We recruited volunteers among healthy medical students and
nurses aged 20-55 years in a university hospital in Seoul, Korea.
We excluded individuals who reported gaining or losing greater
than 5 percent of their body weight in the previous year, those
who reported major changes in their diets, and those who
started to take new drugs regularly during the previous year.
Participants were asked to complete an FFQ and a 3DDR,
followed by a second FFQ after 1 month. Of the 100 initial
participants, 18 subjects who did not complete the 3DDR or
first FFQ (FFQ1) were also excluded. In current analyses, we
included 82 participants (61 women, 21 men). Among them,
58 provided a second FFQ (FFQ2). The Institutional Review
Board of Konkuk University approved this study (No.2008-
25-52).