Functions Of Vitamin A
- helping your body’s natural defence against illness and infection (the immune system) work properly
- helping vision in dim light
- keeping skin and the lining of some parts of the body, such as the nose, healthy
Vitamin A
Vitamin A also known as retinal has several important functions such as, eye normal function, skin normal function.
Vitamin A
How much vitamin A needed daily?
The total vitamin A content of a food is usually expressed as micrograms (µg) of retinol equivalents (RE).
The amount of vitamin A adults aged 19 to 64 need is:
• 700 µg a day for men
• 600 µg a day for women
Deficiency of vitamin A
1. Eye: a. Night blindness: impaired dark adaptation. b. Xero-ophthalmia: dryness and roughness of cornea and conjunctiva. 2. Growth retardation. 3. Skin and mucus membranes: a. Roughness of skin (goose skin). b. Roughness of mucus membranes of different body systems e.g. urinary system → infection.
Vitamin a
Excess vitamin A (overdose or hypervitaminosis A)
occurs when excessive vitamin A intake exceeds the capacity of RBP.
Free retinol will release in blood with the following toxic Effects:
Headache, nausea, bone pain and loss of hair.