Vitamin,Nutrition,Poison,Whent health Vitamin A: Nutrition or Poison
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Whentalking about vitamin A, the first thing we mention probably is the relevant deficiency disease. But recently, expertsbegin to worry that whether too much amount of this vitamin will become apoison. Scientific results tell us that ordinary diet will not lead to it.Lacking of vitamin A is one of the four deficiencydiseases in the world. This vitamin is a necessary organic compound for normalvital activities. Its amount in the human body is quite tiny. But it plays avery important role in metabolism and growth. There arefour functions of this type of vitamin. The first is to maintain theintegrality of mucous layer. Or it will lead to keratosis. The second function is to compose the photoactive substances inthe visual cells. Otherwise, the adaptation of the eyes would be worse. Andsometimes patients would even suffer from nyctotphlosis.Another function is to promote the growth and procreation. And the last is toimprove immunity. Lackingof vitamin A in the world can lead to a death of one million to 2.5 million. Ahalf million children under the school age would become blind every yearbecause of this reason. A four-month-long investigation about it in China revealed that 11.7% of children in China lackedthis vitamin. This problem in China,especially the western China,is quite severe. In developed countries, clinical cases are much fewer but thesituation is also worrying. However,we should keep in mind that vitamin is water-soluble or fat-soluble. When thereis too much in the human body, the water-soluble vitamin will not affect thebody but the fat-soluble vitamin will be stored in the fat and become apoison. Vitamin A belongs to thefat-soluble type, storing in the liver. Excessive vitamin A can causepoisoning. Usualdiet and nutrient fortified foodgenerally would not lead to poisoning. Almost all the poisoning is eating toomuch by accident. As early as the 1590s, pathfinders in the arctic pole ate theliver of polar bears, which contained a large amount of vitamin A, had thesymptoms o headache, vomit and somnolence. Once a 19-year-old man atehalf a kilo of dog livers and was poisoned by vitamin A. Later, he was advisednot to livers for half a year. Too much amount will destroy the cells andbones. So if excessive vitamin A is ingested by pregnant women, it will evenlead to congenital malformation.
Vitamin,Nutrition,Poison,Whent