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目的：研究中学生饮食习惯及肥胖的变化。方法：测量身高，体重，而后计算身体质量指数（BMI），结果：RMI在民族、城乡，性别间未发现有意义的差别。城市组内BMI高中生比初中生增高显著，高中女生比初中女生增高显著，过低体重，肥胖的比例在民族，城乡和性别间无差异，前者在初中生中所占比例较高中生为高。结论：青少年的体重变化与民族，城乡，性别间未发现存在一定的关系，但在初高中生之间则显示出差异。
Objective: To study the changes of middle school students’ eating habits and obesity. Methods: Height and weight were measured, and then body mass index (BMI) was calculated. As a result, no significant difference was found in ethnicity, urban and rural areas and gender among RMIs. The urban group BMI high school students increased significantly higher than junior high school students, girls in high school than junior high school girls increased significantly lower body weight, obesity in nationality, urban and rural areas and no difference between the gender, the former accounted for a high proportion of junior high school students are high . Conclusion: There is not a certain relationship between body weight change among ethnic groups, urban and rural areas and between sexes. However, there is a difference between junior and senior high school students.