Background : according to WHO (world health organization), in 2004, more than 1,9 billion teenagers and adults with overweight were found. Of all those 1,9 billion, more than 600 million teenagers and adults were obese. Overall, 13% of adult population (11% male and 15% female) were obese in the year of 2014. And in the same year, 39% of the ≥18 years old population (38% male, 40% female), were found with overweight. This study aims to assess the risk factors associated with overweight and obesity prevalence in UMY students Method : this is an observational analitic with cross sectional study design. Data were analyzed with bivariat test through 2x2 table chi-square test and multivariat test with logistic regression test. 1364 respondents were involved as sample. Result : The prevalence of overweight in UMY students were 14.4%, while the prevalence of obesity were 13.4%. according to the bivariat analysis test, samples of overweight were significantly associated with sweet dietary intake (p= 0.037), while the other variables : sex (p= 0.148), physical activity (p= 0.661), smoking habit (p=0.654), fatty dietary intake (p=0.644), and vegetables & fruits intake (0.753) were not significantly associated. In samples with obesity, significantly associated variables are sweet dietary intake (p=0.037) and fruit & vegetables (p= 0.280), physical activity (p= 0.885), smoking habit (p= 0.568), and fatty dietary intake (p= 0.095) ere not significantly associated. According to the result in multivariate test, in overweight samples, male gender and sweet intake (<once a day) altogether has p= 0.000, meanwhile, in samples with obesity, sweet dietary intake (<once a day), fatty dietary intake (<once a day), and fruit & vegetables consumption (<once a day), altogether shows p= 0.000 Conclusion : Overweight prevalence in UMY students is affected by the collaboration of male gender and sweet dietary intake (<once a day), working altogether. While the obesity prevalence in UMY students is affected by the collaboration of sweet dietary intake (<once a day), fatty dietary intake (<once a day), and fruit & vegetables consumption (<once a day), all working at the same time.