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SCIENCE OF NUTRITION

SCIENCE OF NUTRITION. Science Study of nutrients in food How body uses nutrients. CAUSES OF DEATH. FACTORS. FOOD CHOICES. Personal preference Habit Ethnic heritage or tradition Social interaction Availability, convenience Positive, negative associations Emotions Values

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SCIENCE OF NUTRITION

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  1. SCIENCE OF NUTRITION • Science • Study of nutrients in food • How body uses nutrients

  2. CAUSES OF DEATH

  3. FACTORS

  4. FOOD CHOICES • Personal preference • Habit • Ethnic heritage or tradition • Social interaction • Availability, convenience • Positive, negative associations • Emotions • Values • Body weight and image • Nutrition

  5. NUTRIENTS • Obtained from food • Used in the body for: > regulating growth > maintaining body tissues > repairing body tissues

  6. SIX CLASSES OF NUTRIENTS • CARBOHYDRATES…….4 CAL/GRAM • PROTEIN…………………4 CAL/GRAM • FAT……………………….9 CAL/GRAM • VITAMINS • MINERALS • WATER • ALCOHOL = 7 CAL/GRAM

  7. ELEMENTS IN THE NUTRIENTS

  8. EVALUATION OF NUTRITION INFORMATION

  9. WHO SAID IT • Check credentials, background, education- degree of reliability • RD, LD • BS focus on science • 900 clinical hours • National registration exam • Licensure according to each state • Continuing education

  10. MOTIVE? • Scientific truth • Refereed journal • Reputable Professional Journals • Articles screened by panel of experts/peers • Sensationalism • Profit

  11. WHAT IS EXPERIENCE? • Human Nutrition? • Evidence Scientific studies • Testimonials NOT acceptable • Uncontrolled experiment NOT acceptable • Look at: Placebo effect Population studied Blind, double blind, random,

  12. BEWARE OF CLAIMS • Poor diet claimed as cause of most disease • Conspiracy of medical community • Normal foods are “bad” • Exaggerated promises

  13. RESPONSIBILITY • Author? • Publisher ? • Editor? • Bookstore owner? READER IS RESPONSIBLE!! THAT’S YOU!

  14. OBTAIN RELIABLE INFORMATION • American Medical Association • American Academy of Pediatrics • American Dietetic Association • American Heart Association • American Cancer Society • American Diabetes Association • Dairy and Nutrition Council

  15. GOVERNMENT • Local Health Department • Cooperative Extension Programs • National Academy of Sciences • FDA

  16. Role of Health Professional • Examine evidence – risk vs benefits • Give best advice based on scientific evidence • Don’t make promises • Food alone cannot make a person healthy • Keep open mind – update • Translate guidelines into food – what to eat, what to limit

  17. Dietary Reference Intakes • DRI committee • Develops framework for recommendations • Set of nutrient intake values for HEALTHY people in the US and Canada • Values are used for planning and assessing diets

  18. TERMS

  19. DRI - TERMS

  20. ESTIMATED AVERAGE REQUIREMENT • Amount of nutrient that will maintain specific biochemical or physiological function in half the people of given age and sex group • Criteria for each nutrient based on the role it performs – used to set RDA

  21. RECOMMENDED DIETARY ALLOWANCES • Recommended intake – NOT required, NOT minimum • Standards for good nutrition • Average daily amount of nutrient considered adequate to meet known nutrient needs of all HEALTHY PEOPLE

  22. RDAs • Designed for groups • Most nutrient levels higher than average • Divided into age groups, gender after age 10

  23. USES OF RDAs • Assess adequacy of diets • Plan diets for groups • Standard to evaluate nutritional status • Most appropriate for populations – individuals over a period of time

  24. SETTING RDAs

  25. ENERGY RDA

  26. NAÏVE VS ACCURATE VIEW

  27. RDAs - LIMITATIONS • No RDA for every nutrient • Food analyses differ • Not user friendly for public • No data for fiber, cholesterol, fat

  28. ADEQUATE INTAKE • Average amount of a nutrient that appears sufficient to maintain a specific criterion • Insufficient scientific data to establish EAR

  29. Tolerable Upper Intake Levels • Maximum daily amount of a nutrient that appears safe for most healthy people • Above this level may be toxic

  30. Dietary Guidelines 2005 • Adequate nutrients within calorie need • Weight management • Physical activity • Food groups to encourage • Fats • Carbohydrates • Sodium and potassium • Alcoholic beverages • Food safety

  31. KEY RECOMMENDATIONS • Within each category recommendations for specific populations

  32. FOOD GUIDE PYRAMID • Visual representation of USDAs Dietary Guidelines • Number of servings that are right for you depends on how many calories you need  age, gender, size, activity

  33. 2005 PYRAMID

  34. Food Composition Tables • Average nutrient values based on lab analysis of food samples • Advantages; convenient, cheap, available NUTRIENT DENSITY • Disadvantage: Limited data Uncommon or ethnic foods not included BIOAVAILABILITY – in a form body can use or available for use

  35. NUTRIENT DENSITY

  36. DIET BASICS • Variety • Moderation • Balance of intake and output • Guidelines for fat and carbohydrate • Below 1200 calories – can’t supply adequate micronutrients • Below 45 grams of protein – can’t supply essential amino acids

  37. Food Labels • Daily values- based on 2000 calories and current nutrition recommendations • Fat = <30% of total calories • Saturated Fat = <10% of total calories • CHO = 55-60% of total calories • Pro = 10 – 15% of total calories • Fiber = 12 grams/ 1000 calories

  38. Food Labels - Continued • Maximums : Total Fat Saturated Fat Cholesterol Sodium • Minimums Total Carbohydrates Fiber

  39. DAILY VALUES • To show how a food fits into daily pattern • Percent of nutrient or food component • 2000 calories for women, children up to age 11, and older adults • 2500 calories for men, pregnant women, children over 11 years of age

  40. DAILY VALUES • Watch total fat intake • Calories from fat / total kcals = if more than 30% or 1/3 “WARNING” • Required nutrients: vitamins A & C, Minerals: iron and calcium • Do DRVs apply to everyone?

  41. APPROVED CLAIMS • Calcium and osteoporosis • Fats and cancer • Saturated fats, cholesterol and heart disease • Fiber containing fruits, vegetables, and grains and cancer • Sodium and hypertension • Fruits and vegetables and cancer • Folate or folic acid and neural tube defects • Oat bran or oatmeal and reduced risk of heart disease

  42. FOOD LABELS • Mandatory vs voluntary statements on the label • Definition of terms

  43. LABEL DEFINITIONS

  44. LABEL DEFINITIONS

  45. Food Patterns • Food energy: 3500 cals (1909) 3800 cals (1994) /capita/day • Carbohydrates: > Percent of cals 57% (1909)52% (1994) > Drop in use of grains and white potatoes > Per capita consumption of sweeteners steadily increasing (aspartame ^ in 1981)

  46. Eating Patterns • Protein: > Sources changed – animal and plant equal in 1909, animal sources in 1994 > Red meat down, poultry up, fish up slightly > Shell egg consumption down used in pastas, etc > Use of dairy products down

  47. Eating Patterns • Fat: > Percent of calories: 32% in 190936% (1989)38%(1994) > Shift from animal to vegetable fat sources > Marked increase in low-fat and nonfat milk (54% decline in whole milk) • Vitamins – per capita consumption above RDA for A, C, E, thiamin, riboflavin, niacin, B6, B12, folate • Calcium-Levels peaked in 1946, still below RDA

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