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一般由食品所摄入的维生素量是不会发生维生素过剩的。但常因错误地使用药物和用维生素强化食品而导致维生素过剩乃至中毒。一、主要的维生素过剩症1.维生素A(V_A):V_A的生理作用除参与视网膜杆状细胞感光外,还与皮肤粘膜的生成过程及维持机体细胞膜的稳定性有关。成人摄入12,000 IU/kg以上时,出现急性中毒;连续摄入4,000 IU/kg出现慢性中毒。急性中毒时,因颅内压增高而出现头痛、呕吐;慢性中
The amount of vitamins usually consumed by food is not excessive vitamin. But often because of the wrong use of drugs and vitamins fortified foods and lead to excess vitamins and even poisoning. First, the main symptoms of vitamin 1 vitamin A (V_A): V_A physiological role in addition to involvement of retinal rod-like cells, but also with the formation of skin and mucous membranes and maintain the stability of the cell membrane. Acute poisoning occurs when adults consume more than 12,000 IU / kg; chronic poisoning occurs when 4,000 IU / kg is ingested continuously. Acute poisoning, due to increased intracranial pressure and headache, vomiting; chronic