Monday, 11 July 2016

VITAMIN A FUNCTIONS AND DEFICIENCY

DEFINITION : Vitamin A can be defined as important organic substance needed in small quantities by the body for proper functioning of the body systems. This is a fat soluble vitamin.

 THE SOURCES OF VITAMIN A ANIMAL SOURCES 
 Fish, liver, oil, egg, milk, Butter, cheese and liver.

 THE PLANT SOURCES
Very green vegetables, palm oil, paw paw, carrots, mangoes, water melon, yellow corn, and tomatoes.  
DAILY REQUIREMENT OF VITAMIN A  Adult 

  •  5,000 international units. 
  • Children : 7,500 international units.
 THE STABILITY OF VITAMIN A 

 Vitamin A is not affected by normal cooking temperature, although long, slow cooking will destroy carotene which is the plant sources of vitamin A.

 FUNCTION OF VITAMIN A 
 • It controls the general state of the epithelial cell which reduces the risk of infection.
 • It is required for the regeneration of the visual purple in the retina of the eye so that rapid adaptation to dim light is possible.
 • It aids growth and development during childhood.
 • It helps to keep the cornea of the eyes in a healthy condition.

 DEFICIENCY OF VITAMIN A 
 • Night blindness which is the inability to see a dim light.
 • Keratomalacia which is the softening of the cornea which result in blindness.
 • Xerophthalmia which is drying and hardening of the cornea and conjunctiva .

 EFFECT OF EXCESS OF VITAMIN A 
 Hyervitaminosis of vitamin A might occur if additional vitamin A is taken in a medicine. In early life vitamin A affect skeletal growth and lead to softening and dailiness of the bone, patchy hair loss, drying and ulceration of the skin and sore lips.
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