中学生一般为12～18岁的青、少年.在这个时期,他们在生理和心理上都有一系列的变化.其特点为各种器官逐渐发育成熟,思想活跃,记忆力强,是一生中长身体、长知识的最重要时期.由于中学生生长发育旺盛,故对营养的要求高于成年人,否则,就会影响生长发育以及学习能力和劳动效果,因 Middle school students are generally 12 to 18 years of age, juvenile .In this period, they have a series of physiological and psychological changes, which is characterized by a variety of organs gradually mature, active thinking, memory, is a long body, The most important period of long knowledge.As the growth and development of secondary students strong, so the nutrition requirements higher than adults, otherwise, it will affect the growth and development as well as learning ability and labor effects, because