This study was carried out to evaluate the associations between lifestyles and Body Mass Index in a group of 807 male and 363 female university students, ages 17 to 29 years.
17.0% of male students and 5.8% of female students showed the overweight in the classification of obesity by Japan Society for Study of Obesity.
There was no statistically significance in the comparison of the body height, body weight, body mass index, obesity index and body fat(%) according to grade in male students. And male students showed increasing tendency of waist-hip-ratio according to grade. In female, freshman showed the highest values of body weight, body mass index, obesity index and body fat(%).
According to obesity category, there was significant difference in the comparison of body weight, body mass index, obesity index, waist-hip ratio and body fat(%), but except body height.
Body mass index was positively correlated to waist-hip ratio(r = 0.4612, P = 0.0001), fat(%)(r = 0.4346, P = 0.0001), and height(r = -0.0872, P = 0.0132), in males and waist-hip ratio (r = 0.3514, P = 0.001), fat(%)(r = 0.3827, P = 0.001), age(r = -0.1159, P = 0.0272), and height(r = -0.1413, P = 0.0070), in females.
This study provides an opportunity to further examine the relationship of sociodemographic factors and health behaviors to obesity, and to suggest the basic concept to match the obesity study to general epidemiological cohort studies for controlling of chronic adult diseases.

Keywords: Obesity, Lifestyle, BMI(Body Mass Index), Body fat, WHR(Waist-hip-ratio), Height, Weight