VITAMIN A

Vitamin A 

Vitamin A is a fat-soluble vitamin, and is vitamins are essential for the maintenance of health and survival. 

Vitamin A is an important nutrient for humans, because the substance These nutrients are not made ​​by the body, so must be met from outside the body in the form of food 

the dikonsums. Vitamin A is a vitamin that works well for the growth of cells - cells epithelium, and as a regulator of neuronal sensitivity to light stimuli and eye. 

Benefits of Vitamin A 

a. vision 

Vitamin A functions in normal vision in dim light. when us from the bright light outside and then entered a dimly lit room light, then the speed of the eyes to adapt after being exposed to bright light directly related to vitamin A, which is available in the blood. Sign the first vitamin A deficiency is night blindness. Supplementation of vitamin A can improve vision is less when it is caused due to deficiency vitamin A. 

b. Growth and Development 

Vitamin A is needed for bone development and epithelial cells email form in the dentition. In vitamin A deficiency, stunted bone growth and abnormal bone shape. In children - children the lack of vitamin A, there is a failure in its growth. where Vitamin A in this case acts as retinoic acid. 

c. reproduction 

Formation of sperm in males and eggs and cell formation fetal development in the womb of vitamin A in the form retinol. Females with low vitamin A status will be able to get pregnant but miscarriage or difficulty in childbirth. The ability of retinoids influence the development of epithelial cells and the ability to increase the activity thought to affect the immune system in the prevention of skin cancer, throat, lung, breast and bladder. 

d. Immune function 

Vitamin A effect on immune function in humans. Where vitamin A deficiency can decrease antibody response relies on a lymphocytes that play a role in a person's body immunity. 

Sources of Vitamin A

Vitamin A carotenoids are found in a wide variety of foods. meat red heart, milk, full cream, cheese, butter is a food that is high retinol. Vegetables and fruits such as green and yellow carrots, green vegetables such as 

cassava leaves, bean leaves, kale, spinach, beans, peas, tomatoes, yellow corn, papaya, mango, ripe jackfruit, oranges, peaches, apricots and vegetable oils, palm oil is red is food high carotene.

Signs and Symptoms of Vitamin A deficiency

Vitamin A deficiency is common in children under five. Disorders of the eye may occur in several stages, depending on the severity of vitamin A deficiency, disruption of the ability to adapt and see in the dark, xerophthalmia, and eventually blindness can occur. Early corneas affected by vitamin A deficiency gland water the eye is not capable of causing tears drying on the membrane covering the cornea with a sign blurring. Coating corneal epithelial cells can result in the softening and eventual rupture that causes total blindness. Some signs and symptoms of vitamin A deficiency is if fatigue very, anemia, skin becomes dry, itchy and rough. In the hair may occur dryness and hair and nail growth disorders.

Due to Lack of Vitamin A

Vitamin A also acts as an antioxidant that can get rid of free radicals contained in the fatty membrane into sections smaller. Primary cause is deficiency of vitamin A and vitamin A formation in setting the daily diet. The cause is the occurrence of secondary failure in the use of vitamin A