chapter 007
TRANSCRIPT
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Williams' Basic Nutrition & Diet Therapy
Chapter 7
Vitamins
Copyright © 2013 Mosby, Inc., an imprint of Elsevier Inc. All rights reserved. 1
14th Edition
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Lesson 7.1: The Nature of Vitamins
Vitamins are noncaloric essential nutrients necessary for many metabolic tasks.
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Dietary Reference Intakes (p. 94)
Recommendations for nutrient intake by healthy population groups
Based on gender and age RDA: Recommended Dietary Allowance EAR: Estimated Average Requirement AI: Adequate Intake UL: Tolerable Upper Intake Level
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The Nature of Vitamins (p. 95)
Discovered while searching for cures for classic diseases Dr. James Lind and scurvy
• Sailors dying on long voyages without fresh food• Lemons and limes provided, no one became ill• British soldiers got the nickname, “limeys”
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The Nature of Vitamins (cont’d) (p. 95)
Dr. Frederich Hopkins of Cambridge University Two groups of rats Group 1: Fed synthetic mix of protein,
carbohydrate, fat, mineral salts, and water: All rats died
Group 2: Fed same ration but with purified milk: All rats grew normally
Proved that accessory factors are present in natural foods that are essential to life
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The Nature of Vitamins (cont’d) (p. 95)
Most vitamins were discovered in the first half of the 1900s
At first, scientists assigned letters of the alphabet to each vitamin A, C, D, E, K
This practice was abandoned in favor of more specific names based on structure and function Cobalamin, pyridoxine, choline
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Definition of Vitamins (p. 95)
It must be a vital, organic substance that is only necessary in extremely small amounts
It cannot be manufactured by the body in sufficient quantities to sustain life, so it must be supplied by diet
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General Functions of Vitamins(p. 95)
Metabolic tasks Components of coenzymes Antioxidants Components of hormones that affect gene
expression Component of light-sensitive rhodopsin molecule
(vitamin A)
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General Functions of Vitamins (cont’d) (p. 95)
Metabolism: enzymes and coenzymes Example: B vitamins are part of coenzymes
Coenzymes needed to perform certain functions, such as:
Glucose metabolism Protein metabolism Fatty acid metabolism
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General Functions of Vitamins (cont’d) (p. 96)
Tissue structure and protection (e.g., vitamin C)
Antioxidants to protect cells Prevention of deficiency diseases
Example: vitamin C prevents scurvy
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Vitamin Metabolism (p. 96)
Fat soluble Vitamins incorporated with absorbed fat and
transported by chylomicrons Best absorbed when eaten with fat May be stored for long periods
Water soluble Easily absorbed and transported by the portal
circulation Not stored, so must be eaten on regular basis
(exceptions: B12 and B6)
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Lesson 7.2: Fat-Soluble Vitamins
Certain health problems are related to inadequate or excessive vitamin intake.
Vitamins occur in a wide variety of foods packaged with the energy-yielding macronutrients (carbohydrate, fat, and protein).
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Vitamin A (Retinol) (p. 97)
Functions Vision Tissue strength and immunity Growth
Requirements Food forms and units of measure Body storage
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Vitamin A Food Forms (p. 98)
Food forms and units of measure Preformed vitamin A: animal sources Provitamin A: yellow, orange, or deep green fruits
or vegetables
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Vitamin A Deficiency and Toxicity (p. 98)
Deficiency disease Xerosis Xerophthalmia
Toxicity symptoms Hypervitaminosis A
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Vitamin A Food Sources (p. 98)
Food sources Preformed vitamin A: Fish liver oils, liver, egg yolk,
butter, cream, milk fat Beta-carotene: dark green leafy vegetables, dark
orange vegetables and fruits Stability: quick cooking with little water to
preserve
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Vitamin D (Calciferol) (p. 99)
Functions Absorption of calcium and phosphorus Bone mineralization
Requirements
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Vitamin D Deficiency and Toxicity (p. 101)
Deficiency disease Rickets Osteoporosis
Toxicity syndromes Infants and children susceptible
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Vitamin D (Calciferol) (cont’d)(p. 101)
Few good natural sources other than fatty fish Large portion of intake must come from fortified foods
(e.g., milk)
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Vitamin E (Tocopherol) (p. 102)
Functions Antioxidant to protect cell membranes Works with glutathione peroxidase as antioxidant
Requirements RDA for 14 and older is 15 mg/day
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Vitamin E Deficiency and Toxicity (p. 102)
Deficiency disease Hemolytic anemia in young infants Dietary deficiency is rare
Toxicity syndromes Excessive supplements can interfere with vitamin
K activity
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Vitamin E Food Sources (p. 103)
Food sources Best: vegetable oils Nuts, fortified cereal, avocado
Stability Unstable to heat and alkalis
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Vitamin K (p. 103)
Identified by Henrik Dam in 1929 Functions
Blood clotting: essential component of four clotting factors Bone development: five proteins in bone and cartilage
require vitamin K–dependent modifications
Requirements Intestinal bacteria synthesize a constant supply Insufficient evidence to establish RDA AI is 120 mcg/day for men and 90 mcg/day for women
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Vitamin K Deficiency and Toxicity (p. 105)
Deficiency disease: blood loss Uncommon Patients with a malabsorption syndrome Patients treated with antibiotic that kills intestinal
bacteria Routinely given to infants at birth because
deficient at gestation Toxicity symptoms
None observed
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Vitamin K Food Sources (p. 105)
Food sources Green, leafy vegetables Small amounts of phylloquinone from dairy
products, meats, fortified cereals, fruits, vegetables
Stability Fairly stable Sensitive to light and irradiation Stored in dark bottles
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Case Study
Mr. Jones is a 69-year-old male who takes an anticoagulant daily. He has been consuming a vegan diet by choice for the past 2 years.
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Case Study (cont’d)
Discuss the effect of anticoagulant medications on overall blood clotting and any vitamins involved in this process.
What nutritional advice should be given to Mr. Jones while on anticoagulant medication?
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Lesson 7.3: Water-Soluble Vitamins and Supplements
Certain health problems are related to inadequate or excessive vitamin intake.
Vitamins occur in a wide variety of foods packaged with the energy-yielding macronutrients (carbohydrate, fat, and protein).
The body uses vitamins to make coenzymes required for some enzymes to function.
The need for particular vitamin supplements depends on a person’s vitamin status.
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Vitamin C (Ascorbic Acid)(p. 105)
Many functions Connective tissue: helps build strong tissues
through collagen synthesis General body metabolism: used by adrenals,
brain, kidney, liver, pancreas, thymus, spleen Antioxidant: similar to vitamin E
Requirements 75 mg/day for women, 90 mg/day for men;
increases for pregnant, lactating women, smokers
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Vitamin C Deficiency and Toxicity (p. 107)
Deficiency disease Tissue bleeding Bone fracture Scurvy
Toxicity symptoms Kidney stone formation GI disturbances Osmotic diarrhea
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Vitamin C Food Sources (p. 107)
Food sources Citrus fruits
Stability Quickly oxidized upon exposure to air and heat
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Thiamin (Vitamin B1) (p. 107)
Functions Gastrointestinal system Nervous system Cardiovascular system
Requirements: 1.2 mg/day for men, 1.1 for women Deficiency disease
Poor appetite, indigestion, constipation, Beriberi Toxicity symptoms: no evidence of toxicity Food sources: especially enriched grains Stability: fairly stable
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Riboflavin (Vitamin B2) (p. 109)
Functions Macronutrient metabolism to product ATP
Requirements Related to total energy requirements RDA for adults: 1.3 and 1.1 mg/day for men and
women, respectively Deficiency disease
Areas of the body with rapid cell regeneration (lips, mouth, tongue)
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Riboflavin (Vitamin B2) (cont’d) (p. 110)
Toxicity symptoms None reported
Food sources Most important is milk Enriched grains and animal protein
Stability Destroyed by light
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Niacin (Vitamin B3) (p. 110)
Functions Energy metabolism DNA repair
Requirements Depends of many factors 16 niacin equivalents/day for men, 14 for women
Deficiency disease Weakness, poor appetite, systemic symptoms Pellagra
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Niacin (Vitamin B3) (cont’d)(p. 111)
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Niacin (Vitamin B3) (cont’d)(p. 111)
Toxicity symptoms From supplements Skin flushing
Food sources Meat, poultry, fish, legumes Enriched grain products
Stability Lost in cooking water unless water is consumed
(soup)
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Vitamin B6 (Pyridoxine) (p. 111)
Functions Protein metabolism Neurotransmitter
Requirements Vary with protein intake 1.3 mg/day for men and women up to age 50
Deficiency disease Deficiency unlikely
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Vitamin B6 (Pyridoxine) (cont’d) (p. 112)
Toxicity symptoms From supplements Uncoordinated movement and nerve damage
Food sources Widespread in foods
Stability Stable to heat but sensitive to light and alkalis
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Folate (p. 112)
Functions DNA synthesis Regulation of blood homocysteine levels
Requirements 400 mcg/day
Deficiency diseases: Megaloblastic anemia Neural tube defects
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Folate (cont’d) (p. 114)
Toxicity symptoms None from intake of food
Food sources Widely distributed in foods, both naturally
occurring and fortified Stability
Easily destroyed by heat and leaches into cooking water
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Cobalamin (Vitamin B12) (p. 115)
Functions Regulation of blood homocysteine levels Heme synthesis DNA synthesis and cell division
Requirements Small amount usually met by diet
Deficiency disease Nonspecific symptoms Pernicious anemia
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Case Study (cont’d)
Is B12 deficiency a concern for Mr. Jones? Why or why not?
List three nutritional recommendations for Mr. Jones.
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Cobalamin (Vitamin B12) (cont’d) (p. 115)
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Cobalamin (Vitamin B12) (cont’d) (p. 116)
Toxicity symptoms None found
Food sources Bound to protein in foods
Stability Stable in ordinary cooking
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Pantothenic Acid (p. 116)
Functions Cellular metabolism Protein acetylation and protein acylation
Requirements No specific RDA
Deficiency disease: unlikely Toxicity symptoms: none observed Food sources: occurs widely in food Stability: stable to acid and heat but sensitive to
alkalis
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Biotin (p. 117)
Functions Coenzyme for carboxylases
Requirements: extremely small, 30 mcg/day Deficiency disease: no natural deficiency
known Toxicity symptoms: none known Food sources: widely distributed in natural
foods Stability: stable but water-soluble
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Choline (p. 118)
Data insufficient to determine its essentiality Functions
Structural integrity of cell membranes Neurotransmission
Requirements: 550 mg/day for men, 425 mg/day for women
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Choline (cont’d) (p. 118)
Deficiency disease: liver and muscle damage Toxicity symptoms: lowered blood pressure, fishy
body odor Food sources: occurs in a wide variety of foods Stability: relatively stable nutrient and water-soluble
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Phytochemicals (p. 118)
Bioactive molecules with health benefits Nonessential People eating whole fruits and vegetables benefitted
more than those who did not
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Phytochemical Functions (p. 120)
Function: wide variety Antioxidant function Hormonal actions Interactions with enzymes and DNA replication Antibacterial effects
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Phytochemical Intake (p. 120)
Recommended intake No established DRIs Consume a colorful variety of fruits, vegetables,
whole grains, nuts Food sources
Seven color categories
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Vitamin Supplementation (p. 120)
Definition Use is common in United States Only 3% to 4% of Americans eat according to
guidelines Recommendations for nutrient
supplementation Life cycle needs Pregnancy and lactation Infants, children, adolescents Older adults
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Case Study (cont’d)
Mr. Jones decides he would like to add supplements to ensure he is obtaining all essential nutrients. He has tripled his vitamin C intake along with extra doses of vitamin A and several of the B vitamins.
What guidance should be given to Mr. Jones?
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Vitamin Supplementation (cont’d) (p. 121)
Lifestyle Restricted diets: those following fad diets, vegans Smoking: reduces vitamin C pool Alcohol: can reduce absorption of B-complex
vitamins Disease: requires nutrition assessment
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Megadoses (p. 122)
Use of vitamins to: Alleviate illness Prevent disease Relieve symptoms
Potential toxicity
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Supplementation Principles(p. 122)
Read labels carefully Vitamins can be harmful in large amounts Professional should determine individual’s need All nutrients work together to promote good health Food is the best source of nutrients Evaluate the information
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Functional Foods (p. 124)
No legal definition Food that provides a health benefit beyond its basic
nutritional value American Dietetic Association recognizes possible
benefit Recommendations for intake not established
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