春天气候多变,会直接影响呼吸道粘膜的防御功能,全身的抗病能力也会下降;另一万面,各种细菌、病毒也开始大量繁殖,体质不佳时病菌、病毒等就会乘虚而入。有关资料表明,儿童体内缺乏维生素A是患呼吸道疾病的一大诱因。首都儿科研究所营养室的专家强调,缺乏维生素A就容易患呼吸道和消化道感染,一旦感冒或腹泻,体内维生素A的水平又会进一步下降。维生素A缺乏还会降低人体的抗体反应,导致免疫功能下降。维生素A对呼 Spring climate change, will directly affect the respiratory mucosal defense function, the body’s resistance to disease will decline; the other 10,000, a variety of bacteria, the virus also began to multiply, poor health when bacteria, viruses and so on will take advantage of Into. Information shows that lack of vitamin A in children is a major cause of respiratory disease. Capital Institute of Pediatrics nutrition room experts stressed that lack of vitamin A is susceptible to respiratory and gastrointestinal infections, once the flu or diarrhea, the body’s vitamin A levels will decline further. Vitamin A deficiency can also reduce the body’s antibody response, resulting in decreased immune function. Vitamin A call