Diploma in Hospitality Management
Nutrition Lecture Seven
Fat Soluble Vitamins
Fat soluble Vitamins
Molecules that the body cannot make itself
dissolve in fat
must consume in/with fat
Need to as to both take part in metabloism and to act as hormones
Role of Fat Soluble Vitamins
These vitamins have a more direct role in metabolism than the Water Soluble Vitamins
- Need to roles like hormones eg Vit A, D
- Needed for involvement in physiological functions Vit E, K
Vitamin D Function
- Need to allow Calcium uptake
- stimulates production of Calcium Binding Proteins (CBP)
- this allows uptake of calcium from the gut , bone and urine
- but Vitamin D has to be activated before it can work
- Vit D works together with Parathyroid Hormone (PTH)
- Too little Vit D causes extra PTH
- PTH is a vasoactive and
cuauses blood vessels to constrict and High blood pressure
Deficiencies
Rickets
Infants
very bad in china still
Osteomalacia
Adults
Osteoporosis
Older adults
hypertension
Effects every one
More in higher latitudes where less sun
more important than too much salt
Source of Vitamin D
- Made in the Skin form Cholesterol
- need UV light
- more deficiency in higher latitudes
- (Victoria. > Queensland)
- Vit. D3 made in skin (Called pro Vit D)
- Must be oxidised in Lung then Kidney to produce Active Vit. D ( DHCC)
Excess
food supplantation
Vitamin A (Retinol)
Needed to form Visual purple in the retina of eye
Hormonal action
regulates cell differentiation
Immune system
Blood cells
skin
hair
Embryonic development
Cancer
Deficiencies
Deficiency permanently blinds some 250,000 children a year.
Infectious Childhood illnesses, contributing to 30% of the deaths of under 5 yo.s
Vitamin A supplementation could prevent 1 to 3 million child deaths each year .
Blindness linked with diarrhoea
- The lack of vitamin A not only of blindness,
- It also results in diarrhoea and other infections.
- These repeated attacks of diarrhoea may bring about the final eye damage which destroys sight.
Sources of Vitamin A
beta - carotene
Converted into Vit A
Liver, eggs, butter margarines, fish oil
Green and red vegetables
Vitamin E
- Natural Anti-oxidant
- Stops production of Free Radicles
- Free radicles react with many compounds
- DNA ->> mutations
- Fats ->> membrane fracture
- Ageing
Source of Vitamin E
wheatgerm
Unprocessed vegetable oils
nuts
green vegetables
Vitamin K
- Need for blood clotting
- formation of prothrombin
- Source
- Fats and Oils
- vegetables
- Intestinal bacteria
The End
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