water soluble vitamins and minerals - dr.parvathy
DESCRIPTION
for medical studentsTRANSCRIPT
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The Water Soluble Vitamins & Trace elements
Dr.Parvathy
Dept. of Pathology
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B Complex Primary Functions
Energy metabolismThiamin (B-1), Riboflavin (B-2), Niacin (B-
3), Pyridoxine (B-6), Biotin, Pantothenic Acid
Red blood cell synthesisFolate, B12
Homocysteine metabolismFolate, B12, B6
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Enrichment Act of 1941 and 1998
Many nutrients lost through milling process of grains
Grain/cereal products are enriched
Thiamin, riboflavin, niacin, folate, iron
Whole grains contain original nutrients
Enriched grains still deficient in B-6, magnesium and zinc
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Thiamin (B1)
Thiamine Functions:Synthesis of ATPCo-factor in pentose phosphate
pathwayMaintains neural membranes and
conduction
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Deficiency of ThiaminOccurs where polished rice is the only staple
Chronic alcoholics
Little stored in body, so alcoholic binge of 1-2 weeks may result in deficiency
Pernicious vomiting or diarrhea• Wernicke-Korsikof f Syndrome
– Wernicke encephalopathy• Korsakoff’s psychosis• Result of thiamine deficiency caused by alcoholism
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Beriberi (I can’t I can’t)Weakness, nerve degeneration, irritability,
poor arm/leg coordination, loss of nerve transmission
Edema, enlarged heart, heart failureSymptoms due to poor metabolism of
glucoseDepression and weakness can be seen after
only 10 days on a thiamin-free diet
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Wet and Dry BeriBeri
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Food Sources of ThiaminGreen beans, milk, orange juice, organ meats, peanuts, dried beans and seed
Enriched breads and grains/ whole grains
Thiaminase found in
raw fish Destroys thiamin
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RDA For Thiamin
1.1 mg/day for women1.2 mg/day for menSurplus is rapidly lost in urine; non toxic; no Upper Level
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Riboflavin (B2)
Riboflavin is a critical component of flavin mononucleotide (FMN) & flavin dinucleotide (FAD) which participate in redox reactions
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Ariboflavinosis
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Food Sources of Riboflavin
Milk/productsEnriched grainsReady to eat cerealsLiverVegetables (asparagus,
broccoli, greens)Sensitive to uv radiation
(sunlight)Stored in paper, opaque plastic containers
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RDA for Riboflavin
1.1 mg/day for women
1.3 mg/day for men
Average intake is above RDA
Toxicity not documented
No upper level
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Niacin (B3)
Nicotinic acid and nicotinamide
Essential component of NAD & NADP which play central roles in cellular intermediate metabolism. Synthetic pathways require niacin, especially fatty acid synthesis
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Deficiency of Niacin: Pellagra3 Ds
Dermatitis - which most often occurs in sun exposed areas of face and upper extremity
Dementia - results from neuronal degeneration in the brain and spinal column
Diarrhea - is associated with edema and inflammation of the intestinal submucosa.Poor appetite, weight loss, weakness
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Pellagra
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Food Sources of NiacinEnriched grains, ready to eat cerealsBeef, chicken, turkey, fish peanutsHeat stable; little cooking
loss
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RDA for Niacin14 (mg) NE/day for women
16 (mg) NE/day for men
Upper Level is 35 mg
Other names
Nicotinic acid, Nicotinamide, Niacinamide,Vitamin B3
Precursor: dietary tryptophan(60mg=1mg)
Toxicity S/S: headache, itching, flushing, liver and GI damage
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Pantothenic Acid/ Vit B5
Part of Coenzyme-AEssential for metabolism of CHO, fat, protein
Deficiency rareNo known toxicity
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Food Sources of Pantothenic acid
“From every side”
Meat
Milk
Mushroom
Liver
Peanut
Eggs
Adequate Intake= 5 mg/day
Daily Value 10 mg
Average intake meets AI
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Biotin
Free and bound form
Metabolism of CHO and fat
Assists the addition of CO2 to other compounds
Synthesis of glucose, fatty acids, DNA
Help break down certain amino acids
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Biotin DeficiencyRaw egg whites avidin bind biotin → deficiencyRequires large amountScaly inflamed skin, tongue, and lip changesPoor appetite, nausea, vomitingAnemiaMuscle pain and weaknessPoor growth
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Food Sources of Biotin
Cauliflower, yolk, liver,
peanuts, cheese
Intestinal synthesis of
biotin
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Biotin Needs
Adequate Intake is 30 ug/day for adults
Deficiency rare
No Upper Level for biotin
Relatively nontoxic
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Pyridoxine (B6)
Coenzyme
Activate enzymes needed for metabolism of CHO, fat , protein
Synthesize nonessential amino acid via transamination
Synthesize neurotransmitters
Synthesize hemoglobin and WBC
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Pyridoxine/B6 Deficiency
Widespread symptoms• Depression• Vomiting• Scaly dermatitis• Nerve irritation• Impaired immune system
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Food Sources of Vitamin B-6
Well absorbed• Meat, fish, poultry• Enriched cereals• Potatoes• MilkLess well absorbed• Fruits and vegetables: Banana, spinachHeat and alkaline sensitive
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B6 Toxicity
Nerve damage
Difficulty walkingNumbness in hands/feetCan lead to irreversible nerve damage with > 200 mg/dayUpper Level set at 100 mg/day
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RDA for Vitamin B-6
1.3 mg/day for adults
1.7 mg/day for men over 50
1.5 mg/day for women over 50
Average intake is more than the RDA
Athletes may need more
Alcohol destroys vitamin B6
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Folate
Part of coenzymes THF (tetrahydrofolate) and DHF (dihydrofolate) used in DNA synthesis and therefore important in new cell formation-Anticancer drug methotrexate
Homocysteine metabolismNeurotransmitter formation
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Deficiency of Folate
Similar signs and symptoms of vitamin B-12 deficiency
Anemia
Pregnant women
Alcoholics
Megaloblastic Anemia
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Neural Tube Defects
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Food Sources of FolateLiver
Fortified breakfast cereals
Grains, legumes
Foliage vegetables
Susceptible to heat,
oxidation, ultraviolet light
Synthetic form better
absorbed
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RDA for Folate
400 ug/day for adults
(600 ug/day for pregnant women)
Excess can mask vitamin B-12 deficiency
Upper Level set at 1 mg
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Cobalamin/Vitamin B-12
Synthesized by bacteria, fungi, and other lower organisms
Role in folate metabolism
Maintenance of the myelin sheaths
RBC formation
Part of coenzymes methylcobalamin and deoxyadenosylcobalamin used in new cell synthesis
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Absorption requires
HCl
Pepsin
Intrinsic factorDifficult for vegetarians to obtainPernicious anemia
Nerve degeneration, weakness Tingling/numbness in the extremities (parasthesia) Paralysis and death Looks like folate deficiency
Usually (95%) due to decreased absorption ability
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Vitamin B12 deficiency
Diagnosis: Schilling test
Treatment: 1000mg Vitamin B12 IM daily for two weeks and monthly injections for life
High Risk: African Americans, northern Europeans, elderly
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Food Sources of Vitamin B-12
Synthesized by bacteria, fungi and algae
Animal products, meat
Seafood
Eggs
Milk
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RDA for Vitamin B-12
2.4 ug/ day for adults and elderly adults
B-12 stored in the liver
Non-toxic (no Upper Level)
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Vitamin C
Synthesized by most animals (not by humans)Decrease absorption with high intakesExcess excreted
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Functions of Vitamin C
Reducing agent (antioxidant)Iron absorption (enhances)Synthesis of collagenImmune functionsWound healing
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Antioxidant
Can donate and accept hydrogen atoms readilyWater-solubleNeeds are higher for smokersMay prevent certain cancers (esophageal, oral, stomach cancer, cardiovascular disease, cataracts)
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Vitamin C Deficiency: History of Scurvy
Sailors on long sea voyages suffered horribly from scurvyOn Vasco da Gama's voyage to the East Indies in 1497, 100 out of 160 men were lost from the disease.
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Scurvy in the British Royal Navy
James Lind published his Treatise on the Scurvy in 1754. Lime juice was made mandatory on British Navy sailing ships 40 years later
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Deficiency of Vitamin CScurvyDeficient diet for 20-40 days Fatigue, pinpoint hemorrhagesBleeding gums and joints. HemorrhagesAssociated with poverty; macrobiotic diet
Rebound ScurvySudden halt to high levels of vitamin C
supplements
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ScurvyScorbutic Rosary
Follicular Hemorrhages
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Food Sources of Vitamin C
Citrus fruit
Potato
Green pepper
Cauliflower
Broccoli
Strawberry
Spinach
Easily lost through cooking
Sensitive to heat
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RDA for Vitamin C
90 mg/day for male adults
75 mg/day for female adults
+35 mg/day for smokers
Upper Level is 2 g/day
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Vitamin C Excess
Hemochromatosis
Oxalate kidney stones
Erodes tooth enamel
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Choline
Newest essential nutrient
Grouped with B group vitamins
All tissues contain choline
Precursor for acetylcholine (neurotransmitter)and phospholipids
Some role in homocysteine metabolism
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Food Sources of Choline
Widely distributed
Milk
Liver
Eggs
Peanuts
Lecithin added to food
Deficiency rare
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Trace Elements
Essential Trace Elements:
iron, zinc, copper, cobalt, chromium, fluorine, iodine, manganese,
molybdenum and selenium
Probably essential:
nickel, tin, vanadium, silicon, boron
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Copper
Metabolism• Copper circulates bound to
ceruloplasmin
• Excretion occurs via transport of copper into bile and elimination in feces
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cofactor for many cuproenzymes including:cofactor for many cuproenzymes including:
•Cu, Zn-superoxide dismutase (antioxidant)Cu, Zn-superoxide dismutase (antioxidant)•Cytochrome C oxidase (ATP synthesis, neurologic Cytochrome C oxidase (ATP synthesis, neurologic function)function)•Ceruloplasmin (6 atoms per molecule)Ceruloplasmin (6 atoms per molecule)•Lysyl oxidase (cross links and stabilizes connective Lysyl oxidase (cross links and stabilizes connective tissue proteins)tissue proteins)•Tyrosinase (melanin synthesis)Tyrosinase (melanin synthesis)
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Copper Physiology/DeficiencyCopper Physiology/Deficiency• Acquired deficiency is rareAcquired deficiency is rare
• Manifestations:Manifestations: Hypochromic microcytic anemiaHypochromic microcytic anemia NeutropeniaNeutropenia Hypopigmentation of hair and skinHypopigmentation of hair and skin Structural abnormalities in connective tissueStructural abnormalities in connective tissue Fetal and neonatal deprivation leads to Fetal and neonatal deprivation leads to
neurologic dysfunctionneurologic dysfunction Reduced levels of circulating copper and Reduced levels of circulating copper and
ceruloplasminceruloplasmin
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Food Sources
organ meats, seafood, nuts, seeds, cereals, whole grains, cocoa
Inborn Errors of Copper Metabolism:Inborn Errors of Copper Metabolism:
Wilson’s Disease (Hepatolenticular Wilson’s Disease (Hepatolenticular Degeneration)Degeneration)
Menkes Kinky Hair SyndromeMenkes Kinky Hair Syndrome
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Pili torti (Menkes Disease)
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Iodine
-body normally has 20-30 mg of iodine and more than 75% is in the thyroid gland
-the rest is in the mammary gland, gastric mucosa, and blood
-it’s only function is related to thyroid hormone
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Food Sources
foods of marine origin (seaweed), processed foods, iodized salt
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Deficiency-goiter—enlargement of the thyroid gland goitrogens -cabbage, turnips, peanuts, soybeans
-deficiency may be absolute—in areas of deficiency, or relative—adolescence, pregnancy, lactation
-goiters are more prevalent in women and with increased age
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Endemic Cretinism
severe deficiency during gestation and early postnatal growth: cretinism
(mental deficiency, spastic diplegia, quadriplegia, deaf mutism, dysarthria, shuffling gait, short stature, hypothyroidism)
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Iodine deficiency is the most Iodine deficiency is the most common nutrient deficiency common nutrient deficiency
in the world!in the world!
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Iodine Excess and ToxicityIodine Excess and Toxicity
Humans are remarkably tolerant to high iodine intakes
In iodine deficiency, repletion must be done slowly to prevent hyperthyroidism
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Goiter
Endemic to parts of
S. America and India
Sporadic cases in U.S.
Selenium deficiency
(needed to convert T4 to T3)
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Goiter - Complications
Usually asymptomaticAcute pain from thyroidal hemorrhageDysphagia Dyspnea
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ChromiumRegulation of glucose metabolism as a component of glucose tolerance factor (GTF).GTF increases effect of insulin (by facilitating its binding to cell receptor site).Chromium regulates plasma lipoprotein concentration.
Reduces serum cholesterol and serum triglycerides. Both chromium and Fe are carried by Tf, however albumin can also assume this role
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Food Sources
bread, meats, poultry, fish, beer
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Deficiencyaltered CHO metabolism, impaired glucose tolerance, glycosuria, fasting hyperglycemia, increased insulin levels and decreased insulin binding to receptors-impaired growth, peripheral neuropathy, negative nitrogen balance
Toxicitychronic renal failure
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Cobalt
-most stored with vitamin B12
-component of B12—cobalamin
-essential for maturation of RBC’s and normal function of all cells
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Deficiency
-**macrocytic anemia
Toxicitypolycythemia
-hyperplasia of BM
-reticulocytosis
-increased blood volume
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Selenium-glutathione peroxidase
• --overlaps with vit E for antioxidant effects• Iodothyronine 5’- deiodinase
• Thioredoxin reductase
• Epidemiologic evidence indicates low intakes of Se are associated with higher risk of prostate cancer
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Food SourcesFood Sources
Food content tends to follow Se content of soil – richest food sources are organ meats and sea foods, followed by cereals and grains, dairy products, fruits and vegetables
• Requirements determined based on serum glutathione peroxidase activity
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Selenium Deficiency DiseasesSelenium Deficiency Diseases
•Human deficiency is rare except in areas with low Se content in soil
Keshan disease occurs in Keshan China: endemic cardiomyopathy and muscle weakness (due to oxidized lipids)
Aggressive supplementation has eliminated disease
•Iatrogenic deficiency TPN without supplemental Se
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Selenium Toxicity
Acute-cardiorespiratory collapse (gram amounts)
Chronic (selenosis) -changes in nail structure and loss of hair (intakes ~6x UL)
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Molybdenum
-relationship with copper and sulfate-cofactor of many enzymes involved in the catabolism of sulfur AA, purines and pyridines-Toxicity: gout-like syndrome, reproductive SE’s-Deficiency: increased risk with co-existing copper deficiency, TPN
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Manganese •High concentration of Mn2+ is present in mitochondria• Functions as a necessary factor for activation of glycosyltransferases (enzymes responsible for the synthesis of oligosaccharides, glycoproteins, proteoglycans.• Required for superoxid dismutase activity, for activity of metalloenzymes:
hydrolaseskinasesdecarboxylasestransferases.
Deficiency of Mn extensively reduce glycoprotein and proteoglycan formation.
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Iron Adult human body contains 3-4 Gm 60-70% is present in Blood and rest in storage
form. Each Gm of Hb contains 3.34mg of Iron.
Requirement : 1 mg per day for Male 2.5 mg for Females 3.5 mg for Females in Physiological stress
conditions
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Sources of iron Haem Iron:
Liver, meat, poultry, Fish
Non Haem Iron: Cereals, GLV, Legumes,, Nuts, Oil seeds,
Dried Fruits, Jaggery
Factors interfere in absorption are enzymes in the food – Phytates, Oxalates, Phosphates, Dietary fibres
Ascorbic acid is the most potent enhancer iron
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Iron Deficiency Occurs in 3 stages: First Stage: Decreased storage without any
other detectable abnormalities Second Stage: stores are exhausted, serum
Ferritin level decreases. Third Stage: Decrease in Hemoglobin
percentage
Functional disturbances: decrease in resistance to infection, increase morbidity & mortality, decreased work performances, impaired cell mediated immunity
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Evaluation of iron status
1. Hemoglobin Concentration: relative index of iron deficiency. ( early Anemia if Hb is 10-11g% & marked anemia Hb is < 10g%).
2. Serum Iron concentration: useful index ( Normal 0.8 to 1.8mg /L)
3. Serum Ferritin level: Gold standard & sensitive tool for evaluation and reflects the size of the iron status ( < 10Micrgms/L)
4. Serum Transferrin Saturation: 16% - 30%
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Correction of Iron Deficiency
Oral iron supplements 100-200 mg elemental iron daily Higher doses are of no benefit Ferrous sulphate 65mg/tab Pregnant women- 100mg/tablet
(+ folic acid)
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Fluorine It is found in combined forms 96% of fluorides in the body found in bone and
teeth. An essential for normal mineralisation of bones
and formation of dental enamel
Source: Drinking water : Fluorine in the drinking water is
0.5 mg per ltr. Excess of fl > 3mg causes flourosis.
Foods: Sea fish, cheese, Tea It is a two edged sword ( deficiency or excess)
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Zinc Adult body contains 1.4 to 2.3 gms of Zinc Plasma level- 96Microgm per 100 ml ( adults), 89
Microgram per 100 ml (children)
Functions are Active role in metabolism of glucose and proteins Synthesis of insulin by pancreas Immunity functions
Food sources : meat, milk, fish Plant sources have low bioavailability
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Zinc deficiency 1. Growth failure2. Sexual infantilism in adolescents, loss of taste,
delayed wound healing, decrease in immunosynthesis.
3. Spontaneous abortions, stillbirths, congenital malformations, anencephaly
4. LBW, Intra Uterine deaths, premature labour.
5. Requirement is 15mg for men6. 12 mg for women, 10mg for children
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