讲营养关键是平衡问题。平衡膳食就是每天膳食中所供给的营养素要和身体的消耗保持相对平衡的一种膳食,唯有这种膳食才能保证身体正常生长发育和维持最佳的健康状态。当前,人民生活水平不断提高。但营养状况并不乐观,青少年中营养不良问题普遍存在,其原因不是膳食中缺乏营养素,而是饮食结构不当,导致营养摄入失调。举例如下:杭州朝鸣小学三年级男学生黄刚,父母均为个体户,家庭经济条件好,但家长不懂合理膳食,常给小孩买单一的高 The key to nutrition is to balance the problem. Balanced diet is the daily diet nutrients and the body to maintain a relatively balanced consumption of a diet, the only meal in order to ensure normal body growth and development and maintain optimal health status. At present, people’s living standards are constantly improving. However, the nutritional status is not optimistic. The problem of malnutrition in adolescents is widespread. The reason is not the lack of nutrients in the diet, but the improper diet, leading to imbalance in nutrient intake. Examples are as follows: Huang Ming, a third-grade male student of Hangzhou Chaoyang Primary School, both parents are self-employed and their families have good economic conditions. However, parents do not know a reasonable diet and often give children a single high