Vitamin E, C, K, and the B complex vitamins have important roles in human health. Vitamin E is a family of antioxidants that protects cell membranes and LDL from oxidation. Vitamin C aids in collagen synthesis and is important for tissue repair. Vitamin K is required for blood clotting and bone mineralization. The B vitamins function as coenzymes in energy production and amino acid metabolism. Deficiencies can result in diseases like scurvy, beriberi, and megaloblastic anemia.
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www.indiandentalacademy.com
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http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
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ESC Beyond Borders _From EU to You_ InfoPack general.pdf
vitamines.ppt
1. VITAMIN E
The term vitamin E describes a family
of 8 antioxidants,
4 tocopherols (a,b, g, & d) and
4 tocotrienols.
a-tocopherol is the active form of
vitamin E in the human body.
2. FUNCTIONS
• The main function of vitamin E is anti
oxidant. It intercepts free radicals &
prevents destruction of cell membrane.
• It protects the fat in LDL from oxidation.
• It inhibits platelets aggregation.
• It enhances vasodilatation.
• It inhibits the activity of protein kinase C.
4. Vitamin E deficiency
•Severe vitamin E deficiency causes:
Neurological symptoms (impaired
coordination) & muscle weakness.
Increased risk of cardiovascular
diseases
Hemolytic anemia in children
6. THERAPEUTIC USES
Prevention of cardiovascular diseases
Diabetes Mellitus
Cancer prevention
Boost immunity
Dementia
7. TOXICITY
Excess vitamin E may cause:
Impaired blood clotting leading to
increased risk of bleeding in some persons.
It is recommended that vitamin E
supplements to be stopped one month
before elective surgery.
8. VITAMIN K
The K is derived from the German word
Koagulation.
There are 2 naturally occurring forms of
vitamin K. Plants synthesize phylloquinone
(vitamin K1) & bacteria synthesize
menaquinone-3 (vit K2).
Menaquinone-4 is produced in animals from
vit K1, but its function is yet to be discovered.
9. FUNCTIONS
•Vitamin K is needed for production of
vitamin K-dependent coagulation factors in
the liver.
•Other functions include:
Assist in bone mineralization. The
mineral binding capacity of osteocalcin
requires vit K.
Gas6 is vit K-dependent protein
identified in 1993. It is important for
neuronal function.
10. SOURCES OF VITAMIN K
Bacteria in large intestine produce vit
K2 and supply 40-50% of human
requirement.
Vegetable oils
Almonds & peanuts
Avocado & Broccoli
Spinach, Lettuce, parsley (raw)
11. Vitamin K deficiency
Is uncommon in adults. Only those with
severe liver disease & those on oral
anticoagulants are at risk.
Exclusively breast fed & premature babies
are at risk coz human milk is low in vitamin E
& their gut is not yet colonized with bacteria.
Hemorrhagic disease of the newborn is a
serious threat to life & routine vit k
prophylaxis is recommended by the AAP.
13. VITAMIN C
Humans, unlike other mammals, are
unable to make ascorbic acid & they get it
from food.
Rich dietary sources are citrus juices
(orange, grapefruit & lime), strawberry,
Guava, tomato, sweet red pepper & broccoli.
Recommended daily intake is between
15-120 mg/day depending on age. Smokers
& lactating mother needs the higher range.
14. FUNCTIONS
Collagen synthesis
Antioxidant
Synthesize of noradrenaline
Carnitine synthesize
Metabolism of cholesterol to bile salts
15. Vitamin C deficiency
Severe deficiency leads to Scurvy with the
following manifestations:
Bleeding & bruising easily
Hair & teeth loss
Joint pain & swelling
Fatigue & lack of concentration
17. DRUG INTERACTIONS
• Contraceptive pills & aspirin lower
vitamin C level in plasma & WBC.
• Vitamin C in large dose blocks the action
of warfarin & interferes with
interpretation of certain lab tests
(bilirubin & creatinine in serum and
guaiac assay for occult blood).
• Previous claims of serious toxic effects
of vit C are not evidence-based.
19. VITAMIN B Complex
Group of 7 water soluble vitamins, thiamin,
riboflavin, niacin, pyridoxine, cobalamin,
biotin & pantothenic acid.
Biotin & pantothenic acid deficiencies are
extremely rare coz it is found in numerous
foods and also is synthesized by intestinal
bacteria.
Biotin deficiency may occur with prolonged
antibiotic therapy & ingestion of raw eggs.
21. THIAMIN (VIT B1)
Thiamin is rapidly converted to its active
form, thiamin pyrophosphate in the brain and
liver by a specific enzymes, thiamin
diphosphotransferase.
TPP is necessary as a cofactor for the
reactions of the pentose phosphate pathway.
The dietary requirement for thiamin is
proportional to the caloric intake of the diet
and ranges from 1.0 - 1.5 mg/day for normal
adults.
22. RISK OF THIAMIN DEFICIENCY
Low intake & alcoholism
Increased consumption: Malaria & AIDS
Excessive loss: hemodialysis and diuretics
Anti-thiamin factors: tea & coffee.
Thiaminases found in raw fish, raw shellfish
& in silkworms.
23. DEFICIENCY & USES
Severe thiamin deficiency can lead to:
Beri-Beri
Wernicke-Korsakoff syndrome
Thiamin is used for treatment of
congestive heart failure & Alzheimer's
disease as well as in cancer prevention.
24. RIBOFLAVIN (VIT B2)
Adequate amounts of B2 is present in eggs,
milk, meat & cereals. Deficiency is often seen
in chronic alcoholics due to their poor dietetic
habits.
Symptoms associated with riboflavin
deficiency include, glossitis, seborrhea,
angular stomatitis, cheilosis and photophobia.
Riboflavin decomposes when exposed to
visible light. This characteristic can lead to
riboflavin deficiencies in newborns treated by
phototherapy.
25. NIACIN (VIT B3)
Niacin is available in both animal & plant
food and is made in the body from
tryptophane.
Severe deficiency causes pellagra with
glossitis, dermatitis, diarrhea, depression and
dementia.
Hartnup disease, malignant carcinoid
syndrome & Isoniazid can lead to niacin
deficiency .
In large doses niacin lowers plasma
cholesterol but it elevates blood glucose &
uric acid levels, so it is not recommended
with diabetes & gout.
27. PYRIDOXINE (VIT B6)
Pyridoxine functions as a cofactor in
enzymes reactions required for the
synthesis & catabolism of the amino acids
as well as in glycogenolysis.
Widely available in diet & deficiency
may follow INH & pencillamine therapy.
Deficiency can cause neonatal seizures,
cheilosis, glossitis & neuroitis.
28. COBALOMIN (VIT B12)
B12 functions as a cofactor for enzymes
required for the catabolism of fatty acids &
the conversion of homocysteine to
methionine.
B12 is not available in plant & deficiency
may occur in strict vegetarians & in pts
with GIT problems & those on prolonged
antibiotic treatment.
Deficiency causes megaloblastic
anemia, SACDC, & high homocysteine in
blood which is a risk of IHD & stroke.
29. FOLIC ACID
Folic acid is obtained from yeasts and leafy
vegetables as well as animal liver. Animals can’t
synthesize folate, thus, it must come from diet.
Folate is needed for synthesis of nucleic
acids
Deficiency causes megaloblastic anemia &
neural tube defects in utero.
Used for treatment of chronic hemolytic
anemia.