introduction to nutrition
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Introduction to Nutrition. Chapter 1. Objectives. After reading Chapter 1, class activities and discussion you will be able to Define frequently used terms Identify factors affecting food choices Discuss six major nutrient classes Describe D ietary R eference I ntakes - PowerPoint PPT PresentationTRANSCRIPT
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Introduction Introduction to Nutritionto Nutrition
Chapter 1Chapter 1
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ObjectivesObjectives• After reading Chapter 1, class activities
and discussion you will be able to– Define frequently used terms– Identify factors affecting food choices– Discuss six major nutrient classes– Describe Dietary Reference Intakes– Describe ABCD’s of diet planning principles
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ObjectivesObjectives• After reading Chapter 1, class activities
and discussion you will be able to: – Distinguish energy density of foods– Distinguish food’s nutrient density – Identify the energy value of carbohydrate,
protein, and fat– Calculate the energy available from foods
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Food ChoicesFood Choices
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Factors Influencing What You EatFactors Influencing What You Eat
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Factors Influencing What You EatFactors Influencing What You Eat
• The most important consideration when choosing something to eat is flavor!flavor!
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Factors Influencing What You EatFactors Influencing What You Eat• Flavor
– Taste– Smell– Appearance– Temperature– Texture
• Other Factors– Cost– Convenience– Availability– Familiarity– Nutritional Value
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How Taste Influences What You How Taste Influences What You EatEato Flavor of food is
recognized by theo Sense of tasteo Sense of Smell
o Flavorous chemicals must be dissolved in water before they can be tasted
o Dry mouth prevents adequate tasting
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How Taste Influences What You How Taste Influences What You EatEato 10,000 taste buds; 4 main
types:o Sweet, Sour, Salty, Bittero Umami, Piquant
o 50-150 receptor cells per taste bud
o 1-2 weeks cell lifeo Each receptor cell reflects
all flavors but more sensitive to one
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How Taste Influences What You How Taste Influences What You EatEat
o Origins of different tastes:o Sweet = Saccharin of sugaro Sour = Acido Salty = Salt, sodium chlorideo Bitter = Alkaloidso Umami, Piquant
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Factors Influencing What You EatFactors Influencing What You Eat
• Demographics– Age– Gender– Educational
level– Income
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Factors Influencing What You EatFactors Influencing What You Eat
• Social and Emotional Influences– Social status– Peer pressure– Emotional status– Food associations
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Factors Influencing What You EatFactors Influencing What You Eat• Food Industry and the
Media– Food industry
– Food advertising– Food portrayal in
media– Reporting of
nutrition/health studies
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Factors Influencing What You EatFactors Influencing What You Eat
• Environmental Concerns– Use of synthetic fertilizers
and pesticides– Wastefulness of fattening
up livestock/poultry
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Factors Influencing What You Eat
• Health– Health status– Desire to improve
health/appearance– Nutrition knowledge and attitudes
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What is Nutrition?
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What is What is Nutrition?Nutrition?Nutrition is a science that:studies nutrients and other substances in foods
and in the body and how these nutrients relate to health and disease, and
explores why you choose particular foods and the type of diet you eat.
science of foods and nutrients
1 q.p. 9
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NutrientsNutrients Nourishing
substances in food that provide energy and promote the growth and maintenance of your body.
p. 96. i
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NutrientsNutrients• Nutrient composition of foods and
the human body are similar• Nutrient composition of foods
–Six classes of nutrients –Nonnutrients
• Example: Phytochemicals • 7. j
» p. 222
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FoodsFoods• Derived from plant or animal
sources• Provide energy and nutrients
–Used by the body for maintenance, growth, and repair
–2 p
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DietDiet • The foods one consumes affects
• The quality of life now • The risk of chronic diseases later
– UC San Francisco study-Aug 2010» 3258 subjects 18-30 y.o.» Studied for 20 years » 5 ½ x more likely to develop CHD
• 3 op. 10
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Body CompositionBody Composition
60%
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Nutrients in the BodyNutrients in the Body • Nutrient composition of the body
–Water = 60%–Fat = 13-31%
• Male = 13 -21%• Female = 23 -31%
–Carbohydrate, Protein, Vitamins, Minerals, Other = 9 – 27%
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Nutrients in the BodyNutrients in the Body• Example: 150# body
– Water = 90#– Fat = 20 -45#– Carbohydrate, Protein, Major Minerals
= 15 -40#– Vitamin, Minor Minerals = < 1#
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More About NutrientsMore About Nutrients• Energy defined
– Capacity to do work– 5 h
• Nutrient defined– Growth– Maintenance
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Carbohydrates 4 kcal/gram
Lipids 9 kcal/gram
Protein 4 kcal/gram
p. 1217. a
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Functions of NutrientsFunctions of NutrientsNutrients Provide
EnergyPromote
GrowthMaintenance
Regulate Body
Processes
Carbohydrates X
Lipids X X XProteins X X XVitamins X X
Minerals X X
Water X X
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More About NutrientsMore About Nutrients• Chemical composition of nutrients
– Inorganic vs. Organic nutrients• Inorganic = contain NO carbon• Organic = contain carbon• Organic literally meaning “alive”
• 9 l• 10 m
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More About More About NutrientsNutrients
• Inorganic nutrients– Minerals -Water
• Organic nutrients– Carbohydrates -Lipids– Proteins -Vitamins
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The NutrientsThe Nutrients
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NutrientsNutrients• Essential nutrients (approx. 40)
– 11 f• Macronutrients -12. g
– Carbohydrates– Proteins– Fats
• Micronutrients– Vitamins– Minerals
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Essential NutrientsEssential Nutrients
Nutrients that either cannot be made in the body or cannot be made in the quantities needed by the body; therefore, we must obtain them through food.
EXAMPLESGlucose, vitamins, minerals, water, some lipids, and some parts of protein.
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Six Classes of Six Classes of Nutrients Nutrients
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Classes of Nutrients - OverviewClasses of Nutrients - Overview
• CarbohydratesCarbohydrates
• Lipids (fats)Lipids (fats)
• ProteinsProteins
• VitaminsVitamins
• MineralsMinerals
• WaterWater
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CarbohydratesCarbohydrates• A large class of
nutrients, including:– Sugars– Starch– Fibersthat function as thebody’s primarysource of energy.
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LipidsLipids• A group of fatty
substances, including triglycerides and cholesterol, that are not soluble in water and provide a rich source of energy and structure to cells.
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ProteinProtein• Major structural parts
of the body’s cells that are made of nitrogen-containing amino acids assembled in chains.
• Particularly rich in animal foods.
• Present in many plant foods.
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Vitamins and MineralsVitamins and Minerals• Vitamins: Noncaloric,
organic nutrients found in a wide variety of foods that are essential to:
– regulate body processes.
– maintain the body.– allow growth and
reproduction.– 15. c
• Minerals: Noncaloric, inorganic nutrients found in a wide variety of foods that are essential to:– regulate body processes.– maintain the body.– allow growth and
reproduction.– 16. b
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WaterWater• Inorganic nutrient that
plays a vital role in all bodily processes and makes up just over half of the body’s weight.
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Food FactsFood Facts• Most foods provide a mix
of nutrients.
• Food contains more than just nutrients – food may contain colorings, flavorings, phytochemicals, caffeine, and other substances.
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Nutrient Nutrient DensityDensity
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Nutrient DensityNutrient Density• All foods were not created equal in terms of the kcalories
and nutrients they provide.• Nutrient density: A measure of the nutrients provided in a
food per kcalorie of the food.• Empty-kcalorie foods: Foods that provide few/no nutrients for the number of kcalories they contain. 8. k p. 13-14
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Nutrient DensityNutrient Density• Which food item
has the greatest nutrient density?
• “NuVal”?
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Nutrient Density Comparison: % DRI intakes for selected nutrients.
p. 14
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Energy DensityEnergy Density• Energy Density
–A measure of the energy a food provides relative to the amount of food (kcal per gram) • “empty calories”• 14. d
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Energy DensityEnergy Density
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Nutritious DietNutritious Diet
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Characteristics of A Nutritious DietCharacteristics of A Nutritious Diet
• Adequate• Balanced• Moderate• Varied
p. 16
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Diet Planning PrinciplesDiet Planning Principles• AAdequacy-amounts sufficient to
maintain health• BBalance-foods proportionate to each
other and body’s needs• CControl-Kcalorie (energy)-food
energy intake management• Moderation: Enough but not too much
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Diet Planning PrinciplesDiet Planning Principles• DDensity: Caloric/Nutrient
–Empty-kilocalorie foods–Nutrient dense foods
• VARIETY!VARIETY!– Eating a wide selection– Whole foods
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Dietary Reference Intake (DRI)Dietary Reference Intake (DRI)
• Dietary Reference Intake: a set of values that serve as standards for nutrient intakes for healthy persons.
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Dietary Reference Intakes (DRI)Dietary Reference Intakes (DRI)
• Recommended Dietary AllowanceRecommended Dietary Allowance (RDA)(RDA)Intake value sufficient to meet Intake value sufficient to meet nutrient requirements of 97-98% of nutrient requirements of 97-98% of all healthy individuals in a group.all healthy individuals in a group.
• Adequate Intake (AI)Intake value used when a RDA cannot be based on an EAR because there’s not enough scientific data.
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Dietary Reference IntakesDietary Reference Intakes• Tolerable Upper Intake Level (UL)
Maximum intake level above which toxicity would increase. • Estimated Average Requirement (EAR)
Intake value estimated to meet requirement of half the healthy individuals in a group.
• Estimated Energy Requirement (EER)The dietary energy intake measured in kcalories that is needed to maintain energy balance in a healthy adult.
• Acceptable Macronutrient Distribution Ranges (AMDR)A range of intakes for a particular nutrient that is associated with reduced risk of chronic disease while providing adequate intake.– Adults: 45-65% of Kcal from carbohydrates– 25-35 % from fat– 10-36% from protein
p. 17
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Dietary Reference IntakesDietary Reference Intakes
• RDA and AI – useful in planning diets for individuals
• EAR - useful in planning diets for groups
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DRIDRI
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DRIDRI
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How does the How does the body get its body get its nutrients?nutrients?
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Digestion, Absorption, & MetabolismDigestion, Absorption, & Metabolism
• Digestion: Process by which food is broken down into its components in the gastrointestinal tract with the help of digestive enzymes.
• Absorption: The passage of digested nutrients through the walls of the intestines or stomach into the blood or lymph, where they are transported to the cells.
• Metabolism: All the chemical processes by which nutrients are used to support life, includes anabolism and catabolism.
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““Digestibility”Digestibility”• Digestibility: The amount of a food or nutrient that is
available for absorption after digestion.• NOT a set of symptoms associated with eating or
digestion.– Reflux symptoms
• “After taste”• Belching, burping• “Heartburn”• Regurgitation
– Intestinal gas formation– Upset stomach, “indigestion”– Nausea, vomiting, diarrhea
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Digestion of a Sandwich
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Digestion of a Sandwich
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The Fate of a Piece of Pizza……..
• Using the last two slides as a guide, write down what would happen to a piece of pizza in each part of the body.
• Work with your group of colleagues if you would like.
• Let your instructor know when you are done.
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More on FoodMore on Food
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Food BasicsFood Basics1. Whole foods – fresh, unprocessed2. Fresh foods – raw, no preservatives3. Processed foods – procedure applied:
• Canning, freezing, dehydrating, milling4. Enriched foods – nutrients replaced5. Fortified foods – nutrients added
p. 26-29
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More Food BasicsMore Food Basics
• Textured vegetable protein• Imitation foods (cheese, milk) • Food substitutes (egg)
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Functional FoodFunctional Food• Functional foods
• Provide health benefits beyond their nutrient contributions
• Ex. Whole foods, fortified foods, modified foods (engineered, designer)
– Calcium fortified orange juice– Margarine containing plant sterols– 4-n
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Organic FoodsOrganic Foods• Organic food is produced without using most:
– Conventional pesticides– Petroleum-based fertilizers or sewage sludge-based
fertilizers– Bioengineering– Ionizing radiation (irradiation)
• Organic farms must be inspected annually.• All organically-raised animals may not be given
hormones or antibiotics, and must have access to pasture.
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Labeling of Organic FoodsLabeling of Organic Foods
Courtesy of USDA
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ReviewReview
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ObjectivesObjectives• After reading Chapter 1, class activities
and discussion you will be able to– Define frequently used terms– Identify factors affecting food choices– Discuss six major nutrient classes– Describe Dietary Reference Intakes– Describe ABCD’s of diet planning principles
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ObjectivesObjectives• After reading Chapter 1, class activities
and discussion you will be able to: – Distinguish energy density of foods– Distinguish food’s nutrient density – Identify the energy value of carbohydrate,
protein, and fat– Calculate the energy available from foods
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