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Vitamin A deficiency


Vitamin A is found in many animal products (butter, egg yolk, liver, fish), in plant foods contain carotene (provitamin A). Vitamin A is a fat-soluble. The daily requirement for an adult 1.5 mg (5000 ME).

Symptoms and flow. The first change of authorities: characterized by night, or "chicken" blindness due to degenerative changes of the retina and optic nerve, there is dryness of the conjunctiva, the deposition of the transparent plaque, ulcerated cornea. There have degenerative changes in the skin, mucous membranes and skin glands: dryness, peeling, and skin pallor, atrophy of the sweat and sebaceous glands and the tendency to pustular diseases. There are infections of the respiratory system, urinary, digestive, general malaise, weakness in children - delayed growth and development, disorders of the nervous system.

Recognition is based on medical history and clinical picture in the biochemical study of serum levels of vitamin A decreases below 100 g / l, carotene - below 200 g / l.

Treatment. Good nutrition with the inclusion of foods rich in carotene and retinol: meat, dairy foods, carrots, tomatoes, apricots. Can assign retinol adult in a daily dose of from 10,000 to 100,000 IU / day for 2-4 weeks. Large doses can cause beskontrolnoelechenie and hypervitaminosis A.