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Chapter 6 Power Point
1.
Chapter 6 Lecture Chapter
6: Vitamins: Micronutrients with Macro Powers © 2016 Pearson Education, Inc.
2.
Learning Outcomes 1. Compare
and contrast fat-soluble and water- soluble vitamins. 2. Explain the role of vitamin A in vision and cell differentiation, and its relationship to beta- carotene. 3. Identify the primary functions and food sources of vitamins D and K. 4. Discuss the process of oxidation and explain how it can damage cells. © 2016 Pearson Education, Inc.
3.
Learning Outcomes 5. Discuss
the interrelated roles of vitamins E and C in protecting cells from oxidation. 6. Explain how our body uses the B vitamins to generate energy. 7. Discuss the importance of adequate folate intake for women of childbearing age. © 2016 Pearson Education, Inc.
4.
Learning Outcomes 8. Describe
the interrelationship of vitamin B6, folate, and vitamin B12 in homocysteine metabolism and cardiovascular disease. 9. Explain how dietary supplements are regulated in the United States, and the recommendations for and against their use. 10.Discuss the three stages of cancer progression and the role of dietary factors in influencing cancer risk. © 2016 Pearson Education, Inc.
5.
What Are Vitamins? •
Vitamins • Classified as micronutrients • Contain carbon • Essential in regulating multiple body processes • May be fat-soluble • May be water-soluble © 2016 Pearson Education, Inc.
6.
What Are Vitamins? ©
2016 Pearson Education, Inc.
7.
Fat-Soluble Vitamins • Vitamins
A, D, E and K • Are dissolvable in fat • Are absorbed in the intestine along with dietary fat • Can be stored in the body © 2016 Pearson Education, Inc.
8.
Fat-Soluble Vitamins • Can
build up to toxic levels • Megadosing of A and D can lead to death. • Are found in fatty foods • Diet needs to contain the average amount required over a period of time © 2016 Pearson Education, Inc.
9.
Fat-Soluble Vitamins © 2016
Pearson Education, Inc.
10.
Fat-Soluble Vitamins © 2016
Pearson Education, Inc.
11.
Water-Soluble Vitamins • Vitamin
C and the B-vitamins group • Can be dissolved in water • Are absorbed easily through the intestinal wall • Can't be stored in large amounts in the body © 2016 Pearson Education, Inc.
12.
Water-Soluble Vitamins • Rarely
accumulate to toxic levels from diet alone • Supplements can lead to toxicity. • Should consume adequate amounts on a regular basis © 2016 Pearson Education, Inc.
13.
Water-Soluble Vitamins © 2016
Pearson Education, Inc.
14.
Water-Soluble Vitamins © 2016
Pearson Education, Inc.
15.
Preserving Vitamins • Vitamins
can be destroyed by: • Water • Heat • Light • Air • pH disturbances © 2016 Pearson Education, Inc.
16.
Vitamin A Protects
Our Sight • Vitamin A is a fat-soluble vitamin. • The active form of vitamin A is retinol, found in the retina of the eye. • Vitamin A is critical to maintaining healthy vision. © 2016 Pearson Education, Inc.
17.
Vitamin A Protects
Our Sight © 2016 Pearson Education, Inc.
18.
Vitamin A Protects
Our Sight © 2016 Pearson Education, Inc. Click on the Vitamin a Visual Cycle link separate from the power point.
19.
Vitamin A Protects
Our Sight • Functions of vitamin A • Essential for healthy vision • Cell differentiation: the process by which cells mature and specialize • Development of T lymphocytes of the immune system • Sperm production and fertilization • Bone growth © 2016 Pearson Education, Inc.
20.
Vitamin A Protects
Our Sight © 2016 Pearson Education, Inc. Click on the Vitamin a Epithelial link separate from the power point.
21.
What Is the
Role of Beta-carotene? • Beta-carotene is: • in the class of chemicals called carotenoids • a provitamin • Provitamins are inactive precursors that must be converted to active forms in the body. • Beta-carotene is the precursor of retinol. © 2016 Pearson Education, Inc.
22.
What Is the
Role of Beta-carotene? • Carotenoids like Beta-carotene are known to: • protect cell membranes against damage • enhance the immune system • protect skin from damage by UV light • protect eyes from damage © 2016 Pearson Education, Inc.
23.
Vitamin A Protects
Our Sight • Recommended intake • RDA is 900 micrograms/day for men; 700 micrograms/day for women. • Sources of vitamin A • Obtained from animal sources (liver, eggs) and plant sources (dark green, orange, and deep yellow fruits and vegetables) © 2016 Pearson Education, Inc.
24.
Vitamin A Protects
Our Sight © 2016 Pearson Education, Inc.
25.
Vitamin A Toxicity •
Vitamin A is highly toxic, especially from single-nutrient supplements. • Birth defects and permanent damage to the liver and eyes can result. © 2016 Pearson Education, Inc.
26.
Vitamin A Deficiency •
Night blindness is the most common symptom of vitamin A deficiency. • Other symptoms include: • Impaired immunity • Stunted bone growth • Reproductive system disorders • Increased risk for illness and infections • Blindness © 2016 Pearson Education, Inc.
27.
Vitamin D Guards
Our Bones • Vitamin D • is a fat-soluble vitamin • can be synthesized by the body with exposure to UV light from the sun • is a hormone since it is synthesized in one location and acts in another location © 2016 Pearson Education, Inc.
28.
Vitamin D Guards
Our Bones © 2016 Pearson Education, Inc. Click on the Activation Vitamin D link separate from the power point.
29.
Vitamin D Guards
Our Bones • Functions of vitamin D • Required for calcium and phosphorus absorption • Regulates blood calcium levels • Necessary for bone calcification © 2016 Pearson Education, Inc.
30.
Vitamin D Guards
Our Bones • Recommended intake • There is no RDA for vitamin D. • AI values range from 5 to 15 µg/day depending on age and gender. • AI values assume that a person's sun exposure is inadequate. • Extreme northern and southern latitudes receive inadequate sun in the winter. • Vitamin D synthesis is decreased in older adults and people with highly pigmented skin. © 2016 Pearson Education, Inc.
31.
Vitamin D Guards
Our Bones • Sources of vitamin D • Most foods naturally contain very little vitamin D. • Most vitamin D is obtained from fortified foods such as milk. • Vegetarians not consuming dairy foods receive vitamin D from the sun, fortified soy products, and/or supplements. © 2016 Pearson Education, Inc.
32.
Vitamin D Guards
Our Bones © 2016 Pearson Education, Inc.
33.
Vitamin D Guards
Our Bones • What if you consume too much vitamin D? • Can occur from vitamin supplements • Results in high blood calcium levels • What if you don't consume enough vitamin D? • Rickets: occurs in children • Osteomalacia (soft bones): occurs in adults © 2016 Pearson Education, Inc.
34.
Vitamin K Protects
Against Blood Loss • Vitamin K • is a fat-soluble vitamin stored in the liver • is required for blood coagulation • is a coenzyme: a compound that combines with an inactive enzyme to activate the enzyme © 2016 Pearson Education, Inc.
35.
Vitamin K: A
Coenzyme © 2016 Pearson Education, Inc.
36.
Vitamin K Protects
Against Blood Loss • Recommended intake • There is no RDA for vitamin K. • AI values are 120 µg/day for men and 90 µg/day for women. • Sources of vitamin K • Green leafy vegetables, soybean and canola oils; also produced by intestinal bacteria © 2016 Pearson Education, Inc.
37.
Vitamin K Protects
Against Blood Loss © 2016 Pearson Education, Inc.
38.
Vitamin K Protects
Against Blood Loss • What if you consume too much vitamin K? • No known side effects from large quantities • What if you don't consume enough vitamin K? • Reduced blood clotting, excessive bleeding • Can occur with diseases that disturb absorption of fat in the small intestine © 2016 Pearson Education, Inc.
39.
What Are Antioxidants? •
Many metabolic processes involve oxidation reactions and can produce harmful free radicals. • Antioxidants: chemicals that protect cells against damage from oxidation, including: • Vitamins E and C © 2016 Pearson Education, Inc.
40.
Free Radical Formation ©
2016 Pearson Education, Inc. Click on the Free Radical Formation link separate from the power point.
41.
Formation of Free
Radicals © 2016 Pearson Education, Inc.
42.
Formation of Free
Radicals • Free radicals are highly unstable atoms. • Produced by oxidation reactions in cells • Also produced by pollution, ultraviolet light, and toxic substances • Free radicals cause damage to: • cell membranes • low-density lipoproteins (LDLs) • cell proteins • genetic material (DNA) • Antioxidants work to stabilize free radicals. © 2016 Pearson Education, Inc.
43.
Vitamin E Maintains
Healthy Cells • Vitamin E: • is a fat-soluble vitamin stored in fat tissue and cell membranes • protects against free radical damage • protects LDLs, red blood cells, and cells lining the lungs • is critical for development of muscles and nerves © 2016 Pearson Education, Inc.
44.
Vitamin E Maintains
Healthy Cells • Recommended intake • 15 mg per day • Sources of vitamin E • Vegetable oils, nuts, seeds, wheat germ, soybeans © 2016 Pearson Education, Inc.
45.
Vitamin E Maintains
Healthy Cells © 2016 Pearson Education, Inc.
46.
Vitamin E Maintains
Healthy Cells • What if you consume too much vitamin E? • Vitamin E toxicity is uncommon. • What if you don't consume enough vitamin E? • Vitamin E deficiencies are uncommon. • Can result in ruptured red blood cells, leading to anemia © 2016 Pearson Education, Inc.
47.
Vitamin C Protects
Cells and Tissues • Chemical name is ascorbic acid • Functions of vitamin C: • Antioxidant • Re-energizes vitamin E • Protects against airborne pollutants • Synthesizes collagen • Prevents the disease scurvy • Enhances the immune system • Enhances absorption of iron © 2016 Pearson Education, Inc.
48.
Vitamin C Protects
Cells and Tissues • Recommended intake • 90 mg/day for men; 75 mg/day for women • Smokers need an extra 35 mg/day. • Sources of vitamin C • Fresh fruits and vegetables • Cooking destroys the vitamin C. © 2016 Pearson Education, Inc.
49.
Vitamin C Protects
Cells and Tissues © 2016 Pearson Education, Inc.
50.
Vitamin C Protects
Cells and Tissues • What if you consume too much vitamin C? • Megadoses of vitamin C can cause nausea, diarrhea, and nosebleeds. • What if you don't consume enough vitamin C? • Scurvy is the most common vitamin C deficiency disease. • Bleeding gums, loose teeth, weakness © 2016 Pearson Education, Inc.
51.
B-Vitamins: The Energy
Generators • B-vitamins: • are water-soluble vitamins • are especially important for energy metabolism • do not contain energy, but act as coenzymes to help release energy from carbohydrates, fats, and proteins © 2016 Pearson Education, Inc.
52.
B-Vitamins: The Energy
Generators • The B-vitamins are: Thiamin (B1) Folate Riboflavin (B2) Vitamin B12 Niacin Pantothenic acid Vitamin B6 Biotin © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators • Thiamin (vitamin B1) • Coenzyme required for carbohydrate metabolism • Coenzyme for the metabolism of some amino acids • Enriched foods and whole grains are good sources. • Beriberi: deficiency of thiamin resulting in muscle wasting and nerve damage © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators • Riboflavin (vitamin B2) • Part of coenzymes involved in protecting against oxidation damage • Good sources of riboflavin include egg yolks, milk, enriched grain products. • Ariboflavinosis: riboflavin deficiency; sore throat, swollen mucous membranes © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators • Niacin • Coenzyme assisting with metabolism of carbohydrates and fatty acids • Good sources: meat, fish, poultry, enriched bread products • Toxicity can result from supplements. • Pellagra: severe niacin deficiency © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators • Vitamin B6 (pyridoxine) • Part of a coenzyme for more than 100 enzymes in protein metabolism • Good sources: enriched cereals, liver, fish, poultry, starchy vegetables • Toxicity from supplements can result in nerve damage, skin lesions. • Deficiency may increase homocysteine in the blood. © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators • Folate • Involved in DNA synthesis and amino acid metabolism • Critical for cell division of very early embryos • Good sources: ready-to-eat cereals, enriched bread products • Toxicity can mask vitamin B12 deficiency. © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators • Vitamin B12 (cobalamin) • Part of coenzymes for blood formation • Required for nerve functioning • Required for homocysteine breakdown • Found only in animal-based foods • Deficiency results in low energy, fatigue, shortness of breath. • Pernicious anemia: B12 deficiency © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators © 2016 Pearson Education, Inc. Click on the Vitamin B12 link separate from the power point.
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B-Vitamins: The Energy
Generators © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators • Pantothenic acid • Component of coenzymes for fatty acid metabolism • Required for building new fatty acids • Good sources: chicken, beef, egg yolks, potatoes, oat cereals, tomato products • No toxicity from excess pantothenic acid • Deficiencies are very rare. © 2016 Pearson Education, Inc.
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B-Vitamins: The Energy
Generators • Biotin • Part of coenzymes involved in metabolism of carbohydrates, fat, and proteins • Important for gluconeogenesis • Biotin content has been determined for very few foods. • Biotin deficiencies are rare. © 2016 Pearson Education, Inc.
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Choline • Choline is
a vitamin-like substance. • Assists in homocysteine metabolism • Accelerates the synthesis of acetylcholine, a neurotransmitter • Good sources: milk, liver, eggs, peanuts • Deficiency can lead to liver damage. • Toxicity can result from supplements. © 2016 Pearson Education, Inc.
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Dietary Supplements • Are
not strictly regulated • Who might benefit from vitamin/mineral supplementation? • When can taking a vitamin/mineral supplement be harmful? © 2016 Pearson Education, Inc.
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Cancer • Cancer: a
group of related diseases characterized by cells that grow out of control. • Composed of three steps: • Initiation • Promotion • Progression © 2016 Pearson Education, Inc.
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Cancer • Factors that
increase cancer risk include: • tobacco use • sun exposure • nutrition • environmental/occupational exposure • low level of physical activity © 2016 Pearson Education, Inc.
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Cancer © 2016 Pearson
Education, Inc.
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Cancer © 2016 Pearson
Education, Inc.
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Cancer © 2016 Pearson
Education, Inc.
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Cancer • Antioxidants from
whole foods may contribute to reducing the risk of cancer. • Antioxidants from whole foods may work by: • enhancing the immune system • inhibiting growth of cancer cells • preventing oxidation damage to cells © 2016 Pearson Education, Inc.
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Cancer • Phytochemicals • Naturally
occurring chemicals in plants • May reduce the risk of cancer, heart disease, and stroke by reducing damage from free radicals • Found in fruits, vegetables, whole grains, legumes, nuts, garlic, onion, soy products © 2016 Pearson Education, Inc.
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Cancer © 2016 Pearson
Education, Inc. Video will be shown on next slide.
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