the water-soluble vitamins: b vitamins and vitamin c
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The Water-Soluble Vitamins: B Vitamins and Vitamin C. Chapter 10. Strawberries. Pork!. Vitamins Overview. Support nutritional health Vitamins differ from macronutrients Structure Vitamins are individual unlinked molecules Function No energy yielded, necessary in enzyme rxn’s - PowerPoint PPT PresentationTRANSCRIPT
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The Water-Soluble The Water-Soluble Vitamins: B Vitamins Vitamins: B Vitamins
and Vitamin Cand Vitamin CChapter 10
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StrawberriesStrawberries
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Pork!Pork!
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Vitamins OverviewVitamins Overview Support nutritional health Vitamins differ from macronutrients
StructureVitamins are individual unlinked molecules
FunctionNo energy yielded, necessary in enzyme rxn’s
Amount neededMeasured in micrograms not grams
Similar to macronutrients- vital to life, organic
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Vitamins at WorkVitamins at Work
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Vitamins OverviewVitamins Overview
Bioavailability NOT just quantity provided by food Amount absorbed and used by body Factors influencing bioavailability
Efficiency of digestion, transit timeNutrition status, current storesMethod of food preparationSource of nutrient- fortified vs. naturalOther foods consumed at same time
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Vitamins OverviewVitamins Overview
Precursors, aka Provitamins Can be converted to active form in body Ex: beta carotene to Vitamin A
Organic nature Can be destroyed during storage and in cooking
Heat UV Oxygen Soaking / Dilution
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Vitamins OverviewVitamins Overview
Solubility Affects absorption, transport, and excretion Water-soluble vitamins
Move directly into bloodMost travel freely
Fat-soluble vitaminsEnter lymph and then bloodRequire transport proteins
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Vitamins OverviewVitamins Overview
Consumption frequency of B vitamins & C Uptake relative to vitamin stores Toxicity More is not necessarily better Excessive intakes
Risks with levels higher than UL
See “In Summary” for overview section
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Bet
ter
Bet
ter
Bet
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More More MoreAs you progress in the direction of more, the effect gets better and better, with no end in sight (real life is seldom, if ever, like this).
As you progress in the direction of more, the effect reaches a maximum and then a plateau, becoming no better with higher doses.
As you progress in the direction of more, the effect reaches an optimum at some intermediate dose and then declines, showing that more is better up to a point and then harmful. That too much can be as harmful as too little represents the situation with most nutrients.
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Bet
ter
More
How it is with VitaminsHow it is with Vitamins
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The B Vitamins – As The B Vitamins – As IndividualsIndividuals
Vitamins do not directly provide the body with fuel for energy
Coenzymes Assist enzymes with release of energy
Without coenzyme, an enzyme cannot function
B vitamins form integral part of coenzymesDeficiencies disrupt metabolism
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The B Vitamins – As The B Vitamins – As IndividualsIndividuals
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Enzyme
Active site
Compounds CD
AB
Active site
Enzyme
Without coenzymes, compounds A, B, and CD don’t respond to their enzymes.
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Enzyme
CDA
Enzyme
Vitamin
B
With the coenzymes in place, compounds are attracted to their sites on the enzymes . . .
Coenzyme
Vitamin Coenzyme
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Enzyme
Enzyme
. . . and the reactions proceed instantaneously. The coenzymes often donate or accept electrons, atoms, or groups of atoms.
CD
A B
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Enzyme
Enzyme
C D
A B
The reactions are completed with either the formation of a new product, AB, or the breaking apart of a compound into two new products, C and D, and the release of energy.
New products
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Coenzyme animation 10.2
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The B Vitamin Thiamin
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Thiamin B1Thiamin B1
Part of coenzyme thiamin pyrophosphate (TPP) Energy metabolism
In conversion of pyruvate to acetyl CoA
TCA cycle conversion of acetyl CoA to succinyl CoA
Nerve activity and muscle activity
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Pyruvate reacts with Thiamin di-Pyruvate reacts with Thiamin di-POPO44
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Thiamin Thiamin inin TPP TPP
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Thiamin B1Thiamin B1 Deficiency- malnourished / alcoholics EtOH impairs absorption, displaces food, causes
urinary loss Beriberi- refined, unenriched rice
Dry – nervous system, muscle weaknessWet – CVS damage, overworked blood vessels
and kidneys retaining salt and water
No toxicity- excess wasted in urine No adverse effects
No UL
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Beriberi EdemaBeriberi Edema
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Thiamin B1Thiamin B1
Food sources: pork, soy milk, enriched grain foods
Prolonged cooking destroys thiamin Leaches into water when boiling or
blanching foods Cooking methods that conserve thiamin
Steam Microwave
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Fig. 10-4, p. 317
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The B Vitamin Riboflavin B2The B Vitamin Riboflavin B2
Serves as coenzyme in energy metabolism Flavin mononucleotide (FMN) Flavin adenine dinucleotide (FAD)
Recommendations Deficiency
Inflammation of membranes Toxicity
No UL
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Riboflavin part of Coenzyme Riboflavin part of Coenzyme FADFAD
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FAD
FADH2 carries the hydrogens to the electron transport chain. At the end of the electron transport chain, the hydrogens are accepted by oxygen, creating water, and FADH2 becomes FAD again. For every FADH2 that passes through the electron transport chain, 2 ATP are generated.
During the TCA cycle, compounds release hydrogens, and the riboflavin coenzyme FAD picks up two of them. As it accepts two hydrogens, FAD becomes FADH2.
FADH2
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Riboflavin B2Riboflavin B2
Deficiency- usually accompanies other deficiencies Inflammation of membranes of eyes, mouth, skin,
GI tract No toxicity- excess wasted in urine No adverse effects
No UL
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Riboflavin B2Riboflavin B2
Food sources Liver, clams, eggs, mushrooms Milk and milk products Enriched grain foods
Destruction of riboflavin Ultraviolet light Irradiation Not destroyed by cooking
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Riboflavin B2 SourcesRiboflavin B2 Sources
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The B Vitamin Niacin B3The B Vitamin Niacin B3
Has two chemical structures Nicotinic acid Nicotinamide
Major form of niacin in blood
Two coenzyme forms – metabolic reactions Nicotinamide adenine dinucleotide (NAD)
Carries hydrogens and their electrons NADP (the phosphate form)
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Niacin formsNiacin forms
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Niacin B3Niacin B3 Recommendations
Body can manufacture from tryptophanOnly occurs after protein synthesis needs
have been met. RDA is stated in niacin equivalents
60 tryptophan make 1 niacin
Deficiency Pellagra
Diarrhea, dermatitis, dementia, death Noted in low-protein, corn-based diet
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Pellagra dermatitis– Niacin Pellagra dermatitis– Niacin DeficiencyDeficiency
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Niacin B3Niacin B3
Recommendations Adequate intake (AI)
Prescription megadose to lower LDL, raise HDL and adiponectin
Toxicity with some diagnoses No UL for general population Large dose (3-4x RDA) causes “niacin flush”
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Niacin B3Niacin B3
Food sources Chicken breast, canned tuna, liver, ground
beef, peanut butter, enriched grain foods Less vulnerable to food preparation losses Mg per serving refer to pre-formed niacin
not equivalents
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Niacin B3 SourcesNiacin B3 Sources
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BiotinBiotin
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The B Vitamin BiotinThe B Vitamin Biotin
Coenzyme that carries activated carbon dioxide Critical in TCA cycle
Delivers carbon to pyruvate to form oxaloacetate
Participates in gluconeogenesis and fatty acid synthesis
Participates in breakdown of fatty acids and amino acids
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Biotin and CO2Biotin and CO2
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BiotinBiotin
Food sources: liver, egg yolks, soy, fish, also produced by GI tract bacteria
Deficiency: depression, lethargy, numbness in extremities, red, scaly facial rash
No toxicity
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Pantothenic AcidPantothenic Acid
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Pantothenic Acid in CoAPantothenic Acid in CoA
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The B Vitamin Pantothenic The B Vitamin Pantothenic AcidAcid
Deficiency Rare- involves general failure of all body’s
sysems No toxicity No UL Food sources- chicken, beef, potatoes,
oats, tomatoes, liver
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B6 (Pyridoxine) B6 (Pyridoxine)
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Vitamin BVitamin B66
Three forms Pyridoxal, pyridoxine, and pyridoxamine Conversion to coenzyme PLP
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Vitamin BVitamin B66
Functions Amino acid metabolism Fatty acid metabolism Urea metabolism Conversion of tryptophan to niacin or serotonin Synthesis of heme, nucleic acids,
neurotransmitters & lecithin
Stored exclusively in muscle tissue
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Vitamin BVitamin B66
Recommendations Large doses can be beneficial
Deficiency Depression, confusion, convulsions Alcohol destroys B6
Toxicity from 20x UL Irreversible nerve degeneration
Food sources
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Vitamin BVitamin B66
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The B Vitamin FolateThe B Vitamin Folate
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FolateFolate Known as folacin or folic acid Primary coenzyme form – THF
(tetrahydrofolate) Transfers single-carbon compounds during
metabolismConvert vitamin B12 to coenzyme form
Synthesizes DNA
Regenerates methionine from homocysteine
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Tetrahydrofolate (THF)Tetrahydrofolate (THF)
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In foods, folate naturally occurs as polyglutamate. (Folate occurs as monoglutamate in fortified foods and supplements.)
Spinach
Ring structure + Glutamate
Folate In the intestine, digestion breaks glutamates off... and adds a methyl group. Folate is absorbed and delivered to cells.
Intestine
In the cells, folate is trapped in its inactive form.
Cell
To activate folate, vitamin B12 removes and keeps the methyl group, which activates vitamin B12.
Both the folate coenzyme and the vitamin B12 coenzyme are now active and available for DNA synthesis. DNA
FFOOLLAATTEE
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FolateFolate Folate disposal
Secretion by liver into bileEnterohepatic circulation from SI to liverVulnerable to GI tract injuries and EtOH abuse Increased need for cell replication
Recommendations Bioavailability of folate
Synthetic form (pills) 1.7x more bioavailable than food sources
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Absorbing FolateAbsorbing Folate
Is natural always better?
E:\Media\Animations\chapter10\10ht4.html
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FolateFolate
Neural tube defects Supplement use by all women of child-
bearing age for prevention1 month before conceptionThrough first trimester
Folate fortification required in grain products Congenital birth defects- cleft lip and palate
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Spina Bifida Neural Tube Defect
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Cleft PalateCleft Palate
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FolateFolate Heart disease
Role of folate- break down homocysteine, reduce blood clots and atherosclerotic lesions
Risk for heart attacks, stroke, or death from cardiovascular causes?
Cancer Type of cancer Timing of supplementation
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Folate and HomocysteineFolate and Homocysteine
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FolateFolate Deficiency
Impairs cell division and protein synthesis Red blood cells and GI tract cells falter
Macrocytic anemia GI tract deterioration
Primary deficiencies Secondary deficiencies
Drugs
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Folate and DNA / CancerFolate and DNA / Cancer
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Folate and DNA / CancerFolate and DNA / Cancer
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How “Chemo” worksHow “Chemo” works
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FolateFolate Toxicity
Not from food sources Fortified foods or supplements UL has been established 1000 mcg/d
Excess intake of fortified foods canmask a vitamin B12 deficiency
Food sources Heat and oxidation destroy 50% of folate
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FolateFolate
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B12 CobalaminB12 Cobalamin
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Vitamin BVitamin B1212
Vitamin B12 and folate interdependent for activation Regeneration of methionine, synthesis of
DNA, and synthesis of RNA
Individual roles of vitamin B12 Synthesis of new cells Maintains nerve cells Reform folate enzymes Breaks down some fatty and amino acids
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B12 and Folate togetherB12 and Folate together
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B12 lost without FolateB12 lost without Folate
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B12 Coenzyme FormsB12 Coenzyme Forms
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Vitamin BVitamin B1212
Digestion and absorption Stomach- HCl and pepsin release B12 from
food proteins Small intestine
B12 binds with Intrinsic factor Transported in blood by specific binding
proteins Enters enterohepatic pathway Deficiency is rare except for vegans
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Vitamin BVitamin B1212
Recommendations (RDA) Deficiency caused by
Inadequate absorption Vegan diets Lack of hydrochloric acid or intrinsic factor
Name of deficiency: Pernicious anemia Can be tied to folate deficiency anemia Symptoms- anorexia, sore tongue,
constipation, fatigue, eventual paralysis
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Normal blood cells. The size, shape, and color of these red blood cells show that they are normal.
Blood cells in pernicious anemia (megaloblastic). These megaloblastic blood cells are slightly larger than normal red blood cells, and their shapes are irregular.
Vitamin BVitamin B1212
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Vitamin BVitamin B1212
Toxicity No adverse effects, no UL
Food sources Found exclusively in animal products
Fish, meat, eggs, milk and fortified foods
Destruction by microwaving
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Vitamin-Like CompoundsVitamin-Like Compounds Choline
Manufactured from methionine in body Conditionally essential nutrient Adequate intake (AI) not RDA
Common sources- milk, liver, eggs, peanuts Deficiencies are rare Roles in the body
Synthesis of acetylcholine and lecithin Toxicity- sweating, low blood pressure,
reduced growth rate, liver damage
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Vitamin Like CompoundsVitamin Like Compounds
Inositol Made from glucose Part of cell membrane structures
Carnitine Transports long-chain fatty acids for oxidation
Both can be made by body No recommendations established
Both are widespread in foods
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The B Vitamins in ConcertThe B Vitamins in Concert
Each B vitamin coenzyme is involved in energy metabolism directly or indirectly Facilitate energy-releasing reactions Build new cells to deliver O2 and nutrients (DNA)
Deficiencies B-vitamin deficiency seldom shows up in
isolation Ex: alcohol and drug abuse, polypharmacy
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B6, B12, and FolateB6, B12, and Folate
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AnemiaAnemia
Is it iron, B12 or folate?
E:\Media\Animations\chapter10\10ht5.html10ht5.html
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The B Vitamins In ConcertThe B Vitamins In Concert
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A healthy tongue has a rough and somewhat bumpy surface.
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In a B vitamin deficiency, the tongue becomes smooth and swollen due to atrophy of the tissue (glossitis).
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In a B vitamin deficiency, the corners of the mouth become irritated and inflamed (cheilosis).
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The B Vitamins in ConcertThe B Vitamins in Concert
Toxicities possible from oversupplementation Excess eliminated through urine excretion Homeostasis disruption
Food sources first choice Grains- B1, B2, B3, folate Fruits/vegetables- folate Meat group- B1, B3, B6, B12 Milk group- B2, B12
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Vitamin CVitamin C
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Photomicrograph of Vitamin CPhotomicrograph of Vitamin C
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Vitamin C – Roles Vitamin C – Roles
Antioxidant Defends against free radicals
Loses electrons easily Vitamin C recycling Protects tissues from oxidative stress
Disease prevention Enhances iron absorption
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Vitamin C as Antioxidant
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Vitamin C as Antioxidant
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Ascorbic acid protects against oxidative damage by donating its two hydrogens with their electrons to free radicals (molecules with unpaired electrons). In doing so, ascorbic acid becomes dehydroascorbic acid.
Dehydroascorbic acid can readily accept hydrogens to become ascorbic acid. The reversibility of this reaction is key to vitamin C’s role as an antioxidant.
Vitamin C Vitamin C
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Vitamin CVitamin C
Cofactor in collagen formation Matrix for bone and tooth formation Conversion of proline to hydroxyproline
Cofactor in other reactions Hydroxylation of carnitine Conversion of tryptophan to serotonin Conversion of tyrosine to norepinephrine Making hormones
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Vitamin CVitamin C
In stress Adrenal glands release vitamin C and
hormones into blood Types of stress that increase vitamin C
Prevention and treatment of common cold Conflicting and controversial research Deactivates histamine
Disease prevention
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Vitamin C – Vitamin C – Recommendations Recommendations
Prevent overt symptoms of scurvy
Absorption maximum 200 mg
Higher vitamin C levels for smokers
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Vitamin C Deficiency Vitamin C Deficiency
Notable signs of deficiency Gums bleed easily around teeth Capillaries under skin break spontaneously
Scurvy Other physical signs Psychological signs Sudden death
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Vitamin C – Deficiency Vitamin C – Deficiency
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Vitamin C – Toxicity Vitamin C – Toxicity
Supplementation side effects Diarrhea GI distress
UL Interference with medical regimens Medical conditions in which high doses of
vitamin C should not be consumed
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Vitamin C Food SourcesVitamin C Food Sources
Fruits and vegetables Potatoes (red potatoes more)
Vulnerable to heat and oxygen Used as antioxidant by food manufacturers
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Vitamin C Food SourcesVitamin C Food Sources
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Relation between plasma ascorbic Relation between plasma ascorbic acid and mortality in men and women acid and mortality in men and women in EPIC population study: European in EPIC population study: European
Prospective Investigation into Cancer Prospective Investigation into Cancer and Nutrition.and Nutrition.
Lancet. 2001 Mar 3;357(9257):657-63. Khaw KT, Bingham S, Welch A, Luben R,
Wareham N, Oakes S, Day N. Department of Public Health and Primary
Care, Institute of Public Health, University of Cambridge School of Clinical Medicine, UK. [email protected]
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Abstract BackgroundAbstract Background Ascorbic acid (vitamin C) might be protective
for several chronic diseases. However, findings from prospective studies that relate ascorbic acid to cardiovascular disease or cancer are not consistent. We aimed to assess the relation between plasma ascorbic acid and subsequent mortality due to all causes, cardiovascular disease, ischaemic heart disease, and cancer.
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METHODSMETHODS
We prospectively examined for 4 years the relation between plasma ascorbic acid concentrations and mortality due to all causes, and to cardiovascular disease, ischaemic heart disease, and cancer in 19 496 men and women aged 45-79 years.
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METHODSMETHODS
Participants completed a health and lifestyle questionnaire and were examined at a clinic visit. They were followed-up for causes of death for about 4 years. Individuals were divided into sex-specific quintiles of plasma ascorbic acid. We used the Cox proportional hazard model to determine the effect of ascorbic acid and other risk factors on mortality.
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FINDINGS FINDINGS
Plasma ascorbic acid concentration was inversely related to mortality from all-causes, and from cardiovascular disease, and ischaemic heart disease in men and women. Risk of mortality in the top ascorbic acid quintile was about half the risk in the lowest quintile (p<0.0001). The relation with mortality was continuous through the whole distribution of ascorbic acid concentrations.
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FINDINGS FINDINGS
20 micromol/L rise in plasma ascorbic acid concentration, equivalent to about 50 g per day increase in fruit and vegetable intake, was associated with about a 20% reduction in risk of all-cause mortality (p<0.0001), independent of age, systolic blood pressure, blood cholesterol, cigarette smoking habit, diabetes, and supplement use. Ascorbic acid was inversely related to cancer mortality in men but not women.
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Highlight 10Highlight 10
Vitamin and Mineral Supplements
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Vitamin and Mineral Vitamin and Mineral SupplementsSupplements
Taken as dietary insurance Costly but harmless practice
Mostly self-prescribed Physician recommendation increasing Improving food choices is preferred course
of action
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Arguments for SupplementsArguments for Supplements
Correct overt deficiencies Therapeutic doses prescribed by physician
Acting as drug
Support increased nutrient needs Certain stages of life
Improve nutrition status Improve body defenses Reduce disease risks
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Who Needs Supplements?Who Needs Supplements?
Specific nutrient deficiencies
Low energy intakes Vegans and older
adults with atrophic gastritis
Lactose intolerance GI diseases Certain medications
Certain stages of life cycle
Inadequate milk intake, sun exposure, or dark skin
Medical conditions that interfere with nutrients in body
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Arguments Against Arguments Against SupplementsSupplements
Toxicity Supplement users are more likely to have
excessive intakes Issues with children
Life-threatening misinformation No guarantee of supplement effectiveness
Unknown needs “Ideal” supplements
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Arguments Against Arguments Against SupplementsSupplements
False sense of security Other invalid reasons
Today’s health problemsOvernutritionPoor lifestyle choices
Bioavailability and antagonistic actions Nutrients may interfere with one another’s
actionMake dietary modifications first
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Selection of SupplementsSelection of Supplements
Follow directions carefully Single, balanced vitamin-mineral
supplement U.S. Pharmacopeia (USP) logo
Logo assurances Two basic questions
Form Contents
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Misleading ClaimsMisleading Claims
Organic or natural vitamins High potency claims Marketing strategy
“New” vitamins “Green” pills Stress relief
Internet advertising Cost
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Regulation of Regulation of SupplementsSupplements
Food and Drug Administration (FDA) Dietary Supplement Health and Education
Act of 1994 Enable consumers to make informed choices Same general labeling requirements as
foods Net effect: deregulation of supplement
industry