone Health 540 CHAPTER 13 The Trace Minerals 553 CHAPTER 14 Life Cycle Nutrition 583 Nutrition Matters Food Security, Hunger, and Malnutrition 634 APPENDIXES A Aids to Calculation A-2 B Estimated Energy Requirement (EER) Calculations and Physical Activity Values (PA) A-4 C Summary of the 2010 Dietary Guidelines for Americans A-6 D The Exchange System A-7 E Answers to Study Card Review Questions A-22 Glossary G-1 Index I-1 iii CONTENTS CHAPTER 1 The Science of Nutrition 3 Everybody Has a Story Choosing Nutrition as a Career Path 4 Observation 13 • Step 3: Data Are Collected to What Do We Mean by “Nutrition”? 5 Test the Hypothesis 15 • Intervention Studies Test for Causality 16 Nutrients Support All We Do 5 • Foods Contain Nutrients and Nonnutrients 5 • Organic Nutrients Are Different from Are All Nutrition Claims Believable? 19 Organic Foods 6 Determine the Source of the Information 20 • Focus on Food Understanding What Is Meant Credibility of the Researchers Is Important 21 • by “Organic Foods” 7 Who Paid for the Research? 21 • Evaluate the Phytochemicals, Zoonutrients, and Functional Foods 7 Experimental Design 21 • Do Public Health Organizations Concur? 21 What Are the Major Nutrient Classes? 8 Nutrition and Health: What Is the Connection? 22 Carbohydrates Are Vital for Energy and Regulatory Public Health Agencies Assess the Health of the Roles 8 • Proteins Make Up Muscles and Are Important for Energy and Regulation 9 • Lipids Are More Than Nation 22 • Mortality and Morbidity Rates Measure Abundant Energy Sources 9 • Water Is the Essence of Death and Illness Over Time 22 • Life Expectancy Has Life Itself 9 • Vitamins Regulate Reactions and Promote Increased Dramatically 23 • Diseases Are Either Infectious Growth and Development 9 • Minerals Provide Structure or Noninfectious 24 • Chronic Diseases Are the Leading and Assist with Regulation 10 Causes of Death 24 • Risk Factors Do Not Necessarily Cause Chronic Diseases 26 • Understanding Nutrition Is How Do Foods Provide Energy? 10 More Important Than Ever 26 Energy in Food Is Measured in Units Called Calories 11 Focus on Diet and Health Industrialization, Population How Is Nutrition Research Conducted? 13 Growth, and the Nutrition Transition 27 Step 1: The Observation Must Be Accurate 13 • Step 2: A Hypothesis Makes Sense of an CHAPTER 2 Nutritional Assessment and Dietary Planning 31 Everybody Has a Story Nutrient Deficiencies—Primary or for Individuals 42 • Adequate Intake (AI) Levels Were Secondary? 32 Set When Data Were Lacking for EARS 43 • Tolerable Upper Intake Levels (ULs) Reflect Safe Maximal What Do We Mean by “Nutritional Status”? 33 Intakes 43 • Energy Intake Can Also Be Evaluated 44 Primary and Secondary Malnutrition Can Lead to Poor Nutritional Status 33 • Adequate Nutrient Intake Can Be How Can You Easily Assess and Plan Your Diet? 46 Different Among Individuals 34 Food Guidance Systems Have Been Part of Dietary Planning for Decades 47 How Is Nutritional Status Assessed? 34 Anthropometry: Body Measurements Provide Information 2010 Dietary Guidelines for Americans: Our Concerning Nutritional Status 34 • Laboratory Tests Current Recommendations 48 Are Important Biochemical Indicators of Nutritional Balance Calories to Manage Weight 49 • Reduce Certain Status 35 • Clinical Evaluations Assess Signs and Foods and Food Components 50 • Increase Certain Foods Symptoms of Disease 36 • Analysis of Your Diet Can Also and Nutrients 50 Be Helpful 36 • Food Composition Tables and Dietary Food Matters Working Toward the Goal: Maximizing Nutrient Analysis Software Are Important Tools 37 Intake by Increasing Fruit and Vegetable Intake 51 How Much of a Nutrient Is Adequate? 38 Build Healthy Eating Patterns 51 • Helping Americans Dietary Reference Intakes (DRIS) Provide Reference Make Healthy Choices 53 • MyPlate Illustrates How to Put Standards 38 • DRI Values Depend on Many Recommendations into Practice 54 • Healthy People 2020 Factors 40 • Estimated Average Requirements (EARs) Outlines Our Nation’s Goals for Healthy Living 56 Reflect a Population’s Average Need 41 • Recommended How Can You Use Food Labels to Plan a Healthy Diet? 58 Dietary Allowances (RDAs) Are Recommended Intake Goals Understanding Nutrition Facts Panels 58 iv

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