The purposes of this study were to study the behavior of products to reduce the weight of the students. And to learn factors that affect the decision to use products to reduce the weight of the students. School of Medicine at University of Phayao by using the query that the Investigator. Create your own. By the user to answer the questionnaire. Manually collect information from The Random Define the subject by using the table of the building block. เคซี่ and มอร์แกน determine the size of the population sample. The students School of Medicine at the branch Forum Health Promotion first-year 4 of 50 sample size is the same as the people, 44 And the analysis of the data with a percentage value The average standard deviation.Chi-square tests By using the Building Block.