Subjects of this study were selected among adults participated in the 2007–2008 Korea National Health and Nutrition
Examination Survey (KNHANES), which was a cross-sectional and nationally representative survey. The design of KNHANES is described in detail elsewhere [5]. Out of 6084 individuals aged between 30 and 65 years, 1098 were excluded for missing information or implausible energy intake (5000 kcal) and 1115 were excluded due to a history or treatment of
diabetes, hypertension, or dyslipidemia to avoid the effects of preexisting disease condition. A total of 3871 individuals were
included in the final analysis.