我们幼儿园在长期营养分析中发现,幼儿的膳食中最易缺乏的营养素是维生素A、胡萝卡素、钙和核黄素。而这些营养素对幼儿是十分重要的。缺乏维生素A会使上呼吸道的抵抗力降低而引起感染,并可引起干眼病、角膜软化、角膜溃疡,还会影响视力,产生夜盲症。胡萝卜素在人体肝或小肠内,经过酶的作用可变成维生素A,供人体利用。幼儿缺钙,会出现牙齿不齐,发育迟缓,严重的会得佝偻病或引起手足痉挛。缺乏核黄素(维生素B_2)常会发生口角炎、唇炎、角膜血管增生、巩膜出血等。为了防止上述营养素摄入量不 In our long-term nutritional analysis, our kindergarten found that the most vulnerable nutrients in young children’s diets are vitamin A, carprostcin, calcium and riboflavin. These nutrients are very important for young children. Lack of vitamin A will reduce the upper respiratory tract resistance caused by infection, and can cause dry eye, corneal softening, corneal ulceration, but also affect vision, resulting in night blindness. Carotene in the human liver or small intestine, after the enzyme can become the role of vitamin A, for human use. Children calcium deficiency, there will be missing teeth, stunted, severe rickets will cause or cause hand-foot cramps. Lack of riboflavin (vitamin B_2) often occur angular cheilitis, cheilitis, corneal vascular proliferation, scleral bleeding. In order to prevent the above nutrient intake does not