蛋白质－热能营养不良是因缺乏能量和／或蛋白质所致的一种营养缺乏症，是影响小儿健康和导致死亡的严重疾病之一，常有全身各组织器官不同程度的病理改变。本文就婴幼儿营养不良的生理生化改变、免疫功能进行了初步探讨，报告如下。１　对象与方法１．１对象和分组　营养不良 Protein - Heat malnutrition is a nutritional deficiency caused by a lack of energy and / or protein. It is one of the most serious diseases that affect children’s health and cause death. Often, pathological changes of tissues and organs of various tissues and organs are often observed. This article on the physiological and biochemical changes in infants and young children malnutrition, immune function were initially discussed, the report is as follows. 1 objects and methods 1.1 objects and groups malnutrition